United Airlines (UAL) 10-K 27 Feb 25 2024 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2024	Feb. 24, 2025	Jun. 28, 2024
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-06033
Entity Registrant Name	United Airlines Holdings, Inc.
Entity Address, Address Line One	233 South Wacker Drive,
Entity Address, City or Town	Chicago,
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	(872)
Local Phone Number	825-4000
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-2675207
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 15.9
Entity Common Stock, Shares Outstanding		327,339,564
Documents Incorporated by Reference	Certain information required by Items 10, 11, 12 and 13 of Part III of this Form 10-K is incorporated by reference for United Airlines Holdings, Inc. from its definitive proxy statement for its 2025 Annual Meeting of Stockholders.
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Fiscal Year Focus	2024
Entity Central Index Key	0000100517
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	UAL
Security Exchange Name	NASDAQ
Preferred Stock Purchase Rights
Document Information [Line Items]
Title of 12(b) Security	Preferred Stock Purchase Rights
United Airlines, Inc.
Document Information [Line Items]
Entity File Number	001-10323
Entity Registrant Name	United Airlines, Inc.
Entity Address, Address Line One	233 South Wacker Drive,
Entity Address, City or Town	Chicago,
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60606
City Area Code	(872)
Local Phone Number	825-4000
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	74-2099724
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1,000
Entity Central Index Key	0000319687

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2024
Audit Information [Abstract]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Chicago, Illinois

STATEMENTS OF CONSOLIDATED OPER

STATEMENTS OF CONSOLIDATED OPERATIONS (UAH) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating revenue:
Total operating revenue	$ 57,063	$ 53,717	$ 44,955
Operating expense:
Salaries and related costs	16,678	14,787	11,466
Aircraft fuel	11,756	12,651	13,113
Landing fees and other rent	3,437	3,076	2,576
Aircraft maintenance materials and outside repairs	3,063	2,736	2,153
Depreciation and amortization	2,928	2,671	2,456
Regional capacity purchase	2,516	2,400	2,299
Distribution expenses	2,231	1,977	1,535
Aircraft rent	193	197	252
Special charges	112	949	140
Other operating expenses	9,053	8,062	6,628
Total operating expense	51,967	49,506	42,618
Operating income	5,096	4,211	2,337
Nonoperating income (expense):
Interest expense	(1,629)	(1,956)	(1,778)
Interest income	726	827	298
Interest capitalized	227	182	105
Unrealized gains (losses) on investments, net	(199)	27	20
Miscellaneous, net	(53)	96	8
Total nonoperating expense, net	(928)	(824)	(1,347)
Income before income taxes	4,168	3,387	990
Income tax expense	1,019	769	253
Net income	$ 3,149	$ 2,618	$ 737
Earnings per share, basic (in dollars per share)	$ 9.58	$ 7.98	$ 2.26
Earnings per share, diluted (in dollars per share)	$ 9.45	$ 7.89	$ 2.23
Passenger revenue
Operating revenue:
Total operating revenue	$ 51,829	$ 49,046	$ 40,032
Cargo
Operating revenue:
Total operating revenue	1,743	1,495	2,171
Other operating revenue
Operating revenue:
Total operating revenue	$ 3,491	$ 3,176	$ 2,752

STATEMENTS OF CONSOLIDATED COMP

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (UAH) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 3,149	$ 2,618	$ 737
Other comprehensive income (loss), net of tax:
Employee benefit plans	247	(261)	1,145
Investments and other	3	24	(28)
Total other comprehensive income (loss), net of tax	250	(237)	1,117
Total comprehensive income, net	$ 3,399	$ 2,381	$ 1,854

CONSOLIDATED BALANCE SHEETS (UA

CONSOLIDATED BALANCE SHEETS (UAH) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
ASSETS
Cash and cash equivalents	$ 8,769	$ 6,058
Short-term investments	5,706	8,330
Receivables, net	2,163	1,898
Aircraft fuel, spare parts and supplies, net	1,572	1,561
Prepaid expenses and other	673	640
Total current assets	18,883	18,487
Operating property and equipment, net	42,908	39,815
Operating lease right-of-use assets	3,815	3,914
Goodwill	4,527	4,527
Intangible assets, net	2,683	2,725
Investments in affiliates and other, net	1,267	1,636
Total noncurrent assets	55,200	52,617
Total assets	74,083	71,104
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	4,193	3,835
Accrued salaries and benefits	3,289	2,940
Advance ticket sales	7,561	6,704
Frequent flyer deferred revenue	3,403	3,095
Current maturities of long-term debt, finance leases, and other financial liabilities	3,453	4,247
Current maturities of operating leases	467	576
Other	948	806
Total current liabilities	23,314	22,203
Long-term debt, finance leases, and other financial liabilities	25,203	27,413
Long-term obligations under operating leases	4,510	4,503
Frequent flyer deferred revenue	4,038	4,048
Pension and postretirement benefit liability	1,233	1,605
Deferred income taxes	1,580	594
Other	1,530	1,414
Total noncurrent liabilities	38,094	39,577
Commitments and Contingencies
Stockholders' equity:
Preferred stock	0	0
Common stock at par, $0.01 par value; authorized 1,000,000,000 shares; outstanding 327,899,771 and 328,018,739 shares at December 31, 2024 and 2023, respectively	4	4
Additional capital invested	8,980	8,992
Stock held in treasury, at cost	(3,377)	(3,441)
Retained earnings	6,880	3,831
Accumulated other comprehensive income (loss)	188	(62)
Total stockholders' equity	12,675	9,324
Total liabilities and stockholders' equity	$ 74,083	$ 71,104

CONSOLIDATED BALANCE SHEETS (_2

CONSOLIDATED BALANCE SHEETS (UAH) (Parenthetical) - $ / shares	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	1,000,000,000	1,000,000,000
Common shares, outstanding (in shares)	327,899,771	328,018,739

STATEMENTS OF CONSOLIDATED CASH

STATEMENTS OF CONSOLIDATED CASH FLOWS (UAH) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net income	$ 3,149	$ 2,618	$ 737
Adjustments to reconcile net income to net cash provided by (used in) operating activities -
Deferred income tax	935	756	248
Depreciation and amortization	2,928	2,671	2,456
Operating and non-operating special charges, non-cash portion	158	84	16
Unrealized (gains) losses on investments	199	(27)	(20)
Amortization of debt discount and debt issuance costs	166	139	156
Other operating activities	9	6	218
Changes in operating assets and liabilities -
(Increase) decrease in receivables	280	(100)	(158)
Increase in prepaids and other assets	(166)	(463)	(86)
Increase (decrease) in advance ticket sales	857	(851)	1,200
Increase in frequent flyer deferred revenue	298	468	393
Increase in accounts payable	178	572	796
Increase in other liabilities	454	1,038	110
Net cash provided by operating activities	9,445	6,911	6,066
Investing Activities:
Capital expenditures, net of flight equipment purchase deposit returns	(5,615)	(7,171)	(4,819)
Purchases of short-term and other investments	(5,809)	(9,470)	(11,232)
Proceeds from sale of short-term and other investments	8,661	10,519	2,084
Proceeds from sale of property and equipment	109	39	207
Other, net	3	(23)	(69)
Net cash used in investing activities	(2,651)	(6,106)	(13,829)
Financing Activities:
Proceeds from issuance of debt and other financial liabilities, net of discounts and fees	6,139	2,388	736
Payments of long-term debt, finance leases and other financial liabilities	(10,138)	(4,248)	(4,011)
Repurchases of common stock	(162)	0	0
Other, net	(21)	(32)	(74)
Net cash used in financing activities	(4,182)	(1,892)	(3,349)
Net increase (decrease) in cash, cash equivalents and restricted cash	2,612	(1,087)	(11,112)
Cash, cash equivalents and restricted cash at beginning of year	6,334	7,421	18,533
Cash, cash equivalents and restricted cash at end of year	8,946	6,334	7,421
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt, finance leases and other	406	777	19
Right-of-use assets acquired through operating leases	577	552	137
Lease modifications and lease conversions	290	546	(84)
Investment interests received in exchange for goods and services	18	33	103
Cash Paid During the Period for:
Interest	1,494	1,848	1,573
Income taxes	$ 88	$ 7	$ 8

STATEMENTS OF CONSOLIDATED STOC

STATEMENTS OF CONSOLIDATED STOCKHOLDERS' EQUITY (UAH) - USD ($) $ in Millions	Total	Common Stock	Additional Capital Invested	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2021		323,800,000
Balance at Dec. 31, 2021	$ 5,029	$ 4	$ 9,156	$ (3,814)	$ 625	$ (942)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	737				737
Other comprehensive income (loss)	1,117					1,117
Stock-settled share-based compensation	86		86
Stock issued for share-based awards, net of shares withheld for tax (in shares)		3,100,000
Stock issued for share-based awards, net of shares withheld for tax	(73)		(256)	280	(97)
Balance (in shares) at Dec. 31, 2022		326,900,000
Balance at Dec. 31, 2022	6,896	$ 4	8,986	(3,534)	1,265	175
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,618				2,618
Other comprehensive income (loss)	(237)					(237)
Stock-settled share-based compensation	77		77
Proceeds from exercise of stock options	1		1
Stock issued for share-based awards, net of shares withheld for tax (in shares)		1,100,000
Stock issued for share-based awards, net of shares withheld for tax	$ (31)		(72)	93	(52)
Balance (in shares) at Dec. 31, 2023	328,018,739	328,000,000
Balance at Dec. 31, 2023	$ 9,324	$ 4	8,992	(3,441)	3,831	(62)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,149				3,149
Other comprehensive income (loss)	250					250
Stock-settled share-based compensation	135		135
Repurchases of common stock (in shares)		(3,000,000)
Repurchases of common stock	(162)			(162)
Share issued for settlement of Warrants (in shares)		2,000,000
Share issued for settlement of Warrants	0		(96)	150	(54)
Stock issued for share-based awards, net of shares withheld for tax (in shares)		900,000
Stock issued for share-based awards, net of shares withheld for tax	$ (21)		(51)	76	(46)
Balance (in shares) at Dec. 31, 2024	327,899,771	327,900,000
Balance at Dec. 31, 2024	$ 12,675	$ 4	$ 8,980	$ (3,377)	$ 6,880	$ 188

STATEMENTS OF CONSOLIDATED OP_2

STATEMENTS OF CONSOLIDATED OPERATIONS (UA) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating revenue:
Total operating revenue	$ 57,063	$ 53,717	$ 44,955
Operating expense:
Salaries and related costs	16,678	14,787	11,466
Aircraft fuel	11,756	12,651	13,113
Landing fees and other rent	3,437	3,076	2,576
Aircraft maintenance materials and outside repairs	3,063	2,736	2,153
Depreciation and amortization	2,928	2,671	2,456
Regional capacity purchase	2,516	2,400	2,299
Distribution expenses	2,231	1,977	1,535
Aircraft rent	193	197	252
Special charges	112	949	140
Other operating expenses	9,053	8,062	6,628
Total operating expense	51,967	49,506	42,618
Operating income	5,096	4,211	2,337
Nonoperating income (expense):
Interest expense	(1,629)	(1,956)	(1,778)
Interest income	726	827	298
Interest capitalized	227	182	105
Unrealized gains (losses) on investments, net	(199)	27	20
Miscellaneous, net	(53)	96	8
Total nonoperating expense, net	(928)	(824)	(1,347)
Income before income taxes	4,168	3,387	990
Income tax expense	1,019	769	253
Net income	3,149	2,618	737
Passenger revenue
Operating revenue:
Total operating revenue	51,829	49,046	40,032
Cargo
Operating revenue:
Total operating revenue	1,743	1,495	2,171
Other operating revenue
Operating revenue:
Total operating revenue	3,491	3,176	2,752
United Airlines, Inc.
Operating revenue:
Total operating revenue	57,063	53,717	44,955
Operating expense:
Salaries and related costs	16,678	14,787	11,466
Aircraft fuel	11,756	12,651	13,113
Landing fees and other rent	3,437	3,076	2,576
Aircraft maintenance materials and outside repairs	3,063	2,736	2,153
Depreciation and amortization	2,928	2,671	2,456
Regional capacity purchase	2,516	2,400	2,299
Distribution expenses	2,231	1,977	1,535
Aircraft rent	193	197	252
Special charges	112	949	140
Other operating expenses	9,050	8,059	6,626
Total operating expense	51,964	49,503	42,616
Operating income	5,099	4,214	2,339
Nonoperating income (expense):
Interest expense	(1,629)	(1,956)	(1,778)
Interest income	726	827	298
Interest capitalized	227	182	105
Unrealized gains (losses) on investments, net	(199)	27	20
Miscellaneous, net	(53)	96	8
Total nonoperating expense, net	(928)	(824)	(1,347)
Income before income taxes	4,171	3,390	992
Income tax expense	1,020	770	253
Net income	3,151	2,620	739
United Airlines, Inc. | Passenger revenue
Operating revenue:
Total operating revenue	51,829	49,046	40,032
United Airlines, Inc. | Cargo
Operating revenue:
Total operating revenue	1,743	1,495	2,171
United Airlines, Inc. | Other operating revenue
Operating revenue:
Total operating revenue	$ 3,491	$ 3,176	$ 2,752

STATEMENTS OF CONSOLIDATED CO_2

STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (UA) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net income	$ 3,149	$ 2,618	$ 737
Other comprehensive income (loss), net of tax:
Employee benefit plans	247	(261)	1,145
Investments and other	3	24	(28)
Total other comprehensive income (loss), net of tax	250	(237)	1,117
Total comprehensive income, net	3,399	2,381	1,854
United Airlines, Inc.
Net income	3,151	2,620	739
Other comprehensive income (loss), net of tax:
Employee benefit plans	247	(261)	1,145
Investments and other	3	24	(28)
Total other comprehensive income (loss), net of tax	250	(237)	1,117
Total comprehensive income, net	$ 3,401	$ 2,383	$ 1,856

CONSOLIDATED BALANCE SHEETS (_3

CONSOLIDATED BALANCE SHEETS (UA) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
ASSETS
Cash and cash equivalents	$ 8,769	$ 6,058
Short-term investments	5,706	8,330
Receivables, net	2,163	1,898
Aircraft fuel, spare parts and supplies, net	1,572	1,561
Prepaid expenses and other	673	640
Total current assets	18,883	18,487
Operating property and equipment, net	42,908	39,815
Operating lease right-of-use assets	3,815	3,914
Goodwill	4,527	4,527
Intangible assets, net	2,683	2,725
Investments in affiliates and other, net	1,267	1,636
Total noncurrent assets	55,200	52,617
Total assets	74,083	71,104
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	4,193	3,835
Accrued salaries and benefits	3,289	2,940
Advance ticket sales	7,561	6,704
Frequent flyer deferred revenue	3,403	3,095
Current maturities of long-term debt, finance leases, and other financial liabilities	3,453	4,247
Current maturities of operating leases	467	576
Other	948	806
Total current liabilities	23,314	22,203
Long-term debt, finance leases, and other financial liabilities	25,203	27,413
Long-term obligations under operating leases	4,510	4,503
Frequent flyer deferred revenue	4,038	4,048
Pension and postretirement benefit liability	1,233	1,605
Deferred income taxes	1,580	594
Other	1,530	1,414
Total noncurrent liabilities	38,094	39,577
Commitments and Contingencies
Stockholders' equity:
Common stock at par, 0.01 par value; authorized 1,000 shares; issued and outstanding 1,000 shares at December 31, 2024 and 2023	4	4
Additional capital invested	8,980	8,992
Retained earnings	6,880	3,831
Accumulated other comprehensive income (loss)	188	(62)
Total stockholders' equity	12,675	9,324
Total liabilities and stockholders' equity	74,083	71,104
United Airlines, Inc.
ASSETS
Cash and cash equivalents	8,769	6,058
Short-term investments	5,706	8,330
Receivables, net	2,163	1,898
Aircraft fuel, spare parts and supplies, net	1,572	1,561
Prepaid expenses and other	673	640
Total current assets	18,883	18,487
Operating property and equipment, net	42,908	39,815
Operating lease right-of-use assets	3,815	3,914
Goodwill	4,527	4,527
Intangible assets, net	2,683	2,725
Investments in affiliates and other, net	1,267	1,636
Total noncurrent assets	55,200	52,617
Total assets	74,083	71,104
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	4,193	3,835
Accrued salaries and benefits	3,289	2,940
Advance ticket sales	7,561	6,704
Frequent flyer deferred revenue	3,403	3,095
Current maturities of long-term debt, finance leases, and other financial liabilities	3,453	4,247
Current maturities of operating leases	467	576
Other	949	808
Total current liabilities	23,315	22,205
Long-term debt, finance leases, and other financial liabilities	25,203	27,413
Long-term obligations under operating leases	4,510	4,503
Frequent flyer deferred revenue	4,038	4,048
Pension and postretirement benefit liability	1,233	1,605
Deferred income taxes	1,610	622
Other	1,530	1,414
Total noncurrent liabilities	38,124	39,605
Commitments and Contingencies
Stockholders' equity:
Common stock at par, 0.01 par value; authorized 1,000 shares; issued and outstanding 1,000 shares at December 31, 2024 and 2023	0	0
Additional capital invested	617	482
Retained earnings	9,487	6,336
Accumulated other comprehensive income (loss)	188	(62)
Payable to parent	2,352	2,538
Total stockholders' equity	12,644	9,294
Total liabilities and stockholders' equity	$ 74,083	$ 71,104

CONSOLIDATED BALANCE SHEETS (_4

CONSOLIDATED BALANCE SHEETS (UA) (Parenthetical) - $ / shares	Dec. 31, 2024	Dec. 31, 2023
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	1,000,000,000	1,000,000,000
Common shares, outstanding (in shares)	327,899,771	328,018,739
United Airlines, Inc.
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	1,000	1,000
Common shares, issued (in shares)	1,000	1,000
Common shares, outstanding (in shares)	1,000	1,000

STATEMENTS OF CONSOLIDATED CA_2

STATEMENTS OF CONSOLIDATED CASH FLOWS (UA) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net income	$ 3,149	$ 2,618	$ 737
Adjustments to reconcile net income to net cash provided by (used in) operating activities -
Deferred income tax	935	756	248
Depreciation and amortization	2,928	2,671	2,456
Operating and non-operating special charges, non-cash portion	158	84	16
Unrealized (gains) losses on investments	199	(27)	(20)
Amortization of debt discount and debt issuance costs	166	139	156
Other operating activities	9	6	218
Changes in operating assets and liabilities -
(Increase) decrease in receivables	280	(100)	(158)
Increase in prepaids and other assets	(166)	(463)	(86)
Increase (decrease) in advance ticket sales	857	(851)	1,200
Increase in frequent flyer deferred revenue	298	468	393
Increase in accounts payable	178	572	796
Increase in other liabilities	454	1,038	110
Net cash provided by operating activities	9,445	6,911	6,066
Investing Activities:
Capital expenditures, net of flight equipment purchase deposit returns	(5,615)	(7,171)	(4,819)
Purchases of short-term and other investments	(5,809)	(9,470)	(11,232)
Proceeds from sale of short-term and other investments	8,661	10,519	2,084
Proceeds from sale of property and equipment	109	39	207
Other, net	3	(23)	(69)
Net cash used in investing activities	(2,651)	(6,106)	(13,829)
Financing Activities:
Proceeds from issuance of debt and other financial liabilities, net of discounts and fees	6,139	2,388	736
Payments of long-term debt, finance leases and other financial liabilities	(10,138)	(4,248)	(4,011)
Net cash used in financing activities	(4,182)	(1,892)	(3,349)
Net increase (decrease) in cash, cash equivalents and restricted cash	2,612	(1,087)	(11,112)
Cash, cash equivalents and restricted cash at beginning of year	6,334	7,421	18,533
Cash, cash equivalents and restricted cash at end of year	8,946	6,334	7,421
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt, finance leases and other	406	777	19
Right-of-use assets acquired through operating leases	577	552	137
Lease modifications and lease conversions	290	546	(84)
Investment interests received in exchange for goods and services	18	33	103
Cash Paid During the Period for:
Interest	1,494	1,848	1,573
Income taxes	88	7	8
United Airlines, Inc.
Operating Activities:
Net income	3,151	2,620	739
Adjustments to reconcile net income to net cash provided by (used in) operating activities -
Deferred income tax	937	757	248
Depreciation and amortization	2,928	2,671	2,456
Operating and non-operating special charges, non-cash portion	158	84	16
Unrealized (gains) losses on investments	199	(27)	(20)
Amortization of debt discount and debt issuance costs	166	139	156
Other operating activities	9	7	218
Changes in operating assets and liabilities -
(Increase) decrease in receivables	280	(100)	(158)
Increase in intercompany receivables	(186)	(33)	(76)
Increase in prepaids and other assets	(166)	(463)	(86)
Increase (decrease) in advance ticket sales	857	(851)	1,200
Increase in frequent flyer deferred revenue	298	468	393
Increase in accounts payable	178	572	796
Increase in other liabilities	453	1,035	110
Net cash provided by operating activities	9,262	6,879	5,992
Investing Activities:
Capital expenditures, net of flight equipment purchase deposit returns	(5,615)	(7,171)	(4,819)
Purchases of short-term and other investments	(5,809)	(9,470)	(11,232)
Proceeds from sale of short-term and other investments	8,661	10,519	2,084
Proceeds from sale of property and equipment	109	39	207
Other, net	3	(23)	(69)
Net cash used in investing activities	(2,651)	(6,106)	(13,829)
Financing Activities:
Proceeds from issuance of debt and other financial liabilities, net of discounts and fees	6,139	2,388	736
Payments of long-term debt, finance leases and other financial liabilities	(10,138)	(4,248)	(4,011)
Net cash used in financing activities	(3,999)	(1,860)	(3,275)
Net increase (decrease) in cash, cash equivalents and restricted cash	2,612	(1,087)	(11,112)
Cash, cash equivalents and restricted cash at beginning of year	6,334	7,421	18,533
Cash, cash equivalents and restricted cash at end of year	8,946	6,334	7,421
Investing and Financing Activities Not Affecting Cash:
Property and equipment acquired through the issuance of debt, finance leases and other	406	777	19
Right-of-use assets acquired through operating leases	577	552	137
Lease modifications and lease conversions	290	546	(84)
Investment interests received in exchange for goods and services	18	33	103
Cash Paid During the Period for:
Interest	1,494	1,848	1,573
Income taxes	$ 88	$ 7	$ 8

STATEMENTS OF CONSOLIDATED ST_2

STATEMENTS OF CONSOLIDATED STOCKHOLDERS' EQUITY (UA) - USD ($) $ in Millions	Total	Additional Capital Invested	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	United Airlines, Inc.	United Airlines, Inc. Additional Capital Invested	United Airlines, Inc. Retained Earnings	United Airlines, Inc. Accumulated Other Comprehensive Income (Loss)	United Airlines, Inc. (Receivable from) Payable to Related Parties, Net
Balance at Dec. 31, 2021	$ 5,029	$ 9,156	$ 625	$ (942)	$ 4,998	$ 317	$ 2,977	$ (942)	$ 2,646
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	737		737		739		739
Other comprehensive income (loss)	1,117			1,117	1,117			1,117
Stock-settled share-based compensation	86	86			86	86
Other					(75)				(75)
Balance at Dec. 31, 2022	6,896	8,986	1,265	175	6,865	403	3,716	175	2,571
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,618		2,618		2,620		2,620
Other comprehensive income (loss)	(237)			(237)	(237)			(237)
Stock-settled share-based compensation	77	77			77	77
Other					(31)	2			(33)
Balance at Dec. 31, 2023	9,324	8,992	3,831	(62)	9,294	482	6,336	(62)	2,538
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,149		3,149		3,151		3,151
Other comprehensive income (loss)	250			250	250			250
Stock-settled share-based compensation	135	135			135	135
Impact of UAL share repurchase					(162)				(162)
Other					(24)				(24)
Balance at Dec. 31, 2024	$ 12,675	$ 8,980	$ 6,880	$ 188	$ 12,644	$ 617	$ 9,487	$ 188	$ 2,352

BASIS OF PRESENTATION AND SIGNI

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation United Airlines Holdings, Inc. (together with its consolidated subsidiaries, "UAL" or the "Company") is a holding company incorporated in Delaware and its wholly-owned subsidiary is United Airlines, Inc. (together with its consolidated subsidiaries, "United"). As UAL consolidates United for financial statement purposes, disclosures that relate to activities of United also apply to UAL, unless otherwise noted. United comprises substantially all of UAL's operating revenues, operating expenses, assets, liabilities and operating cash flows. When appropriate, UAL and United are named specifically for their individual contractual obligations and related disclosures and any significant differences between the operations and results of UAL and United are separately disclosed and explained. The Company’s consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). The Company consolidates variable interest entities where it has been determined that the Company is the primary beneficiary of those entities' operations. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. Actual results could differ from those estimates. Segments Operating segments are defined as components of an enterprise with separate financial information, which are evaluated regularly by the chief operating decision maker ("CODM") and are used in resource allocation and performance assessments. T he Company manages it operations as one segment. Managing the Company as one segment allows management the opportunity to maximize the value of its route network and maximize the Company's consolidated financial results. The Company deploys its aircraft across its route network through a single route scheduling system to maximize its value. The Company's chief executive officer is its CODM. When making resource allocation decisions for the network, the Company's CODM evaluates flight profitability data, which considers aircraft type and route economics. The CODM assesses performance of the Company and makes resource allocation decisions based on net income as reported in the Company's statement of consolidated operations. The measure of segment assets is reported on the consolidated balance sheet as Total assets. Within the statement of consolidated operations, Other expenses represent various purchased services related to the operations of the airline such as ground handling, passenger services, food and beverage offerings, navigation fees, personnel-related costs and information technology projects. Significant Accounting Policies Cash and Cash Equivalents and Restricted Cash. Highly liquid investments with a maturity of three months or less on their acquisition date are classified as cash and cash equivalents. Restricted cash is classified as current or noncurrent in the consolidated balance sheets based on the expected timing of return of the assets to the Company or payment to an outside party. The restricted cash balances primarily include collateral associated with the senior secured notes (the "MileagePlus Senior Secured Notes") secured by substantially all of the assets of Mileage Plus Holdings, LLC ("MPH"), a direct wholly-owned subsidiary of United, collateral for letters of credit and collateral associated with facility leases and certain insurance-related obligations. The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of consolidated cash flows (in millions): At December 31, 2024 2023 2022 Current assets: Cash and cash equivalents $ 8,769 $ 6,058 $ 7,166 Restricted cash in Prepaid expenses and other 11 31 45 Noncurrent assets: Restricted cash in Investments in affiliates and other, net 166 245 210 Total cash, cash equivalents and restricted cash $ 8,946 $ 6,334 $ 7,421 Investments. Highly liquid investments with maturities of greater than three months, but not beyond one year, at the time of purchase are classified as short-term investments and are stated at fair value. Investments with maturities beyond one year when purchased are classified as short-term investments if they are expected to be available to support our short-term liquidity needs. Our short-term investments in debt securities are classified as available-for-sale and are stated at fair value. Realized gains and losses on sales of these investments are reflected in Interest income in the statements of consolidated operations. Unrealized gains and losses on available-for-sale debt securities are reflected as a component of accumulated other comprehensive income (loss). Equity investments are accounted for under the equity method if we are able to exercise significant influence over the investee. Equity investments for which we do not have significant influence are recorded at fair value or at cost, if fair value is not readily determinable, with adjustments for observable changes in price or impairments (referred to as the measurement alternative). Changes in fair value are recorded in Unrealized gains (losses) on investments, net in the statements of consolidated operations. See Note 9 of this report for additional information related to investments. Accounts Receivable. Accounts receivable primarily consist of amounts due from credit card companies, non-airline partners, and cargo customers. We provide an allowance for credit losses expected to be incurred. We base our allowance on various factors including, but not limited to, aging, payment history, write-offs, macro-economic indicators and other credit monitoring indicators. Credit loss expense and write-offs related to trade receivables were not material for the years ended December 31, 2024, 2023 and 2022. Aircraft Fuel, Spare Parts and Supplies. The Company accounts for aircraft fuel, spare parts and supplies at average cost and provides an obsolescence allowance for aircraft spare parts with an assumed residual value of 10% of original cost. Allowance for obsolescence was $739 million and $689 million at December 31, 2024 and 2023, respectively. Obsolescence expense was $175 million, $102 million, and $73 million for the years ended December 31, 2024, 2023 and 2022, respectively, and is included in Depreciation and amortization expense in the statements of consolidated operations. Property and Equipment. The Company records additions to owned operating property and equipment at cost when acquired. Costs related to modifications that enhance the operating performance or extend the useful lives of airframes or engines are capitalized as property and equipment. We periodically receive credits in connection with the acquisition of aircraft and engines as well as contractual damages related to delays in delivery or operating performance issues. These credits are generally deferred and are recognized as a reduction to the cost of the related equipment. Depreciation and amortization is recognized on a straight-line basis over the assets' estimated useful lives. Leasehold improvements are amortized over the shorter of the remaining term of the lease or the estimated useful life of the related asset. The estimated useful lives of property and equipment are as follows: Estimated Useful Life (in years) Aircraft, spare engines and related rotable parts 25 to 30 Aircraft seats 10 to 15 Buildings 25 to 45 Other property and equipment 3 to 15 Computer software 5 to 15 Building improvements 1 to 40 Operating property and equipment, net at December 31 was as follows (in millions): 2024 2023 Flight equipment $ 52,696 $ 48,448 Other property and equipment 11,908 10,527 Purchase deposits for flight equipment 3,427 3,550 Total operating property and equipment 68,031 62,525 Less—Accumulated depreciation and amortization (25,123) (22,710) Total operating property and equipment, net $ 42,908 $ 39,815 As of December 31, 2024 and 2023, the Company had a carrying value of computer software of $456 million and $453 million, respectively. For the years ended December 31, 2024, 2023 and 2022, the Company's amortization expense related to computer software was $155 million, $168 million and $166 million, respectively. Aircraft, spare engines and related rotable parts were assumed to have residual values of approximately 10% of original cost, and other categories of property and equipment were assumed to have no residual value. Leases. The Company enters into various leases as a lessee for assets including, but not limited to, airport facilities, airport gates, hanger sites, administrative offices, aircraft, and various other facilities and equipment to support its operations. The Company determines if an arrangement contains a lease at inception. A lease exists when the arrangement conveys the right to control the use of an identified asset over the lease term. Upon lease commencement, the Company records a lease liability for the obligation to make lease payments and right-of-use ("ROU") asset for the right to use the underlying asset for the lease term in the consolidated balance sheets. The lease liability is measured at the commencement date based on the present value of lease payments not yet paid over the lease term, which includes extension and renewal options that are reasonably certain of being exercised, discounted using an incremental borrowing rate that reflects the term of the lease and the particular economic environment at lease commencement. The ROU asset is based on the lease liability, adjusted for lease prepayments, lease incentives received, and the lessee's initial direct costs. The Company does not record a right-of-use asset or lease liability for leases with an initial term of 12 months or less. Lease and non-lease components are combined for all classes of underlying assets, except for capacity purchase agreements ("CPAs") which contain embedded leases for regional aircraft. For these CPAs, the Company allocates consideration to the lease and non-lease components based on their relative standalone values. Many of the Company's leases include variable lease payments, which are not included in the measurement of the right-of-use asset and lease liability. Finance lease right-of-use assets are presented together with Operating property and equipment on the consolidated balance sheets and the related amortization is included in Depreciation and amortization expense. Long-Lived Asset Impairments. The Company evaluates the carrying value of long-lived assets subject to amortization whenever events or changes in circumstances indicate that an impairment may exist. For purposes of this testing, the Company has generally identified the aircraft fleet type as the lowest level of identifiable cash flows for its mainline fleet and the contract level for its regional fleet under CPAs. An impairment charge is recognized when the asset's carrying value exceeds its net undiscounted future cash flows. The amount of the charge is the difference between the asset's carrying value and fair market value. Intangible Assets. The Company has finite-lived and indefinite-lived intangible assets, including goodwill. Finite-lived intangible assets are amortized over their estimated useful lives. Goodwill and indefinite-lived intangible assets are not amortized but are assessed for impairment on an annual basis as of October 1, or more frequently if events or circumstances indicate that the asset may be impaired. The Company typically determines fair value using either market or a variation of the income approach valuation techniques. These measurements include the following key assumptions: (1) forecasted revenues, expenses, margin and cash flows, (2) terminal period growth rate, (3) an estimated weighted average cost of capital, (4) asset-specific risk factor and (5) a tax rate. These assumptions are consistent with those that hypothetical market participants would use. We recognize an impairment when the fair value of an intangible asset is less than its carrying value. For the Company's China route authority, the Company performed a quantitative assessment which involved determining the fair value of the asset and comparing that amount to the asset's carrying value. For all other intangible assets, the Company performed a qualitative assessment of whether it was more likely than not that an impairment had occurred. To determine fair value of the China route authority, the Company used a discounted cash flow method. Key assumptions used in the valuation model included forecasted revenues, margin and an overall discount rate. These assumptions are inherently uncertain as they relate to future events and circumstances. The following table presents information about the Company's goodwill and other intangible assets at December 31 (in millions): 2024 2023 Gross Accumulated Gross Accumulated Goodwill $ 4,527 $ 4,527 Indefinite-lived intangible assets China route authority $ 1,020 $ 1,020 Airport slots 564 574 Tradenames and logos 593 593 Alliances 404 404 Total $ 2,581 $ 2,591 Finite-lived intangible assets Frequent flyer database $ 1,177 $ 1,092 $ 1,177 $ 1,068 Hubs 145 138 145 131 Other 143 133 307 296 Total $ 1,465 $ 1,363 $ 1,629 $ 1,495 Amortization expense in 2024, 2023 and 2022 was $32 million, $37 million and $41 million, respectively. Projected amortization expense in 2025, 2026, 2027, 2028 and 2029 is $28 million, $18 million, $11 million, $10 million and $8 million, respectively. Labor Costs. The Company records expenses associated with new or amendable labor agreements when the amounts are probable and estimable. These could include costs associated with retro-active lump sum cash payments made in conjunction with the ratification of labor agreements. To the extent these upfront costs are in lieu of future pay increases, they would be capitalized and amortized over the term of the labor agreements. If not, these amounts would be expensed. Share-Based Compensation. The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant date fair value of the award. The resulting cost is recognized over the period during which an employee is required to provide service in exchange for the award, which is usually the vesting period. Obligations for cash-settled restricted stock units ("RSUs") are remeasured at fair value throughout the requisite service period at the close of the reporting period based upon UAL's stock price. In addition to the service requirement, certain RSUs have performance metrics that must be achieved prior to vesting. These awards are accrued based on the expected level of achievement at each reporting period. An adjustment is recorded each reporting period to adjust compensation expense based on the then current level of expected performance achievement for the performance-based awards. See Note 5 of this report for additional information on UAL's share-based compensation plans. Maintenance and Repairs . The cost of maintenance and repairs, including the cost of minor replacements, is charged to expense as incurred, except for costs incurred under our power-by-the-hour ("PBTH") engine maintenance agreements. PBTH contracts transfer certain risk to third-party service providers and fix the amount we pay per flight hour or per cycle to the service provider in exchange for maintenance and repairs under a predefined maintenance program. Under PBTH agreements, the Company recognizes expense at a level rate per engine hour, unless the level of service effort and the related payments during the period are substantially consistent, in which case the Company recognizes expense based on the amounts paid. Advertising. Advertising costs, which are included in Other operating expenses, are expensed as incurred. Advertising expenses were $235 million, $221 million and $165 million for the years ended December 31, 2024, 2023 and 2022, respectively. Third-Party Business. The Company has third-party business activity that includes ground handling, maintenance services, flight academy and frequent flyer award non-travel redemptions. Third-party business revenue is recorded in Other operating revenue. Expenses associated with these third-party business activities are recorded in Other operating expenses, except for non-travel mileage redemption. Non-travel mileage redemption expenses are recorded to Other operating revenue. Uncertain Income Tax Positions. The Company has recorded reserves for income taxes and associated interest that may become payable in future years. Although management believes that its positions taken on income tax matters are reasonable, the Company nevertheless established tax and interest reserves in recognition that various taxing authorities may challenge certain of the positions taken by the Company, potentially resulting in additional liabilities for taxes and interest. The Company's uncertain tax position reserves are reviewed periodically and are adjusted as events occur that affect its estimates, such as the availability of new information, the lapsing of applicable statutes of limitation, the conclusion of tax audits, the measurement of additional estimated liability, the identification of new tax matters, the release of administrative tax guidance affecting its estimates of tax liabilities, or the rendering of relevant court decisions. The Company records penalties and interest relating to uncertain tax positions as part of income tax expense in its statements of consolidated operations. See Note 7 of this report for additional information on UAL's uncertain tax positions. Fair Value Measurements. The Company measures certain financial assets and liabilities at fair value on a recurring basis, and certain non-financial assets and liabilities on a nonrecurring basis. The Company uses valuation techniques to measure fair value that maximize the use of observable inputs and minimize the use of unobservable inputs. These inputs are prioritized as follows: • Level 1 - Unadjusted quoted prices in active markets for assets or liabilities identical to those to be reported at fair value • Level 2 - Other inputs that are observable directly or indirectly, such as quoted prices for similar assets or liabilities or market-corroborated inputs • Level 3 - Unobservable inputs for which there is little or no market data and which require us to develop our own assumptions about how market participants would price the assets or liabilities. Recently Issued Accounting Standards Income Taxes. In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures." This ASU enhances disclosures related to income taxes, including the rate reconciliation and information on income taxes paid. This ASU becomes effective for us on January 1, 2025. We are assessing the impact of this ASU and upon adoption may be required to include certain additional disclosures. Expense Disaggregation. In November 2024, the FASB issued ASU No. 2024-03, "Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses." This ASU requires disclosing disaggregated information about certain income statement expense captions but does not change the presentation of expense information or expense captions reported on the face of the income statement. This ASU is effective for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027; early adoption is permitted. We are assessing the impact of this ASU and upon adoption may be required to include certain additional disclosures.

REVENUE RECOGNITION

REVENUE RECOGNITION	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
REVENUE RECOGNITION	REVENUE RECOGNITION Passenger Revenue . Passenger revenue is recognized when transportation is provided. Passenger tickets and related ancillary services sold by the Company for flights are purchased primarily via credit card transactions, with payments collected by the Company in advance of the performance of related services. The Company initially records ticket sales in its Advance ticket sales liability, deferring revenue recognition until the travel occurs. For travel that has more than one flight segment, the Company deems each segment as a separate performance obligation and recognizes revenue for each segment as travel occurs. Tickets sold by other airlines where the Company provides the transportation are recognized as passenger revenue at the estimated value to be billed to the other airline when travel is provided. Differences between amounts billed and the actual amounts may be rejected and rebilled or written off if the amount recorded was different from the original estimate. When necessary, the Company records a reserve against its billings and payables with other airlines based on historical experience. The Company sells certain tickets with connecting flights with one or more segments operated by its other airline partners. For segments operated by its other airline partners, the Company has determined that it is acting as an agent on behalf of the other airlines as they are responsible for their portion of the contract (i.e. transportation of the passenger). The Company, as the agent, recognizes revenue within Other operating revenue at the time of the travel for the net amount representing commission to be retained by the Company for any segments flown by other airlines. Refundable tickets expire after one year from the date of issuance. Non-refundable tickets generally expire on the date of the intended travel, unless the date is extended by notification from the customer on or before the intended travel date. United initially capitalizes the costs of selling airline travel tickets and then recognizes those costs as Distribution expense at the time of travel. Costs to sell a ticket include credit card fees, travel agency and other commissions paid, as well as global distribution systems booking fees. Advance ticket sales. Advance ticket sales represent the Company's liability to provide air transportation in the future. All tickets sold at any given point in time have travel dates through the next 12 months. The Company defers amounts related to future travel in its Advance ticket sales liability account. Estimate of tickets not expected to be used ("ticket breakage"). The Company estimates the value of Advance ticket sales that will expire unused and recognizes revenue and any changes in estimates in proportion to the usage of the related tickets. To determine ticket breakage, the Company uses its historical experience with expired tickets and certificates and other facts, such as recent aging trends, program changes and modifications that could affect the ultimate expiration patterns. In the years ended December 31, 2024, 2023 and 2022, the Company recognized approximately $5.3 billion, $5.7 billion and $3.3 billion, respectively, of passenger revenue for tickets that were included in Advance ticket sales at the beginning of those periods. Revenue by geography. The Company further disaggregates its operating revenue by principal geographic region for the years ended December 31 is presented in the table below (in millions): 2024 2023 2022 Domestic (U.S. and Canada) $ 34,067 $ 32,400 $ 28,474 Atlantic 11,097 10,982 9,072 Pacific 6,462 5,267 2,927 Latin America 5,437 5,068 4,482 Total $ 57,063 $ 53,717 $ 44,955 The Company attributes revenue among the geographic areas based upon the origin and destination of each flight segment. The Company's operations involve an insignificant level of revenue-producing assets in geographic regions as the overwhelming majority of the Company's revenue-producing assets (primarily U.S. registered aircraft) can be deployed in any of its geographic regions. Ancillary services. The Company charges fees, separately from ticket sales, for certain ancillary services that are directly related to passengers' travel, such as baggage fees, premium seat fees, inflight amenity fees, and other ticket-related fees. These ancillary fees are part of the travel performance obligation and, as such, are recognized as passenger revenue when the travel occurs. The Company recorded $4.5 billion, $4.1 billion and $3.4 billion of ancillary fees within passenger revenue in the years ended December 31, 2024, 2023 and 2022, respectively. Ticket Taxes. Certain governmental taxes are imposed on the Company's ticket sales through a fee included in ticket prices. The Company collects these fees and remits them to the appropriate government agency. These fees are excluded from the contract transaction price and are therefore not included in passenger revenue. We record a liability when amounts are collected and reduce the liability when payments are made to the appropriate taxing authority. Frequent Flyer Program . United's MileagePlus loyalty program builds customer loyalty by offering awards, benefits and services to program participants. Members in this program earn miles for travel on United, United Express, Star Alliance members and certain other airlines that participate in the program. Members can also earn miles by purchasing goods and services from our network of non-airline partners. We have contracts to sell miles to these partners with the terms extending from approximately one Miles earned in conjunction with travel. When frequent flyers earn miles for flights, the Company recognizes a portion of the ticket sales as revenue when the travel occurs and defers a portion of the ticket sale representing the value of the related miles as a separate performance obligation. The Company determines the estimated selling price of travel and miles as if each element is sold on a separate basis. The total consideration from each ticket sale is then allocated to each of these elements, individually, on a pro-rata basis. At the time of travel, the Company records the portion allocated to the miles to Frequent flyer deferred revenue on the Company's consolidated balance sheet and subsequently recognizes it into revenue when miles are redeemed for air travel and non-air travel awards. Estimate of miles not expected to be redeemed ("breakage") . The Company's breakage model is based on the assumption that the likelihood that an account will redeem its miles can be estimated based on a consideration of the account's historical behavior. The Company uses a statistical model to estimate the probability that an account will redeem its current miles balance and reviews its breakage estimates annually. The Company's estimate of the expected breakage of miles requires management judgment. Changes to breakage assumptions, or to program rules and program redemption opportunities, may result in material changes to the deferred revenue balance as well as recognized revenues from the program. We recognize breakage proportionally as the remaining miles are redeemed. Estimated selling price of miles . The Company's estimated selling price of miles is based on an equivalent ticket value, which incorporates the expected redemption of miles, as the best estimate of selling price for these miles. The equivalent ticket value is based on the prior 12 months' weighted average equivalent ticket value of similar fares as those used to settle award redemptions while taking into consideration such factors as redemption pattern, cabin class, loyalty status and geographic region. The estimated selling price of miles is adjusted by breakage that considers a number of factors, including redemption patterns of various customer groups. Co-Brand agreement . United's most significant contract to sell MileagePlus miles is with its co-branded credit card partner JPMorgan Chase Bank USA, N.A. ("Chase"). Chase awards miles to MileagePlus members based on their credit card activity. United identified the following significant separately identifiable performance obligations in this contract (the "Co-Brand Agreement"): • MileagePlus miles awarded – United has a performance obligation to provide MileagePlus cardholders with miles to be used for air travel and non-travel award redemptions. The Company records Passenger revenue related to the travel awards when the transportation is provided and records Other operating revenue related to the non-travel awards when the goods or services are delivered. The Company records the cost associated with non-travel awards in Other operating revenue, as an agent. • Marketing – United has a performance obligation to provide Chase access to United's customer list and the use of United's brand. Marketing revenue is recorded to Other operating revenue as miles are delivered to Chase. • Advertising – United has a performance obligation to provide advertising in support of the MileagePlus card in various customer contact points such as United's website, email promotions, direct mail campaigns, airport advertising and in-flight advertising. Advertising revenue is recorded to Other operating revenue as miles are delivered to Chase. • Other travel-related benefits – United's performance obligations are comprised of various items such as waived bag fees, seat upgrades and lounge passes. Lounge passes are recorded to Other operating revenue as customers use the lounge passes. Bag fees and seat upgrades are recorded to Passenger revenue at the time of the associated travel. We account for all the payments received under the Co-Brand Agreement by allocating them to the separately identifiable performance obligations. The fair value of the separately identifiable performance obligations is determined using management's estimated selling price of each component. The objective of using the estimated selling price based methodology is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. Accordingly, we determine our best estimate of selling price by considering multiple inputs and methods including, but not limited to, discounted cash flows, brand value, volume discounts, published selling prices, number of miles awarded and number of miles redeemed. The Company estimated the selling prices and volumes over the term of the Co-Brand Agreement, at the inception of the contract, in order to determine the allocation of proceeds to each of the components to be delivered. Frequent flyer deferred revenue. Miles in MileagePlus members' accounts are combined into one homogeneous pool and are thus not separately identifiable, for award redemption purposes, between miles earned in the current period and those in their beginning balance. Of the miles expected to be redeemed, the Company expects the majority of these miles to be redeemed within two years. The current portion of the Frequent flyer deferred revenue is based on expected redemptions in the next 12 months. The table below presents a roll forward of Frequent flyer deferred revenue (in millions): 2024 2023 Balance at January 1 $ 7,143 $ 6,675 Miles earned 3,563 3,297 Travel miles redeemed (3,150) (2,723) Non-travel miles redeemed (115) (106) Balance at December 31 $ 7,441 $ 7,143 In the years ended December 31, 2024, 2023 and 2022, the Company recognized, in Other operating revenue, $2.9 billion, $2.7 billion and $2.4 billion, respectively, related to the marketing, advertising, non-travel miles redeemed (net of related costs) and other travel-related benefits of the mileage revenue associated with our various partner agreements including, but not limited to, our Co-Brand Agreement. The portion related to the MileagePlus miles awarded of the total amounts received from our various partner agreements is deferred and presented in the table above as an increase to Total Frequent flyer deferred revenue. Cargo Revenue.

COMMON STOCKHOLDERS' EQUITY AND

COMMON STOCKHOLDERS' EQUITY AND PREFERRED SECURITIES	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
COMMON STOCKHOLDERS' EQUITY AND PREFERRED SECURITIES	COMMON STOCKHOLDERS' EQUITY AND PREFERRED SECURITIES Common stock. On October 15, 2024, the Company announced that its Board of Directors (the "Board") authorized a new share repurchase program, allowing for purchases of up to $1.5 billion in the aggregate of outstanding UAL common stock and certain Warrants (as defined below) issued in connection with the Coronavirus Aid, Relief, and Economic Security Act (the "CARES Act"), subject to a limit of $500 million in the aggregate through 2024. During the quarter ended December 31, 2024, the Company repurchased 997,076 shares of UAL common stock at an average price of $81.26 for a total investment of approximately $81 million as part of the program. As of February 24, 2025, the dollar value of shares that may yet be purchased under the program is approximately $1.3 billion. Unless suspended or terminated earlier by the Board, this program has no set expiration date and will therefore terminate when the Company has completed all purchases authorized under the program. The specific timing and number of shares of UAL common stock or Warrants purchased will be determined by the Company's management at its discretion and will vary based on the capital needs of the business, the market price of UAL common stock, general market conditions, securities law limitations and other factors. The purchases may be effected through a combination of one or more open market and privately negotiated transactions (including under trading plans intended to comply with Rule 10b5-1 under the Securities Exchange Act of 1934, as amended (the "Exchange Act")) as well as transactions structured through investment banking institutions and other derivative transactions (including through one or more accelerated share repurchase programs). In August 2024, the Company also repurchased, through open market repurchases, following the exercise of the Warrants described below, 2,043,906 shares of UAL common stock, which was recorded as an approximately $82 million increase to stock held in treasury, at cost. These share repurchases were executed outside of a publicly announced plan or program using cash resources. As of December 31, 2024, approximately 3.5 million shares of UAL's common stock were reserved for future issuance related to the issuance of equity-based awards under the Company's incentive compensation plans. Preferred stock. As of December 31, 2024, UAL had two shares of junior preferred stock (par value $0.01 per share) outstanding. In addition, UAL is authorized to issue 250 million shares of preferred stock (without par value) under UAL's amended and restated certificate of incorporation. Warrants. In 2020 and 2021, the Company issued to the United States Department of the Treasury (the "U.S. Treasury") warrants ("Warrants") to purchase 9,928,349 shares of UAL common stock in connection with the Payroll Support Program ("PSP") established under Division A, Title IV, Subtitle B of the CARES Act, the Payroll Support Program Extension established under Division N, Title IV, Subtitle A of the Consolidated Appropriations Act, 2021 ("PSP2"), the Payroll Support Program 3 established under Title VII, Subtitle C of the American Rescue Plan Act of 2021 ("PSP3"), and the Airline Loan Program established under Division A, Title IV, Subtitle A of the CARES Act. In August 2024, the holder of the Warrants exercised 6,414,635, or 65%, of the Warrants, with an exercise price of $31.50, in a net share settlement for 2,043,906 shares of UAL common stock. As of December 31, 2024, the Company had the below Warrants outstanding: Warrant Description Number of Shares of UAL Common Stock Exercise Price Expiration Dates PSP2 Warrants 2,011,924 $ 43.26 1/15/2026 — 4/29/2026 PSP3 Warrants 1,501,790 53.92 4/29/2026 — 6/10/2026 Total 3,513,714

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE The computations of UAL's basic and diluted earnings per share are set forth below for the years ended December 31 (in millions, except per share amounts): 2024 2023 2022 Earnings available to common stockholders $ 3,149 $ 2,618 $ 737 Basic weighted-average shares outstanding 328.6 327.8 326.4 Dilutive effect of stock Warrants (a) 1.7 2.2 1.5 Dilutive effect of employee stock awards 2.9 1.9 2.2 Diluted weighted-average shares outstanding 333.2 331.9 330.1 Earnings per share, basic $ 9.58 $ 7.98 $ 2.26 Earnings per share, diluted $ 9.45 $ 7.89 $ 2.23 Potentially dilutive securities (b) Stock Warrants (a) — 1.5 3.5 Employee stock awards 0.3 0.6 0.7 (a) See Note 3 of this report for additional information about these Warrants. (b) Weighted-average potentially dilutive securities outstanding excluded from the computation of diluted earnings per share because the securities would have had an antidilutive effect.

SHARE-BASED COMPENSATION PLANS

SHARE-BASED COMPENSATION PLANS	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
SHARE-BASED COMPENSATION PLANS	SHARE-BASED COMPENSATION PLANS UAL maintains share-based compensation plans for our management employees and our non-employee directors. These plans provide for grants of nonqualified stock options; incentive stock options (within the meaning of Section 422 of the Internal Revenue Code of 1986); stock appreciation rights ("SARs"); restricted stock; RSUs; performance units; cash incentive awards and other equity-based and equity-related awards. An award (other than an option, SAR or cash incentive award) may provide the holder with dividends or dividend equivalents. All awards are recorded as either equity or a liability in the Company's consolidated balance sheets. Share-based compensation expense is recorded in Salaries and related costs. During 2024, UAL granted share-based compensation awards pursuant to the United Airlines Holdings, Inc. 2021 Incentive Compensation Plan. These share-based compensation awards included approximately 3.7 million RSUs consisting of approximately 2.0 million time-vested RSUs and approximately 1.7 million performance-based RSUs. The time-vested RSUs vest pro-rata, a majority of which vest on February 28th of each year, over a three-year period from the date of grant. Performance-based awards vest either pro-rata, one-third each year, over a three-year period from the date of grant or all at once upon continuous employment with the Company over a three-year period. Payout under the performance-based awards can range from 0% to 300% depending on the achievement level of certain financial and strategic goals. RSUs are generally equity awards settled in stock for domestic employees and liability awards settled in cash for international employees. The cash payments are based on the 20-day average closing price of UAL common stock immediately prior to the vesting date. The following table provides information related to UAL's share-based compensation plan cost for the years ended December 31 (in millions): Compensation cost 2024 2023 2022 RSUs $ 141 $ 78 $ 87 Stock options 1 2 2 Total $ 142 $ 80 $ 89 The table below summarizes UAL's unearned compensation and weighted-average remaining period to recognize costs for all outstanding share-based awards that are probable of being achieved as of December 31, 2024 (in millions, except as noted): Unearned Compensation Weighted-Average RSUs $ 110 1.5 Stock options 2 2.2 Total $ 112 Restricted stock units. The table below summarizes UAL's RSU activity for the years ended December 31 (shares in millions): Liability Awards Equity Awards RSUs RSUs Weighted- Outstanding at December 31, 2021 0.2 4.4 $ 53.63 Granted 0.1 2.3 31.96 Additional issuance due to achievement of performance metrics — 1.6 58.17 Vested (0.2) (4.8) 56.00 Forfeited — (0.2) 53.03 Outstanding at December 31, 2022 0.1 3.3 37.88 Granted 0.1 2.5 43.42 Vested (0.1) (1.6) 44.03 Forfeited — (0.1) 36.90 Outstanding at December 31, 2023 0.1 4.1 38.86 Granted 0.1 3.6 46.65 Vested (0.1) (2.3) 39.37 Forfeited — (0.3) 43.28 Outstanding at December 31, 2024 0.1 5.1 43.89 The fair value of RSUs that vested in 2024, 2023 and 2022 was approximately $91 million, $76 million and $274 million, respectively. As of December 31, 2024, UAL had recorded a liability of approximately $8 million related to its cash-settled RSUs. UAL paid approximately $2 million, $3 million and $7 million related to its cash-settled RSUs during 2024, 2023 and 2022, respectively.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ("AOCI")	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ("AOCI")	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ("AOCI") The table below presents the components of the Company's AOCI, net of tax (in millions): Pension and Investments and Other Deferred Taxes (a) Total Balance at December 31, 2021 $ (847) $ — $ (95) $ (942) Changes in value 1,474 (35) (321) 1,118 Amounts reclassified to earnings (1) (b) — — (1) Balance at December 31, 2022 626 (35) (416) 175 Changes in value (199) 31 38 (130) Amounts reclassified to earnings (138) (b) — 31 (107) Balance at December 31, 2023 289 (4) (347) (62) Changes in value 417 4 (94) 327 Amounts reclassified to earnings (99) (b) — 22 (77) Balance at December 31, 2024 $ 607 $ — $ (419) $ 188 (a) Includes approximately $285 million of deferred income tax expense that will not be recognized in net income until the related pension and postretirement benefit obligations are fully extinguished. We consider all income sources, including other comprehensive income, in determining the amount of tax benefit allocated to results from operations. (b) This AOCI component is included in the computation of net periodic pension and other postretirement costs, specifically the following components: amortization of unrecognized (gain) loss, amortization of prior service credit and other. See Note 8 of this report for additional information on pensions and other postretirement liabilities.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The income tax provision differed from amounts computed at the statutory federal income tax rate and consisted of the following significant components (in millions) : 2024 2023 2022 Income tax provision at statutory rate $ 875 $ 711 $ 208 State income tax provision, net of federal income tax benefit 56 46 13 Nondeductible employee meals 16 15 12 Nondeductible transportation fringe benefit 16 13 10 Valuation allowance 29 (21) (10) Other, net 27 5 20 Income tax expense $ 1,019 $ 769 $ 253 Current $ 84 $ 13 $ 5 Deferred 935 756 248 Income tax expense $ 1,019 $ 769 $ 253 Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2024 and 2023 were as follows (in millions): UAL United 2024 2023 2024 2023 Deferred income tax asset (liability): Federal and state net operating loss ("NOL") carryforwards $ 2,149 $ 2,644 $ 2,119 $ 2,616 Deferred revenue 1,865 1,845 1,865 1,845 Employee benefits, including pension, postretirement and medical 608 695 608 695 Operating lease liabilities 1,110 1,134 1,110 1,134 Other financial liabilities 517 414 517 414 Interest expense carryforward 467 579 467 579 Other 565 575 565 575 Less: Valuation allowance (208) (179) (208) (179) Total deferred tax assets $ 7,073 $ 7,707 $ 7,043 $ 7,679 Depreciation $ (7,171) $ (6,782) $ (7,171) $ (6,782) Operating lease right-of-use asset (863) (887) (863) (887) Intangibles (619) (632) (619) (632) Total deferred tax liabilities $ (8,653) $ (8,301) $ (8,653) $ (8,301) Net deferred tax asset (liability) $ (1,580) $ (594) $ (1,610) $ (622) United and its domestic consolidated subsidiaries file a consolidated federal income tax return with UAL. Under an intercompany tax allocation policy, United and its subsidiaries compute, record and pay UAL for their own tax liabilities as if they were separate companies filing separate returns. In determining their own tax liabilities, United and each of its subsidiaries take into account all tax credits or benefits generated and utilized as separate companies and they are each compensated for the aforementioned tax benefits on an annual basis. The Company's federal and state NOL and tax credit carryforwards relate to prior years' NOLs and credits, which may be used to reduce tax liabilities in future years. These tax benefits are mostly attributable to federal pre-tax NOL carryforwards of $9.7 billion ($2.0 billion tax effected) for UAL. If not utilized, $0.1 billion of these federal pre-tax NOLs will expire in 2029. The remaining $9.6 billion of NOLs has no expiration date. State pre-tax NOLs of $3.0 billion ($0.2 billion tax effected) expire over a 1 to 20-year period. State tax credits of $58 million will expire over a 1 to 15-year period. As of December 31, 2024, the Company has recorded $179 million of valuation allowance against its capital loss deferred tax assets. Capital losses have a limited carryforward period of five years, and they can be utilized only to the extent of capital gains. The Company does not anticipate generating sufficient capital gains to utilize the losses before they expire, therefore, a valuation allowance is necessary as of December 31, 2024. Additionally, the Company recorded a valuation allowance of $29 million on certain state deferred tax assets primarily due to state NOLs that have short expiration periods. The Company's unrecognized tax benefits related to uncertain tax positions were $70 million, $66 million and $58 million at December 31, 2024, 2023 and 2022, respectively. All of the uncertain tax positions would affect the Company's effective tax rate if recognized. The changes in unrecognized tax benefits relating to settlements with taxing authorities, unrecognized tax benefits as a result of tax positions taken during a prior period and unrecognized tax benefits relating from a lapse of the statute of limitations were immaterial during 2024, 2023 and 2022. The Company does not expect significant increases or decreases in their unrecognized tax benefits within the next 12 months. There are no material amounts included in the balance at December 31, 2024 for tax positions for which the ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility. The Company's federal income tax returns for tax years after 2000 remain subject to examination by the Internal Revenue Service and state taxing jurisdictions.

PENSION, POSTRETIREMENT AND OTH

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS	PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS The following summarizes the significant pension and other postretirement plans of United: Pension Plans. United maintains two primary defined benefit pension plans, one covering certain pilot employees and another covering certain U.S. non-pilot employees. Each of these plans provides benefits based on a combination of years of benefit accruals service and an employee's final average compensation. Additional benefit accruals are frozen under the plan covering certain pilot employees and for management and administrative employees covered under the non-pilot plan. Benefit accruals for certain non-pilot employees continue. United maintains additional defined benefit pension plans, which cover certain international employees. Other Postretirement Plans. United maintains postretirement medical programs which provide medical benefits to certain retirees and eligible dependents, as well as life insurance benefits to certain retirees participating in the plan. Benefits provided are subject to applicable contributions, co-payments, deductibles and other limits as described in the specific plan documentation. Actuarial assumption changes are reflected as a component of the net actuarial (gain) loss. The 2024 actuarial gains were mainly related to discount rate changes in 2024. Actuarial (gains) losses will be amortized over the average remaining service life of the covered active employees. The following tables set forth the reconciliation of the beginning and ending balances of the benefit obligation and plan assets, the funded status and the amounts recognized in these financial statements for the defined benefit and other postretirement plans (in millions): Pension Benefits Year Ended December 31, 2024 Year Ended December 31, 2023 Accumulated benefit obligation: $ 3,752 $ 3,910 Change in projected benefit obligation: Projected benefit obligation at beginning of year $ 4,550 $ 4,181 Service cost 135 124 Interest cost 229 217 Actuarial (gain) loss (460) 204 Benefits paid (135) (177) Other (4) 1 Projected benefit obligation at end of year $ 4,315 $ 4,550 Change in plan assets: Fair value of plan assets at beginning of year $ 3,599 $ 3,467 Actual income on plan assets 132 281 Employer contributions 5 22 Benefits paid (135) (177) Other — 6 Fair value of plan assets at end of year $ 3,601 $ 3,599 Funded status—Net amount recognized $ (714) $ (951) Pension Benefits December 31, 2024 December 31, 2023 Amounts recognized in the consolidated balance sheets consist of: Noncurrent asset $ 22 $ 21 Current liability (7) (4) Noncurrent liability (729) (968) Total liability $ (714) $ (951) Amounts recognized in accumulated other comprehensive income (loss) consist of: Net actuarial gain (loss) $ 95 $ (242) Total accumulated other comprehensive gain (loss) $ 95 $ (242) Other Postretirement Benefits Year Ended December 31, 2024 Year Ended December 31, 2023 Change in benefit obligation: Benefit obligation at beginning of year $ 746 $ 788 Service cost 5 4 Interest cost 38 42 Plan participants' contributions 65 67 Benefits paid (163) (177) Actuarial (gain) loss (101) 22 Benefit obligation at end of year $ 590 $ 746 Change in plan assets: Fair value of plan assets at beginning of year $ 46 $ 48 Actual return on plan assets 1 1 Employer contributions 96 107 Plan participants' contributions 65 67 Benefits paid (163) (177) Fair value of plan assets at end of year 45 46 Funded status—Net amount recognized $ (545) $ (700) Other Postretirement Benefits December 31, 2024 December 31, 2023 Amounts recognized in the consolidated balance sheets consist of: Current liability $ (41) $ (63) Noncurrent liability (504) (637) Total liability $ (545) $ (700) Amounts recognized in accumulated other comprehensive income (loss) consist of: Net actuarial gain $ 383 $ 309 Prior service credit 129 222 Total accumulated other comprehensive income $ 512 $ 531 The following information relates to all pension plans with an accumulated benefit obligation and a projected benefit obligation in excess of plan assets at December 31 (in millions): 2024 2023 Projected benefit obligation $ 4,179 $ 4,407 Accumulated benefit obligation 3,617 3,767 Fair value of plan assets 3,443 3,435 Net periodic benefit cost (credit) for the years ended December 31 included the following components (in millions): 2024 2023 2022 Pension Benefits Other Postretirement Benefits Pension Benefits Other Postretirement Benefits Pension Benefits Other Postretirement Benefits Service cost $ 135 $ 5 $ 124 $ 4 $ 204 $ 9 Interest cost 229 38 217 42 188 30 Expected return on plan assets (276) (1) (251) (1) (306) (1) Amortization of unrecognized actuarial (gain) loss 19 (26) 8 (38) 120 (14) Amortization of prior service (credits) cost — (93) 1 (112) — (112) Other 1 — 3 — 5 — Net periodic benefit cost (credit) $ 108 $ (77) $ 102 $ (105) $ 211 $ (88) Service cost is recorded in Salaries and related costs on the statement of consolidated operations. All other components of net periodic benefit costs are recorded in Miscellaneous, net on the statement of consolidated operations. The Company's expected Net periodic benefit cost (credit) for 2025 is as follows (in millions): Pension Benefits Other Postretirement Benefits Net periodic benefit cost (credit) $ 91 $ (81) The assumptions used for the benefit plans were as follows: Pension Benefits Assumptions used to determine benefit obligations 2024 2023 Discount rate 5.67 % 5.04 % Rate of compensation increase 3.85 % 3.84 % Assumptions used to determine net expense Discount rate 5.04 % 5.20 % Expected return on plan assets 7.97 % 7.53 % Rate of compensation increase 3.84 % 3.83 % Other Postretirement Benefits Assumptions used to determine benefit obligations 2024 2023 Discount rate 5.70 % 5.43 % Assumptions used to determine net expense Discount rate 5.43 % 5.66 % Expected return on plan assets 3.00 % 3.00 % Health care cost trend rate assumed for next year 6.75 % 7.00 % Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2033) 4.50 % 4.50 % The Company used the Society of Actuaries' PRI-2012 Private Retirement Plans Mortality Tables projected generationally using the Society of Actuaries' MP-2021 projection scale. The Company selected the 2024 discount rate for substantially all of its plans by using a hypothetical portfolio of high-quality bonds at December 31, 2024 that would provide the necessary cash flows to match projected benefit payments. We develop our expected long-term rate of return assumption for our defined benefit plans based on historical experience and by evaluating input from the trustee managing the plans' assets. Our expected long-term rate of return on plan assets for these plans is based on a target allocation of assets, which is based on our goal of earning the highest rate of return while maintaining risk at acceptable levels. The plans strive to have assets sufficiently diversified so that adverse or unexpected results from one security class will not have an unduly detrimental impact on the entire portfolio. Plan fiduciaries regularly review our actual asset allocation and the pension plans' investments are periodically rebalanced to our targeted allocation when considered appropriate. United's plan assets are allocated within the following guidelines: Percent of Total Expected Long-Term Equity securities 27 - 55 % 9 % Fixed-income securities 33 - 61 7 Alternatives 7 - 25 7 The table below shows the impacts of a change in certain assumptions on the 2025 net periodic benefit cost and the benefit obligations at December 31, 2024 (in millions): Pension Benefits Other Postretirement Benefits Impact on Benefit Obligation at December 31, 2024 100 basis points decrease in the weighted average discount rate $ 745 $ 38 Impact on 2025 Net Periodic Benefit Cost 100 basis points decrease in the weighted average discount rate (a) $ 83 $ — 100 basis points decrease in the expected long-term rate of return on plan assets 35 — (a) In general, as discount rates increase, the impact of changes in discount rates decreases. Therefore, these sensitivities cannot be extrapolated for larger increases or decreases in the discount rate. In addition, benefit cost is affected by other factors including, but not limited to, investment performance, contributions, demographic experience and other assumption changes. Fair Value Information . Assets and liabilities measured at fair value are based on the following valuation techniques: Market approach. Prices and other relevant information generated by market transactions involving identical or comparable assets and liabilities. Income approach. Techniques to convert future amounts to a single current value based on market expectations (including present value techniques, option-pricing and excess earnings models). The following tables present information about United's pension and other postretirement plan assets at December 31 (in millions): 2024 2023 Pension Plan Assets: Total Level 1 Level 2 Level 3 Assets Measured at NAV(a) Total Level 1 Level 2 Level 3 Assets Measured at NAV(a) Equity securities funds $ 1,231 $ 92 $ 4 $ 150 $ 985 $ 1,265 $ 74 $ 3 $ 134 $ 1,054 Fixed-income securities 1,359 — 100 1 1,258 1,325 — 411 3 911 Alternatives 762 — — 116 646 779 — — 136 643 Other investments 249 14 153 2 80 230 13 87 3 127 Total $ 3,601 $ 106 $ 257 $ 269 $ 2,969 $ 3,599 $ 87 $ 501 $ 276 $ 2,735 Other Postretirement Benefit Plan Assets: Deposit administration fund $ 45 $ — $ — $ 45 $ — $ 46 $ — $ — $ 46 $ — (a) In accordance with the relevant accounting standards, certain investments that are measured at fair value using the net asset value ("NAV") per share (or its equivalent) have not been classified in the fair value hierarchy. These investments are commingled funds that invest in equity securities and fixed-income instruments including bonds, debt securities, and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. Redemption periods for these investments range from daily to semiannually. Equity and Fixed-Income. Equities include investments in both developed market and emerging market equity securities. Fixed-income includes primarily U.S. and non-U.S. government fixed-income securities and non-U.S. corporate fixed-income securities, as well as securitized debt securities. Deposit Administration Fund. This investment is a stable value investment product structured to provide investment income. Alternatives. Alternative investments consist primarily of investments in hedge funds, real estate and private equity interests. Other investments. Other investments consist of primarily cash equivalents, as well as insurance contracts. The following table presents reconciliation of United's benefit plan assets measured at fair value using unobservable inputs (Level 3) for the years ended December 31, 2024 and 2023 (in millions): 2024 2023 Balance at beginning of year $ 322 $ 333 Actual income (loss) on plan assets: Sold during the year 1 (50) Held at year end 6 55 Purchases, sales, issuances and settlements (net) (15) (16) Balance at end of year $ 314 $ 322 Funding requirements for tax-qualified defined benefit pension plans are determined by government regulations. The Company expects to make required contributions to its tax-qualified defined benefit pension plans in 2025. In 2025, employer anticipated contributions to all of United's pension and postretirement plans are at least $141 million and approximately $80 million, respectively. The estimated future benefit payments, net of expected participant contributions, in United's pension plans and other postretirement benefit plans for the next ten years, as of December 31, 2024, are as follows (in millions): Pension Other Postretirement 2025 $ 311 $ 88 2026 328 79 2027 348 70 2028 372 66 2029 371 62 Years 2030 – 2034 1,863 218 Defined Contribution Plans. United offers several defined contribution plans to its employees. Depending upon the employee group, employer contributions consist of matching contributions and/or non-elective employer contributions. United's employer contribution percentages to its primary 401(k) defined contribution plans vary from 1% to 17% of eligible earnings depending on the terms of each plan. United recorded expenses for its primary 401(k) defined contribution plans of $1.2 billion, $960 million and $756 million in the years ended December 31, 2024, 2023 and 2022, respectively. Multi-Employer Plans. United's participation in the IAM National Pension Plan ("IAM Plan") for the annual period ended December 31, 2024 is outlined in the table below. The risks of participating in these multi-employer plans are different from single-employer plans, as United may be subject to additional risks that others do not meet their obligations, which in certain circumstances could revert to United, or if a withdrawal from a multi-employer plan occurs for United. The IAM Plan reported $570 million in employers' contributions for the year ended December 31, 2023. For 2023, the Company's contributions to the IAM Plan represented more than 5% of total contributions to the IAM Plan. The 2024 information is not available as the applicable Form 5500 is not final for the plan year. Pension Fund IAM National Pension Fund ("IAM Fund") EIN/ Pension Plan Number 51-6031295 — 002 Pension Protection Act Zone Status (2024 and 2023) Critical (2024 and 2023). A plan is in "critical" status if the funded percentage is less than 65 percent. On April 17, 2019, the IAM National Pension Fund Board of Trustees voluntarily elected for the IAM Fund to be in critical status effective for the plan year beginning January 1, 2019 to strengthen the IAM Fund's financial health. The IAM Fund's funded percentage was 86.5% as of January 1, 2023. FIP/RP Status Pending/Implemented A 10-year Rehabilitation Plan effective, January 1, 2022, was adopted on April 17, 2019 that requires the Company to make an additional contribution of 2.5% of the hourly contribution rate, compounded annually for the length of the Rehabilitation Plan, effective June 1, 2019. United's Contributions $95 million, $87 million and $75 million in the years ended December 31, 2024, 2023 and 2022, respectively. Surcharge Imposed No Expiration Date of Collective Bargaining Agreement N/A Profit Sharing. Substantially all of our employees are eligible to participate in our profit sharing plan. Under the plan, for each year in which our adjusted pre-tax profit (which is calculated as pre-tax profit, excluding unusual, special or non-recurring charges, profit sharing expense and share-based compensation) exceeds a certain amount, a specified portion of that profit will be distributed to eligible employees. The Company recorded profit sharing and related payroll tax expense of $713 million, $681 million and $133 million in 2024, 2023 and 2022, respectively. Profit sharing expense is recorded as a component of Salaries and related costs in the Company's statements of consolidated operations.

FAIR VALUE MEASUREMENTS, INVEST

FAIR VALUE MEASUREMENTS, INVESTMENTS AND NOTES RECEIVABLE	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS, INVESTMENTS AND NOTES RECEIVABLE	FAIR VALUE MEASUREMENTS, INVESTMENTS AND NOTES RECEIVABLE Fair Value Measurement. The table below presents the fair value of financial assets and liabilities measured at fair value, based on the inputs described in Note 1, on a recurring basis in the Company's financial statements as of December 31 (in millions): 2024 2023 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Cash and cash equivalents $ 8,769 $ 8,769 $ — $ — $ 6,058 $ 6,058 $ — $ — Restricted cash - current (Note 1) 11 11 — — 31 31 — — Restricted cash - non-current (Note 1) 166 166 — — 245 245 — — Short-term investments: U.S. government and agency notes 2,280 — 2,280 — 8,257 — 8,257 — Certificates of deposit placed through an account registry service ("CDARS") 59 — 59 — 73 — 73 — Corporate debt 3,127 — 3,127 — — — — — Other fixed-income securities 240 — 240 — — — — — Long-term investments: Equity securities 71 71 — — 177 177 — — Investments presented in the table above have the same fair value as their carrying value. Short-term investments — T he short-term investments shown in the table above are classified as available-for-sale and have remaining maturities of less than two years. Long-term investments: Equity securities — Represents equity and equity-linked securities (such as vested warrants) that make up United's investments in Azul Linhas Aéreas Brasileiras S.A., Archer Aviation Inc., Eve Holding, Inc., Mesa Air Group, Inc. ("Mesa"). United concluded that Mesa is a variable interest entity as of December 31, 2024. United holds a variable interest in Mesa in the form of an approximately 10% equity interest and several loans to Mesa, but United is not the primary beneficiary because it does not have power to direct the activities that most significantly impact Mesa's economic performance. Other fair value information - The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above as of December 31 (in millions). Carrying amounts include any related discounts, premiums and issuance costs: 2024 2023 Carrying Amount Fair Value Carrying Amount Fair Value Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Long-term debt $ 24,653 $ 24,423 $ — $ 17,300 $ 7,123 $ 29,075 $ 28,302 $ — $ 22,543 $ 5,759 Fair value of the financial instruments included in the tables above was determined as follows: Description Fair Value Methodology Cash and cash equivalents and The carrying amounts of these assets approximate fair value. Short-term and Long-term investments Fair value is based on (a) the trading prices of the investment or similar Long-term debt Fair values are based on either market prices or the discounted amount of future cash flows using our current incremental rate of borrowing for similar liabilities. Equity Method Investments. As of December 31, 2024, United holds investments, accounted for using the equity method, with a combined carrying value of approximately $241 million. Significant equity method investments are described below: • Republic Airways Holdings Inc. United holds a 19% minority interest in Republic Airways Holdings Inc., which is the parent company of Republic Airways Inc. ("Republic"). Republic currently operates 66 regional aircraft under CPAs with United that have terms through 2036. • CommuteAir LLC. United owns a 40% minority ownership stake in CommuteAir LLC. CommuteAir currently operates 57 regional aircraft under a CPA that has a term through 2026. • United Airlines Ventures Sustainable Flight Fund (the "Fund"). United holds, through its corporate venture capital arm, United Airlines Ventures, Ltd., a 33% ownership interest in the Fund. The Fund is an investment vehicle designed to invest in start-ups developing technologies focused on decarbonizing aviation and its associated energy supply chains, including through research and production, and technologies associated with sustainable aviation fuel (SAF). Other Investments. United has equity investments in Abra Group Limited, a multinational airline holding company, JetSuiteX, Inc., an independent air carrier doing business as JSX, as well as a number of companies with emerging technologies and sustainable solutions. None of these investments have readily determinable fair values. We account for these investments at cost less impairment, adjusted for observable price changes in orderly transactions for an identical or similar investment of the same issuer. As of December 31, 2024, the carrying value of these investments was $264 million. Notes Receivable. As of December 31, 2024, the Company has $72 million of notes receivable, net of allowance for credit losses, the majority of which is from certain of its regional carriers. The current portions of the notes receivable are recorded in Receivables, net. The long-term portions of the notes receivable are recorded in Investments in affiliates and other, net on the Company's consolidated balance sheet.

DEBT

DEBT	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
DEBT	DEBT (In millions) Maturity Dates Interest Rate(s) at December 31, 2024 At December 31, 2024 2023 Equipment Notes (a) 2025 — 2037 2.70 % — 6.51 % $ 12,983 $ 12,508 MileagePlus Senior Secured Notes 2027 6.50% 1,900 2,660 MileagePlus Term Loan Faci lity n/a n/a — 2,100 2026 and 2029 Notes 2026 — 2029 4.38 % — 4.63 % 4,000 4,000 2021 Term Loan s n/a n/a — 3,870 2024 Term Loans (b) 2031 6.63% 2,082 — Unsecured Notes 2025 4.88% 315 596 PSP Notes (c) 2030 — 2031 1.00% 3,181 3,181 Other unsecured debt 2027 — 2029 4.00 % — 5.75 % 376 437 24,837 29,352 Less: unamortized debt discount, premiums and debt issuance costs (184) (277) Less: current portion of long-term debt (2,973) (4,018) Long-term debt, net $ 21,680 $ 25,057 (a) Financing includes variable rate debt based on the Secured Overnight Financing Rate ("SOFR") (or another index rate), generally subject to a floor, plus a specified margin of 0.64% to 2.00%. (b) Financing includes variable rate debt based on SOFR (or another index rate), subject to a floor, plus a specified margin of 2.00%. (c) The PSP Notes include $1.50 billion of indebtedness evidenced by a 10-year senior unsecured promissory note with Treasury provided under PSP, $0.9 billion of indebtedness evidenced by a 10-year senior unsecured promissory note issued to Treasury pursuant to PSP2 and $0.8 billion of indebtedness evidenced by a 10-year senior unsecured promissory note issued to Treasury pursuant to PSP3. These PSP Notes have a rate of 1.00% in years 1 through 5, and a rate of the SOFR plus 2.00% in years 6 through 10. The table below presents the Company's contractual principal payments (not including debt discount or debt issuance costs) as of December 31, 2024 under then-outstanding long-term debt agreements (in millions): 2025 2026 2027 2028 2029 After 2029 Total Contractual principal payments $ 2,973 $ 4,793 $ 2,326 $ 1,791 $ 2,892 $ 10,062 $ 24,837 On July 2, 2024, the Company voluntarily prepaid in full the $1.8 billion outstanding principal balance of the secured term loan facility, secured ratably with the MileagePlus Senior Secured Notes, by substantially all of the assets of MPH (the "MileagePlus Term Loan"), in addition to all accrued and unpaid interest and fees under the term loan facility and terminated all commitments thereunder. In 2023, United prepaid $1.0 billion of the outstanding principal amount under the 2021 Term Loans. See Note 13 for information related to charges recorded as a result of these prepayments. On February 15, 2024, the Company entered into an Amended and Restated Revolving Credit and Guaranty Agreement (the "Revolving Credit Facility"), increasing the borrowing capacity by $1.115 billion, bringing the total amount available under the Revolving Credit Facility to $2.865 billion, which may be drawn upon until February 15, 2029, in the case of any Revolving Loans (as defined in the Revolving Credit Facility) made by the Extending Lenders (as defined in the Revolving Credit Facility), and until April 21, 2025, in the case of any Revolving Loans made by the 2024 Non-Extending Lenders (as defined in the Revolving Credit Facility). On April 16, 2024, the Company further increased the revolving loan commitments of the Extending Lenders by $100 million for a total amount available thereunder of $2.965 billion. Following such increase, and after the extension of the maturity of $150 million from April 21, 2025 to February 15, 2029, the revolving loan commitments of the Extending Lenders equal $2.95 billion and the revolving loan commitments of the 2024 Non-Extending Lenders equal $15 million. As of December 31, 2024, we had $2.965 billion undrawn and available under the Revolving Credit Facility. The Revolving Loans, if any, bear interest at a variable rate equal to Term SOFR (as defined in the Revolving Credit Facility), generally subject to a floor, plus a credit adjustment spread described in the Revolving Credit Facility, or, at United's election, another rate based on certain market interest rates, also generally subject to a floor, in each case plus a variable margin ranging from 3.00% to 3.50%, in the case of Term SOFR loans, and 2.00% to 2.50%, in the case of loans at other market rates. On February 22, 2024, the Company also entered into Amendment No. 2 to Term Loan Credit and Guaranty Agreement (as amended, the "Term Loan Facility" and, together with the Revolving Credit Facility, the "2024 Loan Facilities") and (i) used available cash in an amount equal to $1.37 billion to partially prepay the term loans under a 2021 term loan facility and (ii) borrowed the entire term loan commitment available under the Term Loan Facility in an amount equal to $2.5 billion and used the proceeds of such terms loans (the "2024 Term Loans") to prepay in full the remaining outstanding principal balance under the existing term loan facility. The 2024 Term Loans bear interest at a variable rate equal to Term SOFR (subject to a floor of 0.0%); or, at United's election, another rate based on certain market interest rates (subject to a floor of 1.0%), in each case plus a margin of 2.75%, in the case of Term SOFR loans, and 1.75%, in the case of loans at other market rates. The remaining balance of the 2024 Term Loans will mature and be due and payable on February 22, 2031. On November 1, 2024, the Company made an optional prepayment of $400 million on its 2024 Term Loans and lowered its margin to 2.00%, in the case of Term SOFR loans, and 1.00%, in the case of loans at other market rates. The 2024 Loan Facilities are secured on a senior basis by continuing security interests granted by United to the Collateral Trustee for the benefit of the lenders under the 2024 Loan Facilities, among other parties, on the following (the "Collateral"), subject to certain exclusions: (i) all of United's route authorities granted by the U.S. Department of Transportation to operate scheduled service between any international airport located in the United States and any international airport located in any country other than the United States (except Cuba), (ii) United's rights to substantially all of its landing and take-off slots at foreign and domestic airports, including at John F. Kennedy International Airport, LaGuardia Airport and Ronald Reagan Washington National Airport, and (iii) United's rights to use or occupy space at airport terminals, each to the extent necessary at the relevant time for servicing scheduled air carrier service authorized by an applicable route authority. The Collateral securing the 2024 Loan Facilities also presently secures on a senior basis (i) the Company's 4.375% senior secured notes due 2026, and (ii) the Company's 4.625% senior secured notes due 2029. On August 5, 2024, the Company and Wilmington Trust, National Association, as subordination agent and pass through trustee (the "Trustee") under certain pass through trusts newly formed by the Company, entered into the Note Purchase Agreement (the "Note Purchase Agreement"). The Note Purchase Agreement provides for the issuance by the Company of equipment notes (the "Equipment Notes") in the aggregate principal amount of approximately $1.4 billion secured by 48 Boeing aircraft delivered new from the manufacturer from October 2010 to December 2023 (collectively, the "Aircraft"). Pursuant to the Note Purchase Agreement, on August 5, 2024, the Trustee purchased Equipment Notes issued under a trust indenture and mortgage (each, an "Indenture" and, collectively, the "Indentures") with respect to each Aircraft entered into by the Company and Wilmington Trust, National Association, as mortgagee. Each Indenture provides for the issuance of Equipment Notes in two series: Series AA, bearing interest at the rate of 5.450% per annum, and Series A, bearing interest at the rate of 5.875% per annum, in aggregate principal amounts equal to $969 million and $385 million , respectively. The Equipment Notes were purchased by the Trustee, using the proceeds from the sale of Pass Through Certificates, Series 2024-1AA, and Pass Through Certificates, Series 2024-1A, issued by two pass through trusts newly-formed by the Company. The interest on the Equipment Notes is payable semi-annually on each February 15 and August 15, beginning on February 15, 2025. The principal payments on the Equipment Notes are scheduled on February 15 and August 15 of each year, beginning on February 15, 2025 for certain Equipment Notes and August 15, 2025 for the remaining Equipment Notes. The final payments on the Equipment Notes will be due on or prior to February 15, 2037. In addition to the Equipment Notes described above, United borrowed $1.4 billion aggregate principal amount from financial institutions to finance the purchase of aircraft. The notes evidencing these borrowings, which are secured by the related aircraft, mature between 2034 and 2036 and bear interest equal to Term SOFR plus a margin with variable rates ranging from 6.17% to 6.51%.

LEASES

LEASES	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
LEASES	LEASES United leases aircraft, airport passenger terminal space, aircraft hangars and related maintenance facilities, cargo terminals, other airport facilities, other commercial real estate, office and computer equipment and vehicles, among other items. Certain of these leases include provisions for variable lease payments which are based on several factors, including, but not limited to, relative leased square footage, available seat miles, enplaned passengers, passenger facility charges, terminal equipment usage fees, departures, and airports' annual operating budgets. Due to the variable nature of these payments, they are not included in the calculation of the right-of-use asset and lease liability. Lease Cost . The Company's lease cost for the years ended December 31 included the following components (in millions): 2024 2023 2022 Operating lease cost $ 855 $ 925 $ 941 Variable and short-term lease cost 3,592 3,028 2,603 Amortization of finance lease assets 62 52 72 Interest on finance lease liabilities 16 20 13 Sublease income (35) (39) (33) Total lease cost $ 4,490 $ 3,986 $ 3,596 Lease Terms and Commitments . United's leases include aircraft leases for aircraft that are directly leased by United and aircraft that are operated by regional carriers on United's behalf under CPAs (but excluding aircraft owned by United) and non-aircraft leases. Aircraft operating leases relate to leases of 66 mainline and 219 regional aircraft while finance leases relate to leases of 8 mainline and 21 regional aircraft. United's aircraft leases have remaining lease terms of 1 month to 12 years with expiration dates ranging from 2025 through 2036. Under the terms of most aircraft leases, United has the right to purchase the aircraft at the end of the lease term, in some cases at fair market value, and in others, at a percentage of cost. In addition, United also has 66 leases of Boeing 737 MAX, Boeing 787 and Airbus A321neo aircraft under various sale-leaseback transactions. These transactions did not qualify as a sale under the applicable accounting guidance, and, as such, the associated aircraft remain on the Company's consolidated balance sheet as part of Operating property and equipment, net. The related obligations are recorded in Current maturities of long-term debt, finance leases, and other financial liabilities Long-term debt, finance leases, and other financial liabilities Non-aircraft leases have remaining lease terms of 1 month to 32 years. The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases, recorded on the balance sheet, as of December 31, 2024 (in millions): Operating Leases Finance Leases 2025 $ 757 $ 232 2026 731 33 2027 926 21 2028 742 11 2029 546 5 After 2029 3,081 4 Minimum lease payments 6,783 306 Imputed interest (1,806) (15) Present value of minimum lease payments 4,977 291 Less: current maturities of lease obligations (467) (223) Long-term lease obligations $ 4,510 $ 68 The table below presents the Company's future contractual lease payments at December 31, 2024 under then-outstanding sale and leaseback agreements that did not qualify as a sale under the applicable accounting guidance (in millions): Other Financial Liabilities 2025 $ 453 2026 320 2027 610 2028 283 2029 280 After 2029 3,232 5,178 Imputed interest (1,466) Current maturities of other financial liabilities (257) Other financial liabilities $ 3,455 In November 2024, at the request of United, the City of Houston, Texas issued special facility revenue bonds in the par amount of approximately $1.1 billion (the "IAH SFRBs") to fund a portion of the costs of construction, reconfiguration and redevelopment of portions of Terminal B at George Bush Intercontinental Airport. The IAH SFRBs have interest rates ranging from 5.25% to 5.50% per annum, payable semiannually, commencing in July 2025 through the July 2039 maturity date of the IAH SFRBs. United will account for the lease payments related to these IAH SFRBs as an operating lease recognized as a right-of-use asset and lease liability on the Company's balance sheet. As of December 31, 2024, we had entered into leases with rental obligations of approximately $5.7 billion for several mainline aircraft, regional aircraft under CPAs, airport facilities, including the lease associated with the IAH SFRBs described above, and office space, none of which had commenced as of such date. These leases will commence between 2025 and 2027 with lease terms of up to 27 years. Our lease agreements do not provide a readily determinable implicit rate nor is it available to us from our lessors. Instead, we estimate United's incremental borrowing rate based on information available at lease commencement in order to discount lease payments to present value. The table below presents additional information related to our leases as of December 31: 2024 2023 Weighted-average remaining lease term - operating leases 11 years 10 years Weighted-average remaining lease term - finance leases 2 years 2 years Weighted-average remaining lease term - other financial liabilities 10 years 10 years Weighted-average discount rate - operating leases 5.9 % 5.8 % Weighted-average discount rate - finance leases 5.9 % 6.3 % Weighted-average interest rate - other financial liabilities 5.3 % 5.3 % The table below presents supplemental cash flow information related to leases during the year ended December 31 (in millions): 2024 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 851 $ 874 $ 919 Operating cash flows for finance leases 15 21 13 Financing cash flows for finance leases 269 311 124
LEASES	LEASES United leases aircraft, airport passenger terminal space, aircraft hangars and related maintenance facilities, cargo terminals, other airport facilities, other commercial real estate, office and computer equipment and vehicles, among other items. Certain of these leases include provisions for variable lease payments which are based on several factors, including, but not limited to, relative leased square footage, available seat miles, enplaned passengers, passenger facility charges, terminal equipment usage fees, departures, and airports' annual operating budgets. Due to the variable nature of these payments, they are not included in the calculation of the right-of-use asset and lease liability. Lease Cost . The Company's lease cost for the years ended December 31 included the following components (in millions): 2024 2023 2022 Operating lease cost $ 855 $ 925 $ 941 Variable and short-term lease cost 3,592 3,028 2,603 Amortization of finance lease assets 62 52 72 Interest on finance lease liabilities 16 20 13 Sublease income (35) (39) (33) Total lease cost $ 4,490 $ 3,986 $ 3,596 Lease Terms and Commitments . United's leases include aircraft leases for aircraft that are directly leased by United and aircraft that are operated by regional carriers on United's behalf under CPAs (but excluding aircraft owned by United) and non-aircraft leases. Aircraft operating leases relate to leases of 66 mainline and 219 regional aircraft while finance leases relate to leases of 8 mainline and 21 regional aircraft. United's aircraft leases have remaining lease terms of 1 month to 12 years with expiration dates ranging from 2025 through 2036. Under the terms of most aircraft leases, United has the right to purchase the aircraft at the end of the lease term, in some cases at fair market value, and in others, at a percentage of cost. In addition, United also has 66 leases of Boeing 737 MAX, Boeing 787 and Airbus A321neo aircraft under various sale-leaseback transactions. These transactions did not qualify as a sale under the applicable accounting guidance, and, as such, the associated aircraft remain on the Company's consolidated balance sheet as part of Operating property and equipment, net. The related obligations are recorded in Current maturities of long-term debt, finance leases, and other financial liabilities Long-term debt, finance leases, and other financial liabilities Non-aircraft leases have remaining lease terms of 1 month to 32 years. The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases, recorded on the balance sheet, as of December 31, 2024 (in millions): Operating Leases Finance Leases 2025 $ 757 $ 232 2026 731 33 2027 926 21 2028 742 11 2029 546 5 After 2029 3,081 4 Minimum lease payments 6,783 306 Imputed interest (1,806) (15) Present value of minimum lease payments 4,977 291 Less: current maturities of lease obligations (467) (223) Long-term lease obligations $ 4,510 $ 68 The table below presents the Company's future contractual lease payments at December 31, 2024 under then-outstanding sale and leaseback agreements that did not qualify as a sale under the applicable accounting guidance (in millions): Other Financial Liabilities 2025 $ 453 2026 320 2027 610 2028 283 2029 280 After 2029 3,232 5,178 Imputed interest (1,466) Current maturities of other financial liabilities (257) Other financial liabilities $ 3,455 In November 2024, at the request of United, the City of Houston, Texas issued special facility revenue bonds in the par amount of approximately $1.1 billion (the "IAH SFRBs") to fund a portion of the costs of construction, reconfiguration and redevelopment of portions of Terminal B at George Bush Intercontinental Airport. The IAH SFRBs have interest rates ranging from 5.25% to 5.50% per annum, payable semiannually, commencing in July 2025 through the July 2039 maturity date of the IAH SFRBs. United will account for the lease payments related to these IAH SFRBs as an operating lease recognized as a right-of-use asset and lease liability on the Company's balance sheet. As of December 31, 2024, we had entered into leases with rental obligations of approximately $5.7 billion for several mainline aircraft, regional aircraft under CPAs, airport facilities, including the lease associated with the IAH SFRBs described above, and office space, none of which had commenced as of such date. These leases will commence between 2025 and 2027 with lease terms of up to 27 years. Our lease agreements do not provide a readily determinable implicit rate nor is it available to us from our lessors. Instead, we estimate United's incremental borrowing rate based on information available at lease commencement in order to discount lease payments to present value. The table below presents additional information related to our leases as of December 31: 2024 2023 Weighted-average remaining lease term - operating leases 11 years 10 years Weighted-average remaining lease term - finance leases 2 years 2 years Weighted-average remaining lease term - other financial liabilities 10 years 10 years Weighted-average discount rate - operating leases 5.9 % 5.8 % Weighted-average discount rate - finance leases 5.9 % 6.3 % Weighted-average interest rate - other financial liabilities 5.3 % 5.3 % The table below presents supplemental cash flow information related to leases during the year ended December 31 (in millions): 2024 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 851 $ 874 $ 919 Operating cash flows for finance leases 15 21 13 Financing cash flows for finance leases 269 311 124

COMMITMENTS, CONTINGENCIES AND

COMMITMENTS, CONTINGENCIES AND GUARANTEES	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS, CONTINGENCIES AND GUARANTEES	COMMITMENTS, CONTINGENCIES, AND GUARANTEES Purchase Commitments. The table below summarizes United's firm commitments as of December 31, 2024, which include aircraft and related spare engines, aircraft improvements and non-aircraft capital commitments (in billions): 2025 2026 2027 2028 2029 After 2029 Total Purchase commitments $ 9.6 $ 6.0 $ 4.7 $ 6.5 $ 8.1 $ 19.5 $ 54.4 Aircraft commitments included in the table above are based on contractual scheduled aircraft deliveries. The amount and timing of these commitments could change to the extent that: (i) the Company and the aircraft manufacturers, with whom the Company has existing orders for new aircraft, agree to modify (or further modify) the contracts governing those orders, (ii) rights are exercised pursuant to the relevant agreements to cancel deliveries or modify the timing of deliveries, or (iii) the aircraft manufacturers are unable to deliver in accordance with the terms of those orders. Regional CPAs. United has contractual relationships with various regional carriers to provide regional aircraft service branded as United Express. Under these CPAs, the Company pays the regional carriers contractually agreed fees (carrier costs) for operating these flights plus a variable rate adjustment based on agreed performance metrics, subject to annual adjustments. The fees are based on specific rates multiplied by specific operating statistics (e.g., block hours, departures), as well as fixed monthly amounts. Under these CPAs, the Company is also responsible for all fuel costs incurred, as well as landing fees and other costs, which are either passed through by the regional carrier to the Company without any markup or directly incurred by the Company. In some cases, the Company owns some or all of the aircraft subject to the CPA and leases such aircraft to the regional carrier. United's CPAs are for 412 regional aircraft as of December 31, 2024, and the CPAs have terms expiring through 2036. Aircraft operated under CPAs include aircraft leased directly from the regional carriers and those owned by United and operated by the regional carriers. United recorded approximately $1.1 billion, $1.1 billion and $0.9 billion in expenses related to its CPAs with its regional carriers in which United is a minority shareholder, for the years ended December 31, 2024, 2023 and 2022, respectively. United had prepaid assets and accounts and notes receivables with combined carrying values of $52 million and $84 million with these companies, as of December 31, 2024 and 2023, respectively. There were $110 million and $122 million of liabilities due to these companies as of December 31, 2024 and 2023, respectively. The CPAs with these related parties were executed in the ordinary course of business. Our future commitments under our CPAs are dependent on numerous variables, and are, therefore, difficult to predict. The most important of these variables is the number of scheduled block hours. Although we are not required to purchase a minimum number of block hours under certain of our CPAs, we have set forth below estimates of our future payments under the CPAs based on our assumptions. The actual amounts we pay to our regional operators under CPAs could differ materially from these estimates. United's estimates of its future payments under all of the CPAs do not include the portion of the underlying obligation for any aircraft leased to a regional carrier or deemed to be leased from other regional carriers and facility rent that are disclosed as part of operating leases in Note 11. For purposes of calculating these estimates, we have assumed (1) the number of block hours flown is based on our anticipated level of flight activity or at any contractual minimum utilization levels if applicable, whichever is higher, (2) that we will reduce the fleet as rapidly as contractually allowed under each CPA, (3) that aircraft utilization, stage length and load factors will remain constant, (4) that each carrier's operational performance will remain at recent historic levels and (5) an annual projected inflation rate. These amounts exclude variable pass-through costs such as fuel and landing fees, among others. Based on these assumptions as of December 31, 2024, our estimated future payments through the end of the terms of our CPAs are presented in the table below (in billions): 2025 2026 2027 2028 2029 After 2029 Total Future commitments under CPAs $ 2.7 $ 2.8 $ 2.1 $ 1.8 $ 1.4 $ 4.1 $ 14.9 As of December 31, 2024, United had 207 call options to purchase regional jet aircraft being operated by certain of its regional carriers with contract dates extending until 2036. These call options are exercisable upon wrongful termination or breach of contract, among other conditions. Legal and Environmental. The Company has certain contingencies resulting from litigation and claims incident to the ordinary course of business. As of December 31, 2024, management believes, after considering a number of factors, including (but not limited to) the information currently available, the views of legal counsel, the nature of contingencies to which the Company is subject and prior experience, that its defenses and assertions in pending legal proceedings have merit and t he ultimate disposition of any pending matter will not materially affect the Company's financial position, results of operations or cash flows. The Company records liabilities for legal and environmental claims when it is probable that a loss has been incurred and the amount is reasonably estimable. These amounts are recorded based on the Company's assessments of the likelihood of their eventual disposition. Guarantees and Indemnifications. In the normal course of business, the Company enters into numerous real estate leasing and aircraft financing arrangements that have various guarantees included in the contracts. These guarantees are primarily in the form of indemnities under which the Company typically indemnifies the lessors and any tax/financing parties against liabilities that arise out of or relate to the use, operation or maintenance of the leased premises or financed aircraft. Currently, the Company believes that any future payments required under these guarantees or indemnities would be immaterial, as most liabilities and related indemnities are covered by insurance (subject to deductibles). Additionally, certain real estate leases include indemnities for any environmental liability that may arise out of or relate to the use of the leased premises. As of December 31, 2024, United is the guarantor of approximately $2.9 billion in aggregate principal amount of tax-exempt special facility revenue bonds and interest thereon. These bonds, which in most instances are issued by various airport municipalities, are payable solely from rentals paid under long-term agreements with the respective governing bodies. The leasing arrangements associated with these obligations are accounted for as operating leases and the related obligations are included in our lease related disclosures in Note 11. All of these bonds mature between 2027 and 2041. As of December 31, 2024, United had $396 million of surety bonds securing various insurance related obligations with expiration dates through 2028. Increased Cost Provisions. In United's financing transactions that include loans in which United is the borrower, United typically agrees to reimburse lenders for any reduced returns with respect to the loans due to any change in capital requirements and, in the case of loans with respect to which the interest rate is based on SOFR, for certain other increased costs that the lenders incur in carrying these loans as a result of any change in law, subject, in most cases, to obligations of the lenders to take certain limited steps to mitigate the requirement for, or the amount of, such increased costs. At December 31, 2024, the Company had $8.5 billion of floating rate debt with remaining terms of up to approximately 12 years that are subject to these increased cost provisions. In several financing transactions involving loans from non-U.S. entities, with remaining terms of up to approximately 12 years and an aggregate balance of $5.3 billion, the Company bears the risk of any change in tax laws that would subject loan payments thereunder to non-U.S. entities to withholding taxes, subject to customary exclusions. Fuel Consortia. United participates in numerous fuel consortia with other air carriers at major airports to reduce the costs of fuel distribution and storage. Interline agreements govern the rights and responsibilities of the consortia members and provide for the allocation of the overall costs to operate the consortia based on usage. The consortia (and in limited cases, the participating carriers) have entered into long-term agreements to lease certain airport fuel storage and distribution facilities that are typically financed through various debt obligations. In general, each consortium lease agreement requires the consortium to make lease payments in amounts sufficient to pay the maturing principal and interest payments on these debt obligations. As of December 31, 2024, approximately $2.7 billion principal amount of such loans was secured by significant fuel facility leases in which United participates, as to which United and each of the signatory airlines has provided indirect guarantees of the debt. As of December 31, 2024, the Company's contingent exposure was approximately $504 million principal amount of such obligations based on its recent consortia participation. The Company's contingent exposure could increase if the participation of other air carriers decreases. The guarantees will expire when these obligations are paid in full, which ranges from 2027 to 2056. The Company concluded it was not necessary to record a liability for these indirect guarantees. Credit Card Processing Agreements. The Company has agreements with financial institutions that process customer credit card transactions for the sale of air travel and other services. Under certain of the Company's credit card processing agreements, the financial institutions in certain circumstances have the right to require that the Company maintain a reserve equal to a portion of advance ticket sales that has been processed by that financial institution, but for which the Company has not yet provided the air transportation. Such financial institutions may require additional cash or other collateral reserves to be established or additional withholding of payments related to receivables collected if the Company does not maintain certain minimum levels of unrestricted cash, cash equivalents and short-term investments (collectively, "Unrestricted Liquidity"). The Company's current level of Unrestricted Liquidity is substantially in excess of these minimum levels. Labor Negotiations. As of December 31, 2024, United, including its subsidiaries, had approximately 107,300 employees. Approximately 82% of United's employees were represented by various U.S. labor organizations.

SPECIAL CHARGES

SPECIAL CHARGES	12 Months Ended
	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
SPECIAL CHARGES	SPECIAL CHARGES For the years ended December 31, operating and nonoperating special charges and unrealized (gains) losses on investments in the statements of consolidated operations consisted of the following (in millions): 2024 2023 2022 (Gains) losses on sale of assets and other special charges $ 112 $ 135 $ 140 Labor contract ratification bonuses — 814 — Total operating special charges 112 949 140 Nonoperating unrealized (gains) losses on investments, net 199 (27) (20) Nonoperating debt extinguishment and modification fees 128 11 7 Total nonoperating special charges and unrealized (gains) losses on investments, net 327 (16) (13) Total operating and nonoperating special charges and unrealized (gains) losses on investments, net 439 933 127 Income tax benefit, net of valuation allowance (54) (214) (33) Total operating and nonoperating special charges and unrealized (gains) losses on investments, net of income taxes $ 385 $ 719 $ 94 Operating and nonoperating special charges and unrealized (gains) losses on investments included the following: During 2024, the Company recorded $128 million of charges related to the prepayment in full of the outstanding principal balance of the MileagePlus Term Loan in July 2024, the refinancing of its 2021 term loans in February 2024 and a partial prepayment of the 2024 Term Loans. During 2023, the Company recorded $814 million of expense associated with the agreements with its employees represented by the Air Line Pilots Association, the International Association of Machinists and Aerospace Workers and other labor unions.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net income	$ 3,149	$ 2,618	$ 737

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Cybersecurity Risk Management a

Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	The Company established a risk-based strategy informed by guiding principles from industry standard cybersecurity and risk management frameworks, such as those published by the National Institute of Standards and Technology. The Company's cybersecurity risk management framework is integrated with the Company's Enterprise Risk Management ("ERM") process that is subject to oversight by the Board. Cybersecurity risks are one of the key risks regularly evaluated, assessed and monitored as part of the Company's overall ERM process. As part of its risk-based strategy, the Company maintains appropriate technical and organizational measures and regularly reviews the appropriateness of those controls based on changes to the technical or regulatory environment. The Company also regularly incorporates cybersecurity awareness training into employee communications, engagement and training activities. The Company participates in various information-sharing organizations to timely share and receive threat information, thereby improving the collective defense of the aviation, retail and hospitality and other critical infrastructure sectors. The Company regularly seeks opportunities to improve its capabilities, including through cybersecurity trainings and skill development programs for its CDR members. The Company utilizes a variety of third parties in connection with its cybersecurity risk management. The Company also employs third-party cybersecurity companies to add capacity or expertise when necessary. Additionally, assessments of the Company's cybersecurity program are periodically conducted by independent third-party assessors. The Company is subject to cybersecurity risks related to its business partners and third-party service providers, as further detailed under the heading "Increasing privacy, data security and cybersecurity obligations or a significant data breach may adversely affect the Company's business" included as part of the risk factor disclosures in Part I, Item 1A. of this report. To manage these risks, the Company considers the impact of third-party incidents as part of its cybersecurity incident response processes. The Company also conducts evaluations of key suppliers based on risk and seeks to incorporate appropriate security standards to manage the risk. The Company also regularly monitors the external cybersecurity posture of select third parties through various service providers. Crucially, the Company and its suppliers strive to design and implement technical and organizational controls comprehensively, consistently and effectively as intended to protect the confidentiality, integrity or availability of systems and data. However, because the Company utilizes a risk-based strategy, based on professional judgment and analysis of the risks, it is possible that the Company may underappreciate or not recognize a specific risk. Moreover, even the best designed and implemented security controls may not eliminate the occurrence of cybersecurity incidents. Cybersecurity Incident Management The CDR organization uses a variety of prevention and detection tools and other resources to identify potential cybersecurity incidents. When a cybersecurity incident is identified, CDR's incident response team engages with the appropriate subject matter experts, the relevant management of impacted organization(s) and others to analyze, contain, eradicate, mitigate and recover from the incident as applicable. When appropriate, during the incident response process, the CISO, CDR leadership and the Company's Chief Legal Officer may be informed and consulted and if deemed necessary, incidents may be escalated for review by the Senior Leader Crisis Team, which consists of cross-functional leaders of the Company. The Company maintains a process in which a subgroup of the Company's Disclosure Council would make a recommendation regarding the materiality of a cybersecurity incident to the full Disclosure Council and subsequently to the Audit Committee. Additionally, the CDR organization has frequent operating rhythms to, among other things, review cybersecurity incidents and track the progress of cybersecurity initiatives.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	The Company established a risk-based strategy informed by guiding principles from industry standard cybersecurity and risk management frameworks, such as those published by the National Institute of Standards and Technology. The Company's cybersecurity risk management framework is integrated with the Company's Enterprise Risk Management ("ERM") process that is subject to oversight by the Board. Cybersecurity risks are one of the key risks regularly evaluated, assessed and monitored as part of the Company's overall ERM process.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	The Company considers management of cybersecurity and digital risk as essential for enabling success. The Audit Committee (the "Audit Committee") of the Board provides oversight of the Company's risk assessment and risk management policies and strategies with respect to significant business risks, including cybersecurity and digital risk. On a regular basis, the Audit Committee reviews reports from the Company's Chief Information Security Officer ("CISO") or her representative(s) regarding the identification and management of cybersecurity risks, including when applicable, notable cybersecurity threats or incidents impacting the aviation sector and the Company; results of independent third-party assessments of the Company's cybersecurity program; key metrics, capabilities, resourcing and strategy regarding the Company's cybersecurity program; and updates related to cybersecurity regulatory developments.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Audit Committee (the "Audit Committee") of the Board provides oversight of the Company's risk assessment and risk management policies and strategies with respect to significant business risks, including cybersecurity and digital risk.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	On a regular basis, the Audit Committee reviews reports from the Company's Chief Information Security Officer ("CISO") or her representative(s) regarding the identification and management of cybersecurity risks, including when applicable, notable cybersecurity threats or incidents impacting the aviation sector and the Company; results of independent third-party assessments of the Company's cybersecurity program; key metrics, capabilities, resourcing and strategy regarding the Company's cybersecurity program; and updates related to cybersecurity regulatory developments.
Cybersecurity Risk Role of Management [Text Block]	The Company considers management of cybersecurity and digital risk as essential for enabling success. The Audit Committee (the "Audit Committee") of the Board provides oversight of the Company's risk assessment and risk management policies and strategies with respect to significant business risks, including cybersecurity and digital risk. On a regular basis, the Audit Committee reviews reports from the Company's Chief Information Security Officer ("CISO") or her representative(s) regarding the identification and management of cybersecurity risks, including when applicable, notable cybersecurity threats or incidents impacting the aviation sector and the Company; results of independent third-party assessments of the Company's cybersecurity program; key metrics, capabilities, resourcing and strategy regarding the Company's cybersecurity program; and updates related to cybersecurity regulatory developments. The CISO leads the Company's Cybersecurity and Digital Risk ("CDR") organization, which oversees the Company's approach to identifying and managing cybersecurity and digital risk. The Company's current CISO has extensive technology and risk management experience in critical infrastructure sectors and is qualified as a boardroom certified technology expert by the Digital Directors Network. She has served on the U.S. President's National Infrastructure Advisory Council, examining and providing recommendations related to cross-sector critical infrastructure security and resilience. She serves on the board of directors of the Internet Security Alliance, is currently a member of the Cybersecurity Council at Airlines for America (and has served as Chair) and is currently a member of the board of directors of the Aviation Information Sharing and Analysis Center (A-ISAC). The CDR organization includes teams focusing on cyber defense, identity & digital trust, secure product solutions & aircraft cybersecurity operations. The teams include individuals with a variety of cybersecurity expertise, including expertise in penetration testing; application cybersecurity; product cybersecurity; cloud cybersecurity; infrastructure cybersecurity; cybersecurity engineering and architecture; identity and access management; vulnerability and asset management; cybersecurity threat intelligence; cybersecurity regulatory compliance; digital fraud; digital trust; incident response; insider threat assessment; and aircraft cybersecurity. The Company's senior leadership, including across the functions of the Company's safety, legal, government affairs, operations, aviation security, finance, communications and digital technology as well as others when appropriate, support CDR and contribute to the management of cybersecurity and digital risk by attending regular cybersecurity risk reviews and participating in cybersecurity exercises.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The CISO leads the Company's Cybersecurity and Digital Risk ("CDR") organization, which oversees the Company's approach to identifying and managing cybersecurity and digital risk.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	The Company's current CISO has extensive technology and risk management experience in critical infrastructure sectors and is qualified as a boardroom certified technology expert by the Digital Directors Network. She has served on the U.S. President's National Infrastructure Advisory Council, examining and providing recommendations related to cross-sector critical infrastructure security and resilience. She serves on the board of directors of the Internet Security Alliance, is currently a member of the Cybersecurity Council at Airlines for America (and has served as Chair) and is currently a member of the board of directors of the Aviation Information Sharing and Analysis Center (A-ISAC).
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	On a regular basis, the Audit Committee reviews reports from the Company's Chief Information Security Officer ("CISO") or her representative(s) regarding the identification and management of cybersecurity risks, including when applicable, notable cybersecurity threats or incidents impacting the aviation sector and the Company; results of independent third-party assessments of the Company's cybersecurity program; key metrics, capabilities, resourcing and strategy regarding the Company's cybersecurity program; and updates related to cybersecurity regulatory developments. The CISO leads the Company's Cybersecurity and Digital Risk ("CDR") organization, which oversees the Company's approach to identifying and managing cybersecurity and digital risk. The Company's current CISO has extensive technology and risk management experience in critical infrastructure sectors and is qualified as a boardroom certified technology expert by the Digital Directors Network. She has served on the U.S. President's National Infrastructure Advisory Council, examining and providing recommendations related to cross-sector critical infrastructure security and resilience. She serves on the board of directors of the Internet Security Alliance, is currently a member of the Cybersecurity Council at Airlines for America (and has served as Chair) and is currently a member of the board of directors of the Aviation Information Sharing and Analysis Center (A-ISAC). The CDR organization includes teams focusing on cyber defense, identity & digital trust, secure product solutions & aircraft cybersecurity operations. The teams include individuals with a variety of cybersecurity expertise, including expertise in penetration testing; application cybersecurity; product cybersecurity; cloud cybersecurity; infrastructure cybersecurity; cybersecurity engineering and architecture; identity and access management; vulnerability and asset management; cybersecurity threat intelligence; cybersecurity regulatory compliance; digital fraud; digital trust; incident response; insider threat assessment; and aircraft cybersecurity. The Company's senior leadership, including across the functions of the Company's safety, legal, government affairs, operations, aviation security, finance, communications and digital technology as well as others when appropriate, support CDR and contribute to the management of cybersecurity and digital risk by attending regular cybersecurity risk reviews and participating in cybersecurity exercises.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

BASIS OF PRESENTATION AND SIG_2

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation United Airlines Holdings, Inc. (together with its consolidated subsidiaries, "UAL" or the "Company") is a holding company incorporated in Delaware and its wholly-owned subsidiary is United Airlines, Inc. (together with its consolidated subsidiaries, "United"). As UAL consolidates United for financial statement purposes, disclosures that relate to activities of United also apply to UAL, unless otherwise noted. United comprises substantially all of UAL's operating revenues, operating expenses, assets, liabilities and operating cash flows. When appropriate, UAL and United are named specifically for their individual contractual obligations and related disclosures and any significant differences between the operations and results of UAL and United are separately disclosed and explained. The Company’s consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). The Company consolidates variable interest entities where it has been determined that the Company is the primary beneficiary of those entities' operations. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain prior period amounts have been reclassified to conform to the current period presentation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. Actual results could differ from those estimates.
Segments	Segments Operating segments are defined as components of an enterprise with separate financial information, which are evaluated regularly by the chief operating decision maker ("CODM") and are used in resource allocation and performance assessments. T he Company manages it operations as one segment. Managing the Company as one segment allows management the opportunity to maximize the value of its route network and maximize the Company's consolidated financial results. The Company deploys its aircraft across its route network through a single route scheduling system to maximize its value. The Company's chief executive officer is its CODM. When making resource allocation decisions for the network, the Company's CODM evaluates flight profitability data, which considers aircraft type and route economics. The CODM assesses performance of the Company and makes resource allocation decisions based on net income as reported in the Company's statement of consolidated operations. The measure of segment assets is reported on the consolidated balance sheet as Total assets. Within the statement of consolidated operations, Other expenses represent various purchased services related to the operations of the airline such as ground handling, passenger services, food and beverage offerings, navigation fees, personnel-related costs and information technology projects.
Cash and Cash Equivalents and Restricted Cash	Cash and Cash Equivalents and Restricted Cash. Highly liquid investments with a maturity of three months or less on their acquisition date are classified as cash and cash equivalents. Restricted cash is classified as current or noncurrent in the consolidated balance sheets based on the expected timing of return of the assets to the Company or payment to an outside party. The restricted cash balances primarily include collateral associated with the senior secured notes (the "MileagePlus Senior Secured Notes") secured by substantially all of the assets of Mileage Plus Holdings, LLC ("MPH"), a direct wholly-owned subsidiary of United, collateral for letters of credit and collateral associated with facility leases and certain insurance-related obligations.
Investments	Investments. Highly liquid investments with maturities of greater than three months, but not beyond one year, at the time of purchase are classified as short-term investments and are stated at fair value. Investments with maturities beyond one year when purchased are classified as short-term investments if they are expected to be available to support our short-term liquidity needs. Our short-term investments in debt securities are classified as available-for-sale and are stated at fair value. Realized gains and losses on sales of these investments are reflected in Interest income in the statements of consolidated operations. Unrealized gains and losses on available-for-sale debt securities are reflected as a component of accumulated other comprehensive income (loss). Equity investments are accounted for under the equity method if we are able to exercise significant influence over the investee. Equity investments for which we do not have significant influence are recorded at fair value or at cost, if fair value is not readily determinable, with adjustments for observable changes in price or impairments (referred to as the measurement alternative). Changes in fair value are recorded in Unrealized gains (losses) on investments, net in the statements of consolidated operations. See Note 9 of this report for additional information related to investments.
Accounts Receivable	Accounts Receivable.
Aircraft Fuel, Spare Parts and Supplies	Aircraft Fuel, Spare Parts and Supplies.
Property and Equipment	Property and Equipment. The Company records additions to owned operating property and equipment at cost when acquired. Costs related to modifications that enhance the operating performance or extend the useful lives of airframes or engines are capitalized as property and equipment. We periodically receive credits in connection with the acquisition of aircraft and engines as well as contractual damages related to delays in delivery or operating performance issues. These credits are generally deferred and are recognized as a reduction to the cost of the related equipment.
Leases	Leases. The Company enters into various leases as a lessee for assets including, but not limited to, airport facilities, airport gates, hanger sites, administrative offices, aircraft, and various other facilities and equipment to support its operations. The Company determines if an arrangement contains a lease at inception. A lease exists when the arrangement conveys the right to control the use of an identified asset over the lease term. Upon lease commencement, the Company records a lease liability for the obligation to make lease payments and right-of-use ("ROU") asset for the right to use the underlying asset for the lease term in the consolidated balance sheets. The lease liability is measured at the commencement date based on the present value of lease payments not yet paid over the lease term, which includes extension and renewal options that are reasonably certain of being exercised, discounted using an incremental borrowing rate that reflects the term of the lease and the particular economic environment at lease commencement. The ROU asset is based on the lease liability, adjusted for lease prepayments, lease incentives received, and the lessee's initial direct costs. The Company does not record a right-of-use asset or lease liability for leases with an initial term of 12 months or less. Lease and non-lease components are combined for all classes of underlying assets, except for capacity purchase agreements ("CPAs") which contain embedded leases for regional aircraft. For these CPAs, the Company allocates consideration to the lease and non-lease components based on their relative standalone values. Many of the Company's leases include variable lease payments, which are not included in the measurement of the right-of-use asset and lease liability. Finance lease right-of-use assets are presented together with Operating property and equipment on the consolidated balance sheets and the related amortization is included in Depreciation and amortization expense.
Long-Lived Asset Impairments	Long-Lived Asset Impairments. The Company evaluates the carrying value of long-lived assets subject to amortization whenever events or changes in circumstances indicate that an impairment may exist. For purposes of this testing, the Company has generally identified the aircraft fleet type as the lowest level of identifiable cash flows for its mainline fleet and the contract level for its regional fleet under CPAs. An impairment charge is recognized when the asset's carrying value exceeds its net undiscounted future cash flows. The amount of the charge is the difference between the asset's carrying value and fair market value.
Intangibles Assets	Intangible Assets. The Company has finite-lived and indefinite-lived intangible assets, including goodwill. Finite-lived intangible assets are amortized over their estimated useful lives. Goodwill and indefinite-lived intangible assets are not amortized but are assessed for impairment on an annual basis as of October 1, or more frequently if events or circumstances indicate that the asset may be impaired. The Company typically determines fair value using either market or a variation of the income approach valuation techniques. These measurements include the following key assumptions: (1) forecasted revenues, expenses, margin and cash flows, (2) terminal period growth rate, (3) an estimated weighted average cost of capital, (4) asset-specific risk factor and (5) a tax rate. These assumptions are consistent with those that hypothetical market participants would use. We recognize an impairment when the fair value of an intangible asset is less than its carrying value. For the Company's China route authority, the Company performed a quantitative assessment which involved determining the fair value of the asset and comparing that amount to the asset's carrying value. For all other intangible assets, the Company performed a qualitative assessment of whether it was more likely than not that an impairment had occurred. To determine fair value of the China route authority, the Company used a discounted cash flow method. Key assumptions used in the valuation model included forecasted revenues, margin and an overall discount rate. These assumptions are inherently uncertain as they relate to future events and circumstances.
Labor Costs	Labor Costs. The Company records expenses associated with new or amendable labor agreements when the amounts are probable and estimable. These could include costs associated with retro-active lump sum cash payments made in conjunction with the ratification of labor agreements. To the extent these upfront costs are in lieu of future pay increases, they would be capitalized and amortized over the term of the labor agreements. If not, these amounts would be expensed.
Share-Based Compensation	Share-Based Compensation. The Company measures the cost of employee services received in exchange for an award of equity instruments based on the grant date fair value of the award. The resulting cost is recognized over the period during which an employee is required to provide service in exchange for the award, which is usually the vesting period. Obligations for cash-settled restricted stock units ("RSUs") are remeasured at fair value throughout the requisite service period at the close of the reporting period based upon UAL's stock price. In addition to the service requirement, certain RSUs have performance metrics that must be achieved prior to vesting. These awards are accrued based on the expected level of achievement at each reporting period. An adjustment is recorded each reporting period to adjust compensation expense based on the then current level of expected performance achievement for the performance-based awards. See Note 5 of this report for additional information on UAL's share-based compensation plans.
Maintenance and Repairs	Maintenance and Repairs . The cost of maintenance and repairs, including the cost of minor replacements, is charged to expense as incurred, except for costs incurred under our power-by-the-hour ("PBTH") engine maintenance agreements. PBTH contracts transfer certain risk to third-party service providers and fix the amount we pay per flight hour or per cycle to the service provider in exchange for maintenance and repairs under a predefined maintenance program. Under PBTH agreements, the Company recognizes expense at a level rate per engine hour, unless the level of service effort and the related payments during the period are substantially consistent, in which case the Company recognizes expense based on the amounts paid.
Advertising	Advertising.
Third-Party Business	Third-Party Business. The Company has third-party business activity that includes ground handling, maintenance services, flight academy and frequent flyer award non-travel redemptions. Third-party business revenue is recorded in Other operating revenue. Expenses associated with these third-party business activities are recorded in Other operating expenses, except for non-travel mileage redemption. Non-travel mileage redemption expenses are recorded to Other operating revenue.
Uncertain Income Tax Positions	Uncertain Income Tax Positions. The Company has recorded reserves for income taxes and associated interest that may become payable in future years. Although management believes that its positions taken on income tax matters are reasonable, the Company nevertheless established tax and interest reserves in recognition that various taxing authorities may challenge certain of the positions taken by the Company, potentially resulting in additional liabilities for taxes and interest. The Company's uncertain tax position reserves are reviewed periodically and are adjusted as events occur that affect its estimates, such as the
Fair Value Measurements	Fair Value Measurements. The Company measures certain financial assets and liabilities at fair value on a recurring basis, and certain non-financial assets and liabilities on a nonrecurring basis. The Company uses valuation techniques to measure fair value that maximize the use of observable inputs and minimize the use of unobservable inputs. These inputs are prioritized as follows: • Level 1 - Unadjusted quoted prices in active markets for assets or liabilities identical to those to be reported at fair value • Level 2 - Other inputs that are observable directly or indirectly, such as quoted prices for similar assets or liabilities or market-corroborated inputs •
Recently Issued Accounting Standards	Recently Issued Accounting Standards Income Taxes. In December 2023, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures." This ASU enhances disclosures related to income taxes, including the rate reconciliation and information on income taxes paid. This ASU becomes effective for us on January 1, 2025. We are assessing the impact of this ASU and upon adoption may be required to include certain additional disclosures. Expense Disaggregation. In November 2024, the FASB issued ASU No. 2024-03, "Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses." This ASU requires disclosing disaggregated information about certain income statement expense captions but does not change the presentation of expense information or expense captions reported on the face of the income statement. This ASU is effective for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027; early adoption is permitted. We are assessing the impact of this ASU and upon adoption may be required to include certain additional disclosures.
Revenue Recognition	Passenger Revenue . Passenger revenue is recognized when transportation is provided. Passenger tickets and related ancillary services sold by the Company for flights are purchased primarily via credit card transactions, with payments collected by the Company in advance of the performance of related services. The Company initially records ticket sales in its Advance ticket sales liability, deferring revenue recognition until the travel occurs. For travel that has more than one flight segment, the Company deems each segment as a separate performance obligation and recognizes revenue for each segment as travel occurs. Tickets sold by other airlines where the Company provides the transportation are recognized as passenger revenue at the estimated value to be billed to the other airline when travel is provided. Differences between amounts billed and the actual amounts may be rejected and rebilled or written off if the amount recorded was different from the original estimate. When necessary, the Company records a reserve against its billings and payables with other airlines based on historical experience. The Company sells certain tickets with connecting flights with one or more segments operated by its other airline partners. For segments operated by its other airline partners, the Company has determined that it is acting as an agent on behalf of the other airlines as they are responsible for their portion of the contract (i.e. transportation of the passenger). The Company, as the agent, recognizes revenue within Other operating revenue at the time of the travel for the net amount representing commission to be retained by the Company for any segments flown by other airlines. Refundable tickets expire after one year from the date of issuance. Non-refundable tickets generally expire on the date of the intended travel, unless the date is extended by notification from the customer on or before the intended travel date. United initially capitalizes the costs of selling airline travel tickets and then recognizes those costs as Distribution expense at the time of travel. Costs to sell a ticket include credit card fees, travel agency and other commissions paid, as well as global distribution systems booking fees. Advance ticket sales. Advance ticket sales represent the Company's liability to provide air transportation in the future. All tickets sold at any given point in time have travel dates through the next 12 months. The Company defers amounts related to future travel in its Advance ticket sales liability account. Estimate of tickets not expected to be used ("ticket breakage"). The Company estimates the value of Advance ticket sales that will expire unused and recognizes revenue and any changes in estimates in proportion to the usage of the related tickets. To determine ticket breakage, the Company uses its historical experience with expired tickets and certificates and other facts, such as recent aging trends, program changes and modifications that could affect the ultimate expiration patterns. The Company attributes revenue among the geographic areas based upon the origin and destination of each flight segment. The Company's operations involve an insignificant level of revenue-producing assets in geographic regions as the overwhelming majority of the Company's revenue-producing assets (primarily U.S. registered aircraft) can be deployed in any of its geographic regions. Ancillary services. Cargo Revenue.
Ticket Taxes	Ticket Taxes.
Frequent Flyer Accounting	Frequent Flyer Program . United's MileagePlus loyalty program builds customer loyalty by offering awards, benefits and services to program participants. Members in this program earn miles for travel on United, United Express, Star Alliance members and certain other airlines that participate in the program. Members can also earn miles by purchasing goods and services from our network of non-airline partners. We have contracts to sell miles to these partners with the terms extending from approximately one Miles earned in conjunction with travel. When frequent flyers earn miles for flights, the Company recognizes a portion of the ticket sales as revenue when the travel occurs and defers a portion of the ticket sale representing the value of the related miles as a separate performance obligation. The Company determines the estimated selling price of travel and miles as if each element is sold on a separate basis. The total consideration from each ticket sale is then allocated to each of these elements, individually, on a pro-rata basis. At the time of travel, the Company records the portion allocated to the miles to Frequent flyer deferred revenue on the Company's consolidated balance sheet and subsequently recognizes it into revenue when miles are redeemed for air travel and non-air travel awards. Estimate of miles not expected to be redeemed ("breakage") . The Company's breakage model is based on the assumption that the likelihood that an account will redeem its miles can be estimated based on a consideration of the account's historical behavior. The Company uses a statistical model to estimate the probability that an account will redeem its current miles balance and reviews its breakage estimates annually. The Company's estimate of the expected breakage of miles requires management judgment. Changes to breakage assumptions, or to program rules and program redemption opportunities, may result in material changes to the deferred revenue balance as well as recognized revenues from the program. We recognize breakage proportionally as the remaining miles are redeemed. Estimated selling price of miles . The Company's estimated selling price of miles is based on an equivalent ticket value, which incorporates the expected redemption of miles, as the best estimate of selling price for these miles. The equivalent ticket value is based on the prior 12 months' weighted average equivalent ticket value of similar fares as those used to settle award redemptions while taking into consideration such factors as redemption pattern, cabin class, loyalty status and geographic region. The estimated selling price of miles is adjusted by breakage that considers a number of factors, including redemption patterns of various customer groups. Co-Brand agreement . United's most significant contract to sell MileagePlus miles is with its co-branded credit card partner JPMorgan Chase Bank USA, N.A. ("Chase"). Chase awards miles to MileagePlus members based on their credit card activity. United identified the following significant separately identifiable performance obligations in this contract (the "Co-Brand Agreement"): • MileagePlus miles awarded – United has a performance obligation to provide MileagePlus cardholders with miles to be used for air travel and non-travel award redemptions. The Company records Passenger revenue related to the travel awards when the transportation is provided and records Other operating revenue related to the non-travel awards when the goods or services are delivered. The Company records the cost associated with non-travel awards in Other operating revenue, as an agent. • Marketing – United has a performance obligation to provide Chase access to United's customer list and the use of United's brand. Marketing revenue is recorded to Other operating revenue as miles are delivered to Chase. • Advertising – United has a performance obligation to provide advertising in support of the MileagePlus card in various customer contact points such as United's website, email promotions, direct mail campaigns, airport advertising and in-flight advertising. Advertising revenue is recorded to Other operating revenue as miles are delivered to Chase. • Other travel-related benefits – United's performance obligations are comprised of various items such as waived bag fees, seat upgrades and lounge passes. Lounge passes are recorded to Other operating revenue as customers use the lounge passes. Bag fees and seat upgrades are recorded to Passenger revenue at the time of the associated travel. We account for all the payments received under the Co-Brand Agreement by allocating them to the separately identifiable performance obligations. The fair value of the separately identifiable performance obligations is determined using management's estimated selling price of each component. The objective of using the estimated selling price based methodology is to determine the price at which we would transact a sale if the product or service were sold on a stand-alone basis. Accordingly, we determine our best estimate of selling price by considering multiple inputs and methods including, but not limited to, discounted cash flows, brand value, volume discounts, published selling prices, number of miles awarded and number of miles redeemed. The Company estimated the selling prices and volumes over the term of the Co-Brand Agreement, at the inception of the contract, in order to determine the allocation of proceeds to each of the components to be delivered. Frequent flyer deferred revenue.

BASIS OF PRESENTATION AND SIG_3

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Reconciliation of Cash, Cash Equivalents and Restricted Cash	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of consolidated cash flows (in millions): At December 31, 2024 2023 2022 Current assets: Cash and cash equivalents $ 8,769 $ 6,058 $ 7,166 Restricted cash in Prepaid expenses and other 11 31 45 Noncurrent assets: Restricted cash in Investments in affiliates and other, net 166 245 210 Total cash, cash equivalents and restricted cash $ 8,946 $ 6,334 $ 7,421
Reconciliation of Cash, Cash Equivalents and Restricted Cash	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of consolidated cash flows (in millions): At December 31, 2024 2023 2022 Current assets: Cash and cash equivalents $ 8,769 $ 6,058 $ 7,166 Restricted cash in Prepaid expenses and other 11 31 45 Noncurrent assets: Restricted cash in Investments in affiliates and other, net 166 245 210 Total cash, cash equivalents and restricted cash $ 8,946 $ 6,334 $ 7,421
Operating Property and Equipment, Net	The estimated useful lives of property and equipment are as follows: Estimated Useful Life (in years) Aircraft, spare engines and related rotable parts 25 to 30 Aircraft seats 10 to 15 Buildings 25 to 45 Other property and equipment 3 to 15 Computer software 5 to 15 Building improvements 1 to 40 Operating property and equipment, net at December 31 was as follows (in millions): 2024 2023 Flight equipment $ 52,696 $ 48,448 Other property and equipment 11,908 10,527 Purchase deposits for flight equipment 3,427 3,550 Total operating property and equipment 68,031 62,525 Less—Accumulated depreciation and amortization (25,123) (22,710) Total operating property and equipment, net $ 42,908 $ 39,815
Information about Goodwill and Other Intangible Assets	The following table presents information about the Company's goodwill and other intangible assets at December 31 (in millions): 2024 2023 Gross Accumulated Gross Accumulated Goodwill $ 4,527 $ 4,527 Indefinite-lived intangible assets China route authority $ 1,020 $ 1,020 Airport slots 564 574 Tradenames and logos 593 593 Alliances 404 404 Total $ 2,581 $ 2,591 Finite-lived intangible assets Frequent flyer database $ 1,177 $ 1,092 $ 1,177 $ 1,068 Hubs 145 138 145 131 Other 143 133 307 296 Total $ 1,465 $ 1,363 $ 1,629 $ 1,495

REVENUE RECOGNITION (Tables)

REVENUE RECOGNITION (Tables)	12 Months Ended
	Dec. 31, 2024
Revenue from Contract with Customer [Abstract]
Schedule of Operating Revenue by Geographic Region	The Company further disaggregates its operating revenue by principal geographic region for the years ended December 31 is presented in the table below (in millions): 2024 2023 2022 Domestic (U.S. and Canada) $ 34,067 $ 32,400 $ 28,474 Atlantic 11,097 10,982 9,072 Pacific 6,462 5,267 2,927 Latin America 5,437 5,068 4,482 Total $ 57,063 $ 53,717 $ 44,955
Schedule of Roll Forward of Frequent Flyer Deferred Revenue	The table below presents a roll forward of Frequent flyer deferred revenue (in millions): 2024 2023 Balance at January 1 $ 7,143 $ 6,675 Miles earned 3,563 3,297 Travel miles redeemed (3,150) (2,723) Non-travel miles redeemed (115) (106) Balance at December 31 $ 7,441 $ 7,143

COMMON STOCKHOLDERS' EQUITY A_2

COMMON STOCKHOLDERS' EQUITY AND PREFERRED SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Summary of Warrants Outstanding	As of December 31, 2024, the Company had the below Warrants outstanding: Warrant Description Number of Shares of UAL Common Stock Exercise Price Expiration Dates PSP2 Warrants 2,011,924 $ 43.26 1/15/2026 — 4/29/2026 PSP3 Warrants 1,501,790 53.92 4/29/2026 — 6/10/2026 Total 3,513,714

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2024
Earnings Per Share [Abstract]
Computation of Earnings Per Share	The computations of UAL's basic and diluted earnings per share are set forth below for the years ended December 31 (in millions, except per share amounts): 2024 2023 2022 Earnings available to common stockholders $ 3,149 $ 2,618 $ 737 Basic weighted-average shares outstanding 328.6 327.8 326.4 Dilutive effect of stock Warrants (a) 1.7 2.2 1.5 Dilutive effect of employee stock awards 2.9 1.9 2.2 Diluted weighted-average shares outstanding 333.2 331.9 330.1 Earnings per share, basic $ 9.58 $ 7.98 $ 2.26 Earnings per share, diluted $ 9.45 $ 7.89 $ 2.23 Potentially dilutive securities (b) Stock Warrants (a) — 1.5 3.5 Employee stock awards 0.3 0.6 0.7 (a) See Note 3 of this report for additional information about these Warrants. (b) Weighted-average potentially dilutive securities outstanding excluded from the computation of diluted earnings per share because the securities would have had an antidilutive effect.

SHARE-BASED COMPENSATION PLANS

SHARE-BASED COMPENSATION PLANS (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Information Related to Share-Based Compensation Plan Cost	The following table provides information related to UAL's share-based compensation plan cost for the years ended December 31 (in millions): Compensation cost 2024 2023 2022 RSUs $ 141 $ 78 $ 87 Stock options 1 2 2 Total $ 142 $ 80 $ 89
Summary of Unearned Compensation and Weighted-Average Remaining Period to Recognize Costs	The table below summarizes UAL's unearned compensation and weighted-average remaining period to recognize costs for all outstanding share-based awards that are probable of being achieved as of December 31, 2024 (in millions, except as noted): Unearned Compensation Weighted-Average RSUs $ 110 1.5 Stock options 2 2.2 Total $ 112
Summary of RSU and Restricted Stock Activity	The table below summarizes UAL's RSU activity for the years ended December 31 (shares in millions): Liability Awards Equity Awards RSUs RSUs Weighted- Outstanding at December 31, 2021 0.2 4.4 $ 53.63 Granted 0.1 2.3 31.96 Additional issuance due to achievement of performance metrics — 1.6 58.17 Vested (0.2) (4.8) 56.00 Forfeited — (0.2) 53.03 Outstanding at December 31, 2022 0.1 3.3 37.88 Granted 0.1 2.5 43.42 Vested (0.1) (1.6) 44.03 Forfeited — (0.1) 36.90 Outstanding at December 31, 2023 0.1 4.1 38.86 Granted 0.1 3.6 46.65 Vested (0.1) (2.3) 39.37 Forfeited — (0.3) 43.28 Outstanding at December 31, 2024 0.1 5.1 43.89

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ("AOCI") (Tables)	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Components of Accumulated Other Comprehensive Income, Net of Tax	The table below presents the components of the Company's AOCI, net of tax (in millions): Pension and Investments and Other Deferred Taxes (a) Total Balance at December 31, 2021 $ (847) $ — $ (95) $ (942) Changes in value 1,474 (35) (321) 1,118 Amounts reclassified to earnings (1) (b) — — (1) Balance at December 31, 2022 626 (35) (416) 175 Changes in value (199) 31 38 (130) Amounts reclassified to earnings (138) (b) — 31 (107) Balance at December 31, 2023 289 (4) (347) (62) Changes in value 417 4 (94) 327 Amounts reclassified to earnings (99) (b) — 22 (77) Balance at December 31, 2024 $ 607 $ — $ (419) $ 188 (a) Includes approximately $285 million of deferred income tax expense that will not be recognized in net income until the related pension and postretirement benefit obligations are fully extinguished. We consider all income sources, including other comprehensive income, in determining the amount of tax benefit allocated to results from operations. (b) This AOCI component is included in the computation of net periodic pension and other postretirement costs, specifically the following components: amortization of unrecognized (gain) loss, amortization of prior service credit and other. See Note 8 of this report for additional information on pensions and other postretirement liabilities.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Tax Provision (Benefit) Differed from Amounts Computed at the Statutory Federal Income Tax Rate and Significant Components	The income tax provision differed from amounts computed at the statutory federal income tax rate and consisted of the following significant components (in millions) : 2024 2023 2022 Income tax provision at statutory rate $ 875 $ 711 $ 208 State income tax provision, net of federal income tax benefit 56 46 13 Nondeductible employee meals 16 15 12 Nondeductible transportation fringe benefit 16 13 10 Valuation allowance 29 (21) (10) Other, net 27 5 20 Income tax expense $ 1,019 $ 769 $ 253 Current $ 84 $ 13 $ 5 Deferred 935 756 248 Income tax expense $ 1,019 $ 769 $ 253
Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities	Temporary differences and carryforwards that give rise to deferred tax assets and liabilities at December 31, 2024 and 2023 were as follows (in millions): UAL United 2024 2023 2024 2023 Deferred income tax asset (liability): Federal and state net operating loss ("NOL") carryforwards $ 2,149 $ 2,644 $ 2,119 $ 2,616 Deferred revenue 1,865 1,845 1,865 1,845 Employee benefits, including pension, postretirement and medical 608 695 608 695 Operating lease liabilities 1,110 1,134 1,110 1,134 Other financial liabilities 517 414 517 414 Interest expense carryforward 467 579 467 579 Other 565 575 565 575 Less: Valuation allowance (208) (179) (208) (179) Total deferred tax assets $ 7,073 $ 7,707 $ 7,043 $ 7,679 Depreciation $ (7,171) $ (6,782) $ (7,171) $ (6,782) Operating lease right-of-use asset (863) (887) (863) (887) Intangibles (619) (632) (619) (632) Total deferred tax liabilities $ (8,653) $ (8,301) $ (8,653) $ (8,301) Net deferred tax asset (liability) $ (1,580) $ (594) $ (1,610) $ (622)

PENSION, POSTRETIREMENT AND O_2

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS (Tables)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Reconciliation of the Change in Benefit Obligation and Plan Assets and Funded Status	The following tables set forth the reconciliation of the beginning and ending balances of the benefit obligation and plan assets, the funded status and the amounts recognized in these financial statements for the defined benefit and other postretirement plans (in millions): Pension Benefits Year Ended December 31, 2024 Year Ended December 31, 2023 Accumulated benefit obligation: $ 3,752 $ 3,910 Change in projected benefit obligation: Projected benefit obligation at beginning of year $ 4,550 $ 4,181 Service cost 135 124 Interest cost 229 217 Actuarial (gain) loss (460) 204 Benefits paid (135) (177) Other (4) 1 Projected benefit obligation at end of year $ 4,315 $ 4,550 Change in plan assets: Fair value of plan assets at beginning of year $ 3,599 $ 3,467 Actual income on plan assets 132 281 Employer contributions 5 22 Benefits paid (135) (177) Other — 6 Fair value of plan assets at end of year $ 3,601 $ 3,599 Funded status—Net amount recognized $ (714) $ (951) Pension Benefits December 31, 2024 December 31, 2023 Amounts recognized in the consolidated balance sheets consist of: Noncurrent asset $ 22 $ 21 Current liability (7) (4) Noncurrent liability (729) (968) Total liability $ (714) $ (951) Amounts recognized in accumulated other comprehensive income (loss) consist of: Net actuarial gain (loss) $ 95 $ (242) Total accumulated other comprehensive gain (loss) $ 95 $ (242) Other Postretirement Benefits Year Ended December 31, 2024 Year Ended December 31, 2023 Change in benefit obligation: Benefit obligation at beginning of year $ 746 $ 788 Service cost 5 4 Interest cost 38 42 Plan participants' contributions 65 67 Benefits paid (163) (177) Actuarial (gain) loss (101) 22 Benefit obligation at end of year $ 590 $ 746 Change in plan assets: Fair value of plan assets at beginning of year $ 46 $ 48 Actual return on plan assets 1 1 Employer contributions 96 107 Plan participants' contributions 65 67 Benefits paid (163) (177) Fair value of plan assets at end of year 45 46 Funded status—Net amount recognized $ (545) $ (700)
Amounts Recognized in Consolidated Balance Sheet and Accumulated Other Comprehensive Income (Loss)	Other Postretirement Benefits December 31, 2024 December 31, 2023 Amounts recognized in the consolidated balance sheets consist of: Current liability $ (41) $ (63) Noncurrent liability (504) (637) Total liability $ (545) $ (700) Amounts recognized in accumulated other comprehensive income (loss) consist of: Net actuarial gain $ 383 $ 309 Prior service credit 129 222 Total accumulated other comprehensive income $ 512 $ 531
Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets	The following information relates to all pension plans with an accumulated benefit obligation and a projected benefit obligation in excess of plan assets at December 31 (in millions): 2024 2023 Projected benefit obligation $ 4,179 $ 4,407 Accumulated benefit obligation 3,617 3,767 Fair value of plan assets 3,443 3,435
Components Of Net Periodic Benefit Cost	Net periodic benefit cost (credit) for the years ended December 31 included the following components (in millions): 2024 2023 2022 Pension Benefits Other Postretirement Benefits Pension Benefits Other Postretirement Benefits Pension Benefits Other Postretirement Benefits Service cost $ 135 $ 5 $ 124 $ 4 $ 204 $ 9 Interest cost 229 38 217 42 188 30 Expected return on plan assets (276) (1) (251) (1) (306) (1) Amortization of unrecognized actuarial (gain) loss 19 (26) 8 (38) 120 (14) Amortization of prior service (credits) cost — (93) 1 (112) — (112) Other 1 — 3 — 5 — Net periodic benefit cost (credit) $ 108 $ (77) $ 102 $ (105) $ 211 $ (88) The Company's expected Net periodic benefit cost (credit) for 2025 is as follows (in millions): Pension Benefits Other Postretirement Benefits Net periodic benefit cost (credit) $ 91 $ (81)
Assumptions Used for Benefit Plans	The assumptions used for the benefit plans were as follows: Pension Benefits Assumptions used to determine benefit obligations 2024 2023 Discount rate 5.67 % 5.04 % Rate of compensation increase 3.85 % 3.84 % Assumptions used to determine net expense Discount rate 5.04 % 5.20 % Expected return on plan assets 7.97 % 7.53 % Rate of compensation increase 3.84 % 3.83 % Other Postretirement Benefits Assumptions used to determine benefit obligations 2024 2023 Discount rate 5.70 % 5.43 % Assumptions used to determine net expense Discount rate 5.43 % 5.66 % Expected return on plan assets 3.00 % 3.00 % Health care cost trend rate assumed for next year 6.75 % 7.00 % Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2033) 4.50 % 4.50 %
Allocation of Plan Assets	Plan fiduciaries regularly review our actual asset allocation and the pension plans' investments are periodically rebalanced to our targeted allocation when considered appropriate. United's plan assets are allocated within the following guidelines: Percent of Total Expected Long-Term Equity securities 27 - 55 % 9 % Fixed-income securities 33 - 61 7 Alternatives 7 - 25 7
Schedule of Change in Assumptions on Net Periodic Benefit Cost and Benefit Obligations	The table below shows the impacts of a change in certain assumptions on the 2025 net periodic benefit cost and the benefit obligations at December 31, 2024 (in millions): Pension Benefits Other Postretirement Benefits Impact on Benefit Obligation at December 31, 2024 100 basis points decrease in the weighted average discount rate $ 745 $ 38 Impact on 2025 Net Periodic Benefit Cost 100 basis points decrease in the weighted average discount rate (a) $ 83 $ — 100 basis points decrease in the expected long-term rate of return on plan assets 35 — (a) In general, as discount rates increase, the impact of changes in discount rates decreases. Therefore, these sensitivities cannot be extrapolated for larger increases or decreases in the discount rate. In addition, benefit cost is affected by other factors including, but not limited to, investment performance, contributions, demographic experience and other assumption changes.
Pension and Other Postretirement Plan Assets	The following tables present information about United's pension and other postretirement plan assets at December 31 (in millions): 2024 2023 Pension Plan Assets: Total Level 1 Level 2 Level 3 Assets Measured at NAV(a) Total Level 1 Level 2 Level 3 Assets Measured at NAV(a) Equity securities funds $ 1,231 $ 92 $ 4 $ 150 $ 985 $ 1,265 $ 74 $ 3 $ 134 $ 1,054 Fixed-income securities 1,359 — 100 1 1,258 1,325 — 411 3 911 Alternatives 762 — — 116 646 779 — — 136 643 Other investments 249 14 153 2 80 230 13 87 3 127 Total $ 3,601 $ 106 $ 257 $ 269 $ 2,969 $ 3,599 $ 87 $ 501 $ 276 $ 2,735 Other Postretirement Benefit Plan Assets: Deposit administration fund $ 45 $ — $ — $ 45 $ — $ 46 $ — $ — $ 46 $ — (a) In accordance with the relevant accounting standards, certain investments that are measured at fair value using the net asset value ("NAV") per share (or its equivalent) have not been classified in the fair value hierarchy. These investments are commingled funds that invest in equity securities and fixed-income instruments including bonds, debt securities, and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. Redemption periods for these investments range from daily to semiannually.
Defined Benefit Plan Assets Measured at Fair Value Using Unobservable Inputs	The following table presents reconciliation of United's benefit plan assets measured at fair value using unobservable inputs (Level 3) for the years ended December 31, 2024 and 2023 (in millions): 2024 2023 Balance at beginning of year $ 322 $ 333 Actual income (loss) on plan assets: Sold during the year 1 (50) Held at year end 6 55 Purchases, sales, issuances and settlements (net) (15) (16) Balance at end of year $ 314 $ 322
Estimated Future Benefit Payments	The estimated future benefit payments, net of expected participant contributions, in United's pension plans and other postretirement benefit plans for the next ten years, as of December 31, 2024, are as follows (in millions): Pension Other Postretirement 2025 $ 311 $ 88 2026 328 79 2027 348 70 2028 372 66 2029 371 62 Years 2030 – 2034 1,863 218
Participation in the IAM National Pension Plan	United's participation in the IAM National Pension Plan ("IAM Plan") for the annual period ended December 31, 2024 is outlined in the table below. The risks of participating in these multi-employer plans are different from single-employer plans, as United may be subject to additional risks that others do not meet their obligations, which in certain circumstances could revert to United, or if a withdrawal from a multi-employer plan occurs for United. The IAM Plan reported $570 million in employers' contributions for the year ended December 31, 2023. For 2023, the Company's contributions to the IAM Plan represented more than 5% of total contributions to the IAM Plan. The 2024 information is not available as the applicable Form 5500 is not final for the plan year. Pension Fund IAM National Pension Fund ("IAM Fund") EIN/ Pension Plan Number 51-6031295 — 002 Pension Protection Act Zone Status (2024 and 2023) Critical (2024 and 2023). A plan is in "critical" status if the funded percentage is less than 65 percent. On April 17, 2019, the IAM National Pension Fund Board of Trustees voluntarily elected for the IAM Fund to be in critical status effective for the plan year beginning January 1, 2019 to strengthen the IAM Fund's financial health. The IAM Fund's funded percentage was 86.5% as of January 1, 2023. FIP/RP Status Pending/Implemented A 10-year Rehabilitation Plan effective, January 1, 2022, was adopted on April 17, 2019 that requires the Company to make an additional contribution of 2.5% of the hourly contribution rate, compounded annually for the length of the Rehabilitation Plan, effective June 1, 2019. United's Contributions $95 million, $87 million and $75 million in the years ended December 31, 2024, 2023 and 2022, respectively. Surcharge Imposed No Expiration Date of Collective Bargaining Agreement N/A

FAIR VALUE MEASUREMENTS, INVE_2

FAIR VALUE MEASUREMENTS, INVESTMENTS AND NOTES RECEIVABLE (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	The table below presents the fair value of financial assets and liabilities measured at fair value, based on the inputs described in Note 1, on a recurring basis in the Company's financial statements as of December 31 (in millions): 2024 2023 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Cash and cash equivalents $ 8,769 $ 8,769 $ — $ — $ 6,058 $ 6,058 $ — $ — Restricted cash - current (Note 1) 11 11 — — 31 31 — — Restricted cash - non-current (Note 1) 166 166 — — 245 245 — — Short-term investments: U.S. government and agency notes 2,280 — 2,280 — 8,257 — 8,257 — Certificates of deposit placed through an account registry service ("CDARS") 59 — 59 — 73 — 73 — Corporate debt 3,127 — 3,127 — — — — — Other fixed-income securities 240 — 240 — — — — — Long-term investments: Equity securities 71 71 — — 177 177 — —
Carrying Values and Estimated Fair Values of Financial Instruments	The table below presents the carrying values and estimated fair values of financial instruments not presented in the tables above as of December 31 (in millions). Carrying amounts include any related discounts, premiums and issuance costs: 2024 2023 Carrying Amount Fair Value Carrying Amount Fair Value Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Long-term debt $ 24,653 $ 24,423 $ — $ 17,300 $ 7,123 $ 29,075 $ 28,302 $ — $ 22,543 $ 5,759
Description of Fair Value of Financial Instruments and Fair Value Methodology	Fair value of the financial instruments included in the tables above was determined as follows: Description Fair Value Methodology Cash and cash equivalents and The carrying amounts of these assets approximate fair value. Short-term and Long-term investments Fair value is based on (a) the trading prices of the investment or similar Long-term debt Fair values are based on either market prices or the discounted amount of future cash flows using our current incremental rate of borrowing for similar liabilities.

DEBT (Tables)

DEBT (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Summary of Long-Term Debt	(In millions) Maturity Dates Interest Rate(s) at December 31, 2024 At December 31, 2024 2023 Equipment Notes (a) 2025 — 2037 2.70 % — 6.51 % $ 12,983 $ 12,508 MileagePlus Senior Secured Notes 2027 6.50% 1,900 2,660 MileagePlus Term Loan Faci lity n/a n/a — 2,100 2026 and 2029 Notes 2026 — 2029 4.38 % — 4.63 % 4,000 4,000 2021 Term Loan s n/a n/a — 3,870 2024 Term Loans (b) 2031 6.63% 2,082 — Unsecured Notes 2025 4.88% 315 596 PSP Notes (c) 2030 — 2031 1.00% 3,181 3,181 Other unsecured debt 2027 — 2029 4.00 % — 5.75 % 376 437 24,837 29,352 Less: unamortized debt discount, premiums and debt issuance costs (184) (277) Less: current portion of long-term debt (2,973) (4,018) Long-term debt, net $ 21,680 $ 25,057 (a) Financing includes variable rate debt based on the Secured Overnight Financing Rate ("SOFR") (or another index rate), generally subject to a floor, plus a specified margin of 0.64% to 2.00%. (b) Financing includes variable rate debt based on SOFR (or another index rate), subject to a floor, plus a specified margin of 2.00%. (c) The PSP Notes include $1.50 billion of indebtedness evidenced by a 10-year senior unsecured promissory note with Treasury provided under PSP, $0.9 billion of indebtedness evidenced by a 10-year senior unsecured promissory note issued to Treasury pursuant to PSP2 and $0.8 billion of indebtedness evidenced by a 10-year senior unsecured promissory note issued to Treasury pursuant to PSP3. These PSP Notes have a rate of 1.00% in years 1 through 5, and a rate of the SOFR plus 2.00% in years 6 through 10.
Contractual Principal Payments under Outstanding Long-Term Debt Agreements	The table below presents the Company's contractual principal payments (not including debt discount or debt issuance costs) as of December 31, 2024 under then-outstanding long-term debt agreements (in millions): 2025 2026 2027 2028 2029 After 2029 Total Contractual principal payments $ 2,973 $ 4,793 $ 2,326 $ 1,791 $ 2,892 $ 10,062 $ 24,837

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Components of Lease Cost	The Company's lease cost for the years ended December 31 included the following components (in millions): 2024 2023 2022 Operating lease cost $ 855 $ 925 $ 941 Variable and short-term lease cost 3,592 3,028 2,603 Amortization of finance lease assets 62 52 72 Interest on finance lease liabilities 16 20 13 Sublease income (35) (39) (33) Total lease cost $ 4,490 $ 3,986 $ 3,596
Summary of Scheduled Future Minimum Lease Payments under Operating Leases	The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases, recorded on the balance sheet, as of December 31, 2024 (in millions): Operating Leases Finance Leases 2025 $ 757 $ 232 2026 731 33 2027 926 21 2028 742 11 2029 546 5 After 2029 3,081 4 Minimum lease payments 6,783 306 Imputed interest (1,806) (15) Present value of minimum lease payments 4,977 291 Less: current maturities of lease obligations (467) (223) Long-term lease obligations $ 4,510 $ 68
Summary of Scheduled Future Minimum Lease Payments Under Finance Leases	The table below summarizes the Company's scheduled future minimum lease payments under operating and finance leases, recorded on the balance sheet, as of December 31, 2024 (in millions): Operating Leases Finance Leases 2025 $ 757 $ 232 2026 731 33 2027 926 21 2028 742 11 2029 546 5 After 2029 3,081 4 Minimum lease payments 6,783 306 Imputed interest (1,806) (15) Present value of minimum lease payments 4,977 291 Less: current maturities of lease obligations (467) (223) Long-term lease obligations $ 4,510 $ 68
Contractual Obligation, Fiscal Year Maturity	The table below presents the Company's future contractual lease payments at December 31, 2024 under then-outstanding sale and leaseback agreements that did not qualify as a sale under the applicable accounting guidance (in millions): Other Financial Liabilities 2025 $ 453 2026 320 2027 610 2028 283 2029 280 After 2029 3,232 5,178 Imputed interest (1,466) Current maturities of other financial liabilities (257) Other financial liabilities $ 3,455 2025 2026 2027 2028 2029 After 2029 Total Future commitments under CPAs $ 2.7 $ 2.8 $ 2.1 $ 1.8 $ 1.4 $ 4.1 $ 14.9
Additional Information Related to Leases	The table below presents additional information related to our leases as of December 31: 2024 2023 Weighted-average remaining lease term - operating leases 11 years 10 years Weighted-average remaining lease term - finance leases 2 years 2 years Weighted-average remaining lease term - other financial liabilities 10 years 10 years Weighted-average discount rate - operating leases 5.9 % 5.8 % Weighted-average discount rate - finance leases 5.9 % 6.3 % Weighted-average interest rate - other financial liabilities 5.3 % 5.3 %
Supplemental Cash Flow Information Related to Leases	The table below presents supplemental cash flow information related to leases during the year ended December 31 (in millions): 2024 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases $ 851 $ 874 $ 919 Operating cash flows for finance leases 15 21 13 Financing cash flows for finance leases 269 311 124

COMMITMENTS, CONTINGENCIES AN_2

COMMITMENTS, CONTINGENCIES AND GUARANTEES (Tables)	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Summary of Purchase Commitments	The table below summarizes United's firm commitments as of December 31, 2024, which include aircraft and related spare engines, aircraft improvements and non-aircraft capital commitments (in billions): 2025 2026 2027 2028 2029 After 2029 Total Purchase commitments $ 9.6 $ 6.0 $ 4.7 $ 6.5 $ 8.1 $ 19.5 $ 54.4
Schedule of Estimated Future Payments of Contractual Obligation	The table below presents the Company's future contractual lease payments at December 31, 2024 under then-outstanding sale and leaseback agreements that did not qualify as a sale under the applicable accounting guidance (in millions): Other Financial Liabilities 2025 $ 453 2026 320 2027 610 2028 283 2029 280 After 2029 3,232 5,178 Imputed interest (1,466) Current maturities of other financial liabilities (257) Other financial liabilities $ 3,455 2025 2026 2027 2028 2029 After 2029 Total Future commitments under CPAs $ 2.7 $ 2.8 $ 2.1 $ 1.8 $ 1.4 $ 4.1 $ 14.9

SPECIAL CHARGES (Tables)

SPECIAL CHARGES (Tables)	12 Months Ended
	Dec. 31, 2024
Restructuring and Related Activities [Abstract]
Components of Special Charges	For the years ended December 31, operating and nonoperating special charges and unrealized (gains) losses on investments in the statements of consolidated operations consisted of the following (in millions): 2024 2023 2022 (Gains) losses on sale of assets and other special charges $ 112 $ 135 $ 140 Labor contract ratification bonuses — 814 — Total operating special charges 112 949 140 Nonoperating unrealized (gains) losses on investments, net 199 (27) (20) Nonoperating debt extinguishment and modification fees 128 11 7 Total nonoperating special charges and unrealized (gains) losses on investments, net 327 (16) (13) Total operating and nonoperating special charges and unrealized (gains) losses on investments, net 439 933 127 Income tax benefit, net of valuation allowance (54) (214) (33) Total operating and nonoperating special charges and unrealized (gains) losses on investments, net of income taxes $ 385 $ 719 $ 94

BASIS OF PRESENTATION AND SIG_4

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | segment	1
Allowance for obsolescence	$ 739	$ 689
Obsolescence expense	175	102	$ 73
Carrying value of computer software	456	453
Amortization expense	32	37	41
Projected amortization expense in 2025	28
Projected amortization expense in 2026	18
Projected amortization expense in 2027	11
Projected amortization expense in 2028	10
Projected amortization expense in 2029	8
Advertising expense	235	221	165
Computer software
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense	$ 155	$ 168	$ 166

BASIS OF PRESENTATION AND SIG_5

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 8,769	$ 6,058	$ 7,166
Restricted cash in Prepaid expenses and other	11	31	45
Noncurrent assets:
Restricted cash in Investments in affiliates and other, net	166	245	210
Total cash, cash equivalents and restricted cash	$ 8,946	$ 6,334	$ 7,421	$ 18,533

BASIS OF PRESENTATION AND SIG_6

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Operating Property and Equipment, net (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Flight equipment	$ 52,696	$ 48,448
Other property and equipment	11,908	10,527
Purchase deposits for flight equipment	3,427	3,550
Total operating property and equipment	68,031	62,525
Less—Accumulated depreciation and amortization	(25,123)	(22,710)
Total operating property and equipment, net	$ 42,908	$ 39,815
Aircraft, spare engines and related rotable parts | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years
Aircraft, spare engines and related rotable parts | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	30 years
Aircraft seats | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Aircraft seats | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	25 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	45 years
Other property and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Other property and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	5 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Building improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life	1 year
Building improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years

BASIS OF PRESENTATION AND SIG_7

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Information about Goodwill and Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 4,527	$ 4,527
Indefinite-lived intangible assets
Gross  Carrying Amount	2,581	2,591
Finite-lived intangible assets
Gross  Carrying Amount	1,465	1,629
Accumulated Amortization	1,363	1,495
Frequent flyer database
Finite-lived intangible assets
Gross  Carrying Amount	1,177	1,177
Accumulated Amortization	1,092	1,068
Hubs
Finite-lived intangible assets
Gross  Carrying Amount	145	145
Accumulated Amortization	138	131
Other
Finite-lived intangible assets
Gross  Carrying Amount	143	307
Accumulated Amortization	133	296
China route authority
Indefinite-lived intangible assets
Gross  Carrying Amount	1,020	1,020
Airport slots
Indefinite-lived intangible assets
Gross  Carrying Amount	564	574
Tradenames and logos
Indefinite-lived intangible assets
Gross  Carrying Amount	593	593
Alliances
Indefinite-lived intangible assets
Gross  Carrying Amount	$ 404	$ 404

REVENUE RECOGNITION - Narrative

REVENUE RECOGNITION - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue From Contract With Customer [Line Items]
Expiration period for refundable tickets	1 year
Expiration period for advance ticket sales	12 months
Revenue	$ 57,063	$ 53,717	$ 44,955
Period over which miles are expected to be redeemed	two years
Minimum
Revenue From Contract With Customer [Line Items]
Term for frequent flyer mileage sales to partners	1 year
Maximum
Revenue From Contract With Customer [Line Items]
Term for frequent flyer mileage sales to partners	5 years
Advance Ticket Sales
Revenue From Contract With Customer [Line Items]
Revenue recognized	$ 5,300	5,700	3,300
Ancillary Fees Recorded within Passenger Revenues
Revenue From Contract With Customer [Line Items]
Revenue	4,500	4,100	3,400
Other operating revenue
Revenue From Contract With Customer [Line Items]
Revenue	3,491	3,176	2,752
Other operating revenue | Chase and Other Partner Agreements
Revenue From Contract With Customer [Line Items]
Revenue	$ 2,900	$ 2,700	$ 2,400

REVENUE RECOGNITION - Schedule

REVENUE RECOGNITION - Schedule of Operating Revenue by Geographic Region (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 57,063	$ 53,717	$ 44,955
Domestic (U.S. and Canada)
Disaggregation of Revenue [Line Items]
Total operating revenue	34,067	32,400	28,474
Atlantic
Disaggregation of Revenue [Line Items]
Total operating revenue	11,097	10,982	9,072
Pacific
Disaggregation of Revenue [Line Items]
Total operating revenue	6,462	5,267	2,927
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 5,437	$ 5,068	$ 4,482

REVENUE RECOGNITION - Roll Forw

REVENUE RECOGNITION - Roll Forward of Frequent Flyer Deferred Revenue (Details) - Frequent Flyer - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Movement in Deferred Revenue [Roll Forward]
Balance at January 1	$ 7,143	$ 6,675
Miles earned	3,563	3,297
Travel miles redeemed	(3,150)	(2,723)
Non-travel miles redeemed	(115)	(106)
Balance at December 31	$ 7,441	$ 7,143

COMMON STOCKHOLDERS' EQUITY A_3

COMMON STOCKHOLDERS' EQUITY AND PREFERRED SECURITIES - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2024	Dec. 31, 2024	Dec. 31, 2024	Feb. 24, 2025	Oct. 15, 2024	Dec. 31, 2021	Dec. 31, 2020
Class of Warrant or Right [Line Items]
Aggregate value of outstanding shares authorized for purchase under share repurchase program					$ 1,500
Value of authorized shares yet to be purchased under share repurchase program					$ 500
Number of shares repurchased (in shares)	2,043,906	997,076
Average price per share of shares repurchased (in dollars per share)		$ 81.26
Value of shares repurchased	$ 82	$ 81	$ 162
Common stock reserved for future issuance (in shares)		3,500,000	3,500,000
Junior preferred stock outstanding (in shares)		2	2
Junior preferred stock par value per share (in dollars per share)		$ 0.01	$ 0.01
Preferred stock authorized to issue (in shares)		250,000,000	250,000,000
Exercise price of warrants (in dollars per share)	$ 31.50
Number of shares issued in settlement of warrants exercised (in shares)	2,043,906
Subsequent Event
Class of Warrant or Right [Line Items]
Value of authorized shares yet to be purchased under share repurchase program				$ 1,300
Common Stock
Class of Warrant or Right [Line Items]
Number of shares purchased as a result of warrants exercised (in shares)	6,414,635					9,928,349	9,928,349
Percentage of total warrants exercised	65%

COMMON STOCKHOLDERS' EQUITY A_4

COMMON STOCKHOLDERS' EQUITY AND PREFERRED SECURITIES - Summary of Warrants Outstanding (Details) - $ / shares shares in Millions	Dec. 31, 2024	Aug. 31, 2024
Class of Warrant or Right [Line Items]
Number of Shares of UAL Common Stock (in shares)	3,513,714
Exercise Price (in dollars per share)		$ 31.50
PSP2 Warrants
Class of Warrant or Right [Line Items]
Number of Shares of UAL Common Stock (in shares)	2,011,924
Exercise Price (in dollars per share)	$ 43.26
PSP3 Warrants
Class of Warrant or Right [Line Items]
Number of Shares of UAL Common Stock (in shares)	1,501,790
Exercise Price (in dollars per share)	$ 53.92

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Earnings available to common stockholders	$ 3,149	$ 2,618	$ 737
Basic weighted-average shares outstanding (in shares)	328.6	327.8	326.4
Dilutive effect of stock Warrants (in shares)	1.7	2.2	1.5
Dilutive effect of employee stock awards (in shares)	2.9	1.9	2.2
Diluted weighted-average shares outstanding (in shares)	333.2	331.9	330.1
Earnings per share, basic (in dollars per share)	$ 9.58	$ 7.98	$ 2.26
Earnings per share, diluted (in dollars per share)	$ 9.45	$ 7.89	$ 2.23
Stock Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	0	1.5	3.5
Employee stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (in shares)	0.3	0.6	0.7

SHARE-BASED COMPENSATION PLAN_2

SHARE-BASED COMPENSATION PLANS - Narrative (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of RSUs and restricted stock vested in period	$ 91	$ 76	$ 274
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	3.7
Number of days used to compute performance period average closing price of restricted stock units	20 days
Liabilities related to share based payments	$ 8
Payment related to share-based liabilities	$ 2	$ 3	$ 7
Time-Vested RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	2
Award vesting period	3 years
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)	1.7
Award vesting period	3 years
Continuous employment period	3 years
Award vesting percentage	33.33%
Performance-Based RSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award payout percentage	0%
Performance-Based RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award payout percentage	300%

SHARE-BASED COMPENSATION PLAN_3

SHARE-BASED COMPENSATION PLANS - Information Related to Share-Based Compensation Plan Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 142	$ 80	$ 89
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	141	78	87
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 1	$ 2	$ 2

SHARE-BASED COMPENSATION PLAN_4

SHARE-BASED COMPENSATION PLANS - Summary of Unearned Compensation and Weighted-Average Remaining Period to Recognize Costs (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 112
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 110
Weighted-Average Remaining Period (in years)	1 year 6 months
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unearned Compensation	$ 2
Weighted-Average Remaining Period (in years)	2 years 2 months 12 days

SHARE-BASED COMPENSATION PLAN_5

SHARE-BASED COMPENSATION PLANS - Summary of RSU and Restricted Stock Activity (Details) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability Awards - RSUs
Awards
Outstanding (in shares)	0.1	0.1	0.2
Granted (in shares)	0.1	0.1	0.1
Additional issuance due to achievement of performance metrics			0
Vested (in shares)	(0.1)	(0.1)	(0.2)
Forfeited (in shares)	0	0	0
Outstanding (in shares)	0.1	0.1	0.1
Equity Awards - RSUs
Awards
Outstanding (in shares)	4.1	3.3	4.4
Granted (in shares)	3.6	2.5	2.3
Additional issuance due to achievement of performance metrics			1.6
Vested (in shares)	(2.3)	(1.6)	(4.8)
Forfeited (in shares)	(0.3)	(0.1)	(0.2)
Outstanding (in shares)	5.1	4.1	3.3
Weighted- Average Grant Price
Outstanding (in dollars per share)	$ 38.86	$ 37.88	$ 53.63
Granted (in dollars per share)	46.65	43.42	31.96
Additional issuance due to achievement of performance metrics (in dollars per share)			58.17
Vested (in dollars per share)	39.37	44.03	56
Forfeited (in dollars per share)	43.28	36.90	53.03
Outstanding (in dollars per share)	$ 43.89	$ 38.86	$ 37.88

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ("AOCI") (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, deferred taxes	$ (347)	$ (416)	$ (95)
Balance	9,324	6,896	5,029
Changes in value, deferred tax	(94)	38	(321)
Changes in value	327	(130)	1,118
Amounts reclassified to earnings, deferred taxes	22	31	0
Amounts reclassified to earnings	(77)	(107)	(1)
Balance, deferred taxes	(419)	(347)	(416)
Balance	12,675	9,324	6,896
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(62)	175	(942)
Balance	188	(62)	175
Deferred income taxes	285
Pension and Other Postretirement Liabilities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, before tax	289	626	(847)
Changes in value, before tax	417	(199)	1,474
Amounts reclassified to earnings, before tax	(99)	(138)	(1)
Balance, before tax	607	289	626
Investments and Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, before tax	(4)	(35)	0
Changes in value, before tax	4	31	(35)
Amounts reclassified to earnings, before tax	0	0	0
Balance, before tax	$ 0	$ (4)	$ (35)

INCOME TAXES - Income Tax Provi

INCOME TAXES - Income Tax Provision (Benefit) Differed from Amounts Computed at the Statutory Federal Income Tax Rate and Significant Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income tax provision at statutory rate	$ 875	$ 711	$ 208
State income tax provision, net of federal income tax benefit	56	46	13
Nondeductible employee meals	16	15	12
Nondeductible transportation fringe benefit	16	13	10
Valuation allowance	29	(21)	(10)
Other, net	27	5	20
Income tax expense	1,019	769	253
Current	84	13	5
Deferred	$ 935	$ 756	$ 248

INCOME TAXES - Temporary Differ

INCOME TAXES - Temporary Differences and Carryforwards Giving Rise to Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Deferred income tax asset (liability):
Federal and state net operating loss ("NOL") carryforwards	$ 2,149	$ 2,644
Deferred revenue	1,865	1,845
Employee benefits, including pension, postretirement and medical	608	695
Operating lease liabilities	1,110	1,134
Other financial liabilities	517	414
Interest expense carryforward	467	579
Other	565	575
Less: Valuation allowance	(208)	(179)
Total deferred tax assets	7,073	7,707
Depreciation	(7,171)	(6,782)
Operating lease right-of-use asset	(863)	(887)
Intangibles	(619)	(632)
Total deferred tax liabilities	(8,653)	(8,301)
Net deferred tax liability	(1,580)	(594)
United Airlines, Inc.
Deferred income tax asset (liability):
Federal and state net operating loss ("NOL") carryforwards	2,119	2,616
Deferred revenue	1,865	1,845
Employee benefits, including pension, postretirement and medical	608	695
Operating lease liabilities	1,110	1,134
Other financial liabilities	517	414
Interest expense carryforward	467	579
Other	565	575
Less: Valuation allowance	(208)	(179)
Total deferred tax assets	7,043	7,679
Depreciation	(7,171)	(6,782)
Operating lease right-of-use asset	(863)	(887)
Intangibles	(619)	(632)
Total deferred tax liabilities	(8,653)	(8,301)
Net deferred tax liability	$ (1,610)	$ (622)

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Capital loss carryforwards, valuation allowance	$ 179
Unrecognized tax benefits	70	$ 66	$ 58
Federal | United Airlines, Inc.
Income Taxes [Line Items]
NOL carryforwards	9,700
Tax effected amount of NOLs	2,000
NOLs without an expiration date	9,600
Federal | United Airlines, Inc. | 2029
Income Taxes [Line Items]
NOL carryforwards	100
State
Income Taxes [Line Items]
Tax credits	58
NOL and tax credit carryforwards, valuation allowance	$ 29
State | Minimum
Income Taxes [Line Items]
Tax credit expiration period	1 year
State | Maximum
Income Taxes [Line Items]
Tax credit expiration period	15 years
State | United Airlines, Inc.
Income Taxes [Line Items]
NOL carryforwards	$ 3,000
Tax effected amount of NOLs	$ 200
State | United Airlines, Inc. | Minimum
Income Taxes [Line Items]
NOL expiration period	1 year
State | United Airlines, Inc. | Maximum
Income Taxes [Line Items]
NOL expiration period	20 years

PENSION, POSTRETIREMENT AND O_3

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) plan	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Number of defined benefit pension plans | plan	2
Profit sharing and payroll tax expense	$ 713	$ 681	$ 133
United Airlines, Inc.
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Expense for defined contribution plans	$ 1,200	$ 960	$ 756
United Airlines, Inc. | Minimum
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Employer contribution percentage	1%
United Airlines, Inc. | Maximum
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Employer contribution percentage	17%
Pension Benefits
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Anticipated contributions	$ 141
Other Postretirement Benefits
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
Anticipated contributions	$ 80

PENSION, POSTRETIREMENT AND O_4

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Reconciliation of the Change in Benefit Obligation and Plan Asset, Funded Status and Amounts Recognized in the Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 3,752	$ 3,910
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	4,550	4,181
Service cost	135	124	$ 204
Interest cost	229	217	188
Actuarial (gain) loss	(460)	204
Benefits paid	(135)	(177)
Other	(4)	1
Projected benefit obligation at end of year	4,315	4,550	4,181
Change in plan assets:
Fair value of plan assets at beginning of year	3,599	3,467
Actual income on plan assets	132	281
Employer contributions	5	22
Benefits paid	(135)	(177)
Other	0	6
Fair value of plan assets at end of year	3,601	3,599	3,467
Funded status—Net amount recognized	(714)	(951)
Amounts recognized in the consolidated balance sheets consist of:
Noncurrent asset	22	21
Current liability	(7)	(4)
Noncurrent liability	(729)	(968)
Total liability	(714)	(951)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	95	(242)
Total accumulated other comprehensive gain (loss)	95	(242)
Other Postretirement Benefits
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	746	788
Service cost	5	4	9
Interest cost	38	42	30
Plan participants' contributions	65	67
Actuarial (gain) loss	(101)	22
Benefits paid	(163)	(177)
Projected benefit obligation at end of year	590	746	788
Change in plan assets:
Fair value of plan assets at beginning of year	46	48
Actual income on plan assets	1	1
Employer contributions	96	107
Plan participants' contributions	65	67
Benefits paid	(163)	(177)
Fair value of plan assets at end of year	45	46	$ 48
Funded status—Net amount recognized	(545)	(700)
Amounts recognized in the consolidated balance sheets consist of:
Current liability	(41)	(63)
Noncurrent liability	(504)	(637)
Total liability	(545)	(700)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actuarial gain (loss)	383	309
Prior service cost	129	222
Total accumulated other comprehensive gain (loss)	$ 512	$ 531

PENSION, POSTRETIREMENT AND O_5

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Accumulated Benefit Obligation and Projected Benefit Obligation in Excess of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 4,179	$ 4,407
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	3,617	3,767
Fair value of plan assets	$ 3,443	$ 3,435

PENSION, POSTRETIREMENT AND O_6

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		$ 135	$ 124	$ 204
Interest cost		229	217	188
Expected return on plan assets		(276)	(251)	(306)
Amortization of unrecognized actuarial (gain) loss		19	8	120
Amortization of prior service (credits) cost		0	1	0
Other		1	3	5
Net periodic benefit cost (credit)		108	102	211
Pension Benefits | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)	$ 91
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		5	4	9
Interest cost		38	42	30
Expected return on plan assets		(1)	(1)	(1)
Amortization of unrecognized actuarial (gain) loss		(26)	(38)	(14)
Amortization of prior service (credits) cost		(93)	(112)	(112)
Other		0	0	0
Net periodic benefit cost (credit)		$ (77)	$ (105)	$ (88)
Other Postretirement Benefits | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (credit)	$ (81)

PENSION, POSTRETIREMENT AND O_7

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Assumptions Used for Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Pension Benefits
Assumptions used to determine benefit obligations
Discount rate	5.67%	5.04%
Rate of compensation increase	3.85%	3.84%
Assumptions used to determine net expense
Discount rate	5.04%	5.20%
Expected return on plan assets	7.97%	7.53%
Rate of compensation increase	3.84%	3.83%
Other Postretirement Benefits
Assumptions used to determine benefit obligations
Discount rate	5.70%	5.43%
Assumptions used to determine net expense
Discount rate	5.43%	5.66%
Expected return on plan assets	3%	3%
Health care cost trend rate assumed for next year	6.75%	7%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate in 2033)	4.50%	4.50%

PENSION, POSTRETIREMENT AND O_8

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Allocation of Plan Assets (Details) - Pension Benefits	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return	7.97%	7.53%
United Airlines, Inc. | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return	9%
United Airlines, Inc. | Equity securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	27%
United Airlines, Inc. | Equity securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	55%
United Airlines, Inc. | Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return	7%
United Airlines, Inc. | Fixed-income securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	33%
United Airlines, Inc. | Fixed-income securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	61%
United Airlines, Inc. | Alternatives
Defined Benefit Plan Disclosure [Line Items]
Expected Long-Term Rate of Return	7%
United Airlines, Inc. | Alternatives | Minimum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	7%
United Airlines, Inc. | Alternatives | Maximum
Defined Benefit Plan Disclosure [Line Items]
Percent of Total	25%

PENSION, POSTRETIREMENT AND O_9

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Change in Assumption of Benefit Obligation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Pension Benefits
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
100 basis points decrease in the weighted average discount rate	$ 745
100 basis points decrease in the weighted average discount rate	83
100 basis points decrease in the expected long-term rate of return on plan assets	35
Other Postretirement Benefits
Schedule Of Defined Benefit Plans And Defined Contribution Plans Disclosures [Line Items]
100 basis points decrease in the weighted average discount rate	38
100 basis points decrease in the weighted average discount rate	0
100 basis points decrease in the expected long-term rate of return on plan assets	$ 0

PENSION, POSTRETIREMENT AND _10

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Pension and Other Postretirement Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	$ 314	$ 322	$ 333
Pension Benefits
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	3,601	3,599	3,467
Pension Benefits | Level 1
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	106	87
Pension Benefits | Level 2
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	257	501
Pension Benefits | Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	269	276
Pension Benefits | Assets Measured at NAV
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	2,969	2,735
Pension Benefits | Equity securities funds
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	1,231	1,265
Pension Benefits | Equity securities funds | Level 1
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	92	74
Pension Benefits | Equity securities funds | Level 2
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	4	3
Pension Benefits | Equity securities funds | Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	150	134
Pension Benefits | Equity securities funds | Assets Measured at NAV
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	985	1,054
Pension Benefits | Fixed-income securities
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	1,359	1,325
Pension Benefits | Fixed-income securities | Level 1
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Fixed-income securities | Level 2
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	100	411
Pension Benefits | Fixed-income securities | Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	1	3
Pension Benefits | Fixed-income securities | Assets Measured at NAV
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	1,258	911
Pension Benefits | Alternatives
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	762	779
Pension Benefits | Alternatives | Level 1
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Alternatives | Level 2
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	0	0
Pension Benefits | Alternatives | Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	116	136
Pension Benefits | Alternatives | Assets Measured at NAV
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	646	643
Pension Benefits | Other investments
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	249	230
Pension Benefits | Other investments | Level 1
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	14	13
Pension Benefits | Other investments | Level 2
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	153	87
Pension Benefits | Other investments | Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	2	3
Pension Benefits | Other investments | Assets Measured at NAV
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	80	127
Other Postretirement Benefits
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	45	46	$ 48
Other Postretirement Benefits | Deposit administration fund
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	45	46
Other Postretirement Benefits | Deposit administration fund | Level 1
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	0	0
Other Postretirement Benefits | Deposit administration fund | Level 2
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	0	0
Other Postretirement Benefits | Deposit administration fund | Level 3
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	45	46
Other Postretirement Benefits | Deposit administration fund | Assets Measured at NAV
Defined Benefit Plan, Plan Assets, Category [Line Items]
Fair value of plan assets	$ 0	$ 0

PENSION, POSTRETIREMENT AND _11

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Defined Benefit Plan Assets Measured at Fair Value Using Unobservable Inputs (Details) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]
Fair value of plan assets at beginning of year	$ 322	$ 333
Actual income (loss) on plan assets:
Sold during the year	1	(50)
Held at year end	6	55
Purchases, sales, issuances and settlements (net)	(15)	(16)
Fair value of plan assets at end of year	$ 314	$ 322

PENSION, POSTRETIREMENT AND _12

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Estimated Future Benefit Payments (Details) $ in Millions	Dec. 31, 2024 USD ($)
Pension
Pension and Other Postretirement
2025	$ 311
2026	328
2027	348
2028	372
2029	371
Years 2030 – 2034	1,863
Other Postretirement
Pension and Other Postretirement
2025	88
2026	79
2027	70
2028	66
2029	62
Years 2030 – 2034	$ 218

PENSION, POSTRETIREMENT AND _13

PENSION, POSTRETIREMENT AND OTHER EMPLOYEE BENEFIT PLANS - Participation in the IAM National Pension Plan (Details) - IAM National Pension Plan - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2023
Multiemployer Plans [Line Items]
Multi-employer plan contributions			$ 570
Pension Benefits
Multiemployer Plans [Line Items]
Plan length	10 years
Additional contribution as a percentage of the hourly contribution rate	2.50%
Surcharge imposed		No
Pension Benefits | United Airlines, Inc.
Multiemployer Plans [Line Items]
Funded percentage					86.50%
Contributions		$ 95	$ 87	$ 75

FAIR VALUE MEASUREMENTS, INVE_3

FAIR VALUE MEASUREMENTS, INVESTMENTS AND NOTES RECEIVABLE - Fair Value of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Measured on a Recurring Basis - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 8,769	$ 6,058
Restricted cash - current	11	31
Restricted cash - non-current	166	245
Equity securities	71	177
U.S. government and agency notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	2,280	8,257
Certificates of deposit placed through an account registry service ("CDARS")
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	59	73
Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	3,127	0
Other fixed-income securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	240	0
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	8,769	6,058
Restricted cash - current	11	31
Restricted cash - non-current	166	245
Equity securities	71	177
Level 1 | U.S. government and agency notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Level 1 | Certificates of deposit placed through an account registry service ("CDARS")
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Level 1 | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Level 1 | Other fixed-income securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash - current	0	0
Restricted cash - non-current	0	0
Equity securities	0	0
Level 2 | U.S. government and agency notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	2,280	8,257
Level 2 | Certificates of deposit placed through an account registry service ("CDARS")
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	59	73
Level 2 | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	3,127	0
Level 2 | Other fixed-income securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	240	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Restricted cash - current	0	0
Restricted cash - non-current	0	0
Equity securities	0	0
Level 3 | U.S. government and agency notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Level 3 | Certificates of deposit placed through an account registry service ("CDARS")
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Level 3 | Corporate debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	0	0
Level 3 | Other fixed-income securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments	$ 0	$ 0

FAIR VALUE MEASUREMENTS, INVE_4

FAIR VALUE MEASUREMENTS, INVESTMENTS AND NOTES RECEIVABLE - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) aircraft
Fair Value [Line Items]
Investments in securities accounted for under the equity method	$ 241
Carrying amount of loan receivable	$ 72
Champlain
Fair Value [Line Items]
Number of regional aircraft | aircraft	57
Republic
Fair Value [Line Items]
Number of regional aircraft | aircraft	66
Republic
Fair Value [Line Items]
Ownership stake	19%
Champlain
Fair Value [Line Items]
Ownership stake	40%
UAV Fund
Fair Value [Line Items]
Ownership stake	33%
Other Investments
Fair Value [Line Items]
Carrying value of other investment	$ 264
Mesa
Fair Value [Line Items]
Variable interest	10%
Corporate Debt
Fair Value [Line Items]
Available for sale investment maturity term (less than)	2 years

FAIR VALUE MEASUREMENTS, INVE_5

FAIR VALUE MEASUREMENTS, INVESTMENTS AND NOTES RECEIVABLE - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying amount	$ 24,653	$ 29,075
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	24,423	28,302
Fair Value | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Fair Value | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	17,300	22,543
Fair Value | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$ 7,123	$ 5,759

DEBT - Summary of Long-Term Deb

DEBT - Summary of Long-Term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long term debt	$ 24,837,000,000	$ 29,352,000,000
Less: unamortized debt discount, premiums and debt issuance costs	(184,000,000)	(277,000,000)
Less: current portion of long-term debt	(2,973,000,000)	(4,018,000,000)
Long-term debt, net	21,680,000,000	25,057,000,000
Secured Debt | Equipment Notes
Debt Instrument [Line Items]
Long term debt	$ 12,983,000,000	12,508,000,000
Secured Debt | Equipment Notes | Minimum
Debt Instrument [Line Items]
Fixed interest rate	2.70%
Basis spread on variable rate	0.64%
Secured Debt | Equipment Notes | Maximum
Debt Instrument [Line Items]
Fixed interest rate	6.51%
Basis spread on variable rate	2%
Secured Debt | MileagePlus Senior Secured Notes
Debt Instrument [Line Items]
Fixed interest rate	6.50%
Long term debt	$ 1,900,000,000	2,660,000,000
Secured Debt | MileagePlus Term Loan Facility
Debt Instrument [Line Items]
Long term debt	0	2,100,000,000
Secured Debt | 2026 and 2029 Notes
Debt Instrument [Line Items]
Long term debt	$ 4,000,000,000	4,000,000,000
Secured Debt | 2026 and 2029 Notes | Minimum
Debt Instrument [Line Items]
Fixed interest rate	4.38%
Secured Debt | 2026 and 2029 Notes | Maximum
Debt Instrument [Line Items]
Fixed interest rate	4.63%
Secured Debt | 2021 Term Loans
Debt Instrument [Line Items]
Long term debt	$ 0	3,870,000,000
Basis spread on variable rate	2%
Secured Debt | 2024 Term Loans
Debt Instrument [Line Items]
Fixed interest rate	6.63%
Long term debt	$ 2,082,000,000	0
Unsecured | Notes
Debt Instrument [Line Items]
Fixed interest rate	4.88%
Long term debt	$ 315,000,000	596,000,000
Unsecured | PSP Notes
Debt Instrument [Line Items]
Fixed interest rate	1%
Long term debt	$ 3,181,000,000	3,181,000,000
Basis spread on variable rate	2%
Unsecured | PSP1 Note
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 1,500,000,000
Term of debt	10 years
Unsecured | PSP2 Note
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 900,000,000
Term of debt	10 years
Unsecured | PSP3 Note
Debt Instrument [Line Items]
Aggregate principal amount of debt	$ 800,000,000
Term of debt	10 years
Unsecured | Other unsecured debt
Debt Instrument [Line Items]
Long term debt	$ 376,000,000	$ 437,000,000
Unsecured | Other unsecured debt | Minimum
Debt Instrument [Line Items]
Fixed interest rate	4%
Unsecured | Other unsecured debt | Maximum
Debt Instrument [Line Items]
Fixed interest rate	5.75%

DEBT - Contractual Principal Pa

DEBT - Contractual Principal Payments under Outstanding Long-Term Debt Agreements (Details) - UAL and United $ in Millions	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
2025	$ 2,973
2026	4,793
2027	2,326
2028	1,791
2029	2,892
After 2029	10,062
Total	$ 24,837

DEBT - Narrative (Details)

DEBT - Narrative (Details)					12 Months Ended
	Nov. 01, 2024 USD ($)	Jul. 02, 2024 USD ($)	Feb. 22, 2024 USD ($)	Feb. 15, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 05, 2024 USD ($) series aircraft	Apr. 16, 2024 USD ($)
Debt Instrument [Line Items]
Repayments of long-term debt					$ 10,138,000,000	$ 4,248,000,000	$ 4,011,000,000
Unrestricted liquidity required for credit agreement					$ 2,000,000,000
Minimum ratio of appraised value of collateral for Credit Agreement					1.6
Secured Debt | Term Loan Facility
Debt Instrument [Line Items]
Repayments of long-term debt		$ 1,800,000,000				$ 1,000,000,000
Proceeds from issuance of debt			$ 2,500,000,000
Secured Debt | 2021 Term Loans
Debt Instrument [Line Items]
Repayments of long-term debt			$ 1,370,000,000
Percent spread on variable rate					2%
Secured Debt | 2024 Term Loans
Debt Instrument [Line Items]
Repayments of long-term debt	$ 400,000,000
Stated interest rate					6.63%
Secured Debt | Aircraft Purchase Financing
Debt Instrument [Line Items]
Aggregate principal amount of debt								$ 1,400,000,000
Number of aircrafts financed | aircraft								48
Number of indenture note series | series								2
Secured Debt | Series AA
Debt Instrument [Line Items]
Stated interest rate								5.45%
Aggregate principal amount of debt								$ 969,000,000
Secured Debt | Series A
Debt Instrument [Line Items]
Stated interest rate								5.875%
Aggregate principal amount of debt								$ 385,000,000
Secured Debt | 2026 Notes
Debt Instrument [Line Items]
Stated interest rate					4.375%
Secured Debt | 2029 Notes
Debt Instrument [Line Items]
Stated interest rate					4.625%
Secured Debt | Aircraft Purchase Financing
Debt Instrument [Line Items]
Proceeds from issuance of debt					$ 1,400,000,000
Secured Debt | Minimum | Aircraft Purchase Financing
Debt Instrument [Line Items]
Percent spread on variable rate					6.17%
Secured Debt | Maximum | Aircraft Purchase Financing
Debt Instrument [Line Items]
Percent spread on variable rate					6.51%
Secured Debt | Secured Overnight Financing Rate (SOFR) | 2024 Term Loans
Debt Instrument [Line Items]
Percent spread on variable rate	2%		2.75%
Debt instrument, interest rate floor			0%
Secured Debt | Other Market Rates | 2024 Term Loans
Debt Instrument [Line Items]
Percent spread on variable rate	1%		1.75%
Debt instrument, interest rate floor			1%
Secured Debt | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, increase (decrease) in maximum borrowing capacity				$ 1,115,000,000					$ 100,000,000
Maximum borrowing capacity				$ 2,865,000,000					2,965,000,000
Maximum borrowing capacity of portion involving extension of maturity									150,000,000
Undrawn and available amount under revolving credit facility					$ 2,965,000,000
Secured Debt | Revolving Credit Facility | Extending Lenders
Debt Instrument [Line Items]
Maximum borrowing capacity									2,950,000,000
Secured Debt | Revolving Credit Facility | Non-Extending Lenders
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 15,000,000
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Secured Overnight Financing Rate (SOFR) | Minimum
Debt Instrument [Line Items]
Percent spread on variable rate				3%
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Secured Overnight Financing Rate (SOFR) | Maximum
Debt Instrument [Line Items]
Percent spread on variable rate				3.50%
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Other Market Rates | Minimum
Debt Instrument [Line Items]
Percent spread on variable rate				2%
Secured Debt | Revolving Credit Facility | Non-Extending Lenders | Other Market Rates | Maximum
Debt Instrument [Line Items]
Percent spread on variable rate				2.50%

LEASES - Components of Lease Co

LEASES - Components of Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease cost	$ 855	$ 925	$ 941
Variable and short-term lease cost	3,592	3,028	2,603
Amortization of finance lease assets	62	52	72
Interest on finance lease liabilities	16	20	13
Sublease income	(35)	(39)	(33)
Total lease cost	$ 4,490	$ 3,986	$ 3,596

LEASES - Narrative (Details)

LEASES - Narrative (Details) $ in Billions	12 Months Ended
	Dec. 31, 2024 USD ($) aircraft	Nov. 30, 2024 USD ($)
Lessee, Lease, Description [Line Items]
Number of aircraft leases under various sale-leaseback transactions	66
Lease terms of additional leases that have not yet commenced (up to)	27 years
Operating And Financing Leases, Lease Not Yet Commenced
Lessee, Lease, Description [Line Items]
Amount of leases that have not yet commenced | $	$ 5.7
City Of Houston, Texas | SFRB
Lessee, Lease, Description [Line Items]
Par amount of debt | $		$ 1.1
Minimum
Lessee, Lease, Description [Line Items]
Term of sale-leaseback transactions	9 months
Minimum | City Of Houston, Texas | SFRB
Lessee, Lease, Description [Line Items]
Stated interest rate		5.25%
Maximum
Lessee, Lease, Description [Line Items]
Term of sale-leaseback transactions	12 years
Maximum | City Of Houston, Texas | SFRB
Lessee, Lease, Description [Line Items]
Stated interest rate		5.50%
Mainline Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft subject to operating leases	66
Number of aircraft subject to finance leases	8
Mainline Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Term of operating leases	1 month
Mainline Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Term of operating leases	12 years
Regional Aircraft
Lessee, Lease, Description [Line Items]
Number of aircraft subject to operating leases	219
Number of aircraft subject to finance leases	21
Non-Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Term of operating leases	1 month
Non-Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Term of operating leases	32 years

LEASES - Summary of Scheduled F

LEASES - Summary of Scheduled Future Minimum Lease Payments under Operating and Finance Leases (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Operating Leases
2025	$ 757
2026	731
2027	926
2028	742
2029	546
After 2029	3,081
Minimum lease payments	6,783
Imputed interest	(1,806)
Present value of minimum lease payments	4,977
Less: current maturities of lease obligations	(467)	$ (576)
Long-term lease obligations	4,510	$ 4,503
Finance Leases
2025	232
2026	33
2027	21
2028	11
2029	5
After 2029	4
Minimum lease payments	306
Imputed interest	(15)
Present value of minimum lease payments	291
Less: current maturities of lease obligations	$ (223)
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current maturities of long-term debt, finance leases, and other financial liabilities
Long-term lease obligations	$ 68
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt, finance leases, and other financial liabilities

LEASES - Future Lease Payment u

LEASES - Future Lease Payment under Terms of Capacity Purchase Agreement (Details) $ in Millions	Dec. 31, 2024 USD ($)
Leases [Abstract]
2025	$ 453
2026	320
2027	610
2028	283
2029	280
After 2029	3,232
Total	5,178
Imputed interest	(1,466)
Less: current maturities of lease obligations	(257)
Other financial liabilities	$ 3,455

LEASES - Additional Information

LEASES - Additional Information Related to Leases (Details)	Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Weighted-average remaining lease term - operating leases	11 years	10 years
Weighted-average remaining lease term - finance leases	2 years	2 years
Weighted-average remaining lease term - other financial liabilities	10 years	10 years
Weighted-average discount rate - operating leases	5.90%	5.80%
Weighted-average discount rate - finance leases	5.90%	6.30%
Weighted-average interest rate - other financial liabilities	5.30%	5.30%

LEASES - Supplemental Cash Flow

LEASES - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 851	$ 874	$ 919
Operating cash flows for finance leases	15	21	13
Financing cash flows for finance leases	$ 269	$ 311	$ 124

COMMITMENTS, CONTINGENCIES AN_3

COMMITMENTS, CONTINGENCIES AND GUARANTEES - Summary of Commitments Related to the Acquisition of Aircraft (Details) - Purchase commitments $ in Billions	Dec. 31, 2024 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2025	$ 9.6
2026	6
2027	4.7
2028	6.5
2029	8.1
After 2029	19.5
Total	$ 54.4

COMMITMENTS, CONTINGENCIES AN_4

COMMITMENTS, CONTINGENCIES AND GUARANTEES - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) employee aircraft option	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Commitments and Contingencies [Line Items]
Carrying amount of loan receivable	$ 72
Liabilities due	$ 4,193	$ 3,835
Number of call options to purchase regional jet aircraft | option	207
Aggregate balance	$ 5,178
Tax-Exempt Special Facilities Revenue Bonds
Commitments and Contingencies [Line Items]
Underlying debt and interest	2,900
Tax-Exempt Special Facilities Revenue Bonds | Indirect Guarantee of Indebtedness
Commitments and Contingencies [Line Items]
Underlying debt and interest	504
Contingent liabilities based on participation	2,700
Floating Rate Debt
Commitments and Contingencies [Line Items]
Long term debt	$ 8,500
Debt instrument, remaining terms	12 years
Loans And Leases From Non-U.S. Entities
Commitments and Contingencies [Line Items]
Debt instrument, remaining terms	12 years
Aggregate balance	$ 5,300
United Airlines, Inc.
Commitments and Contingencies [Line Items]
Liabilities due	$ 4,193	3,835
Number of employees | employee	107,300
Percentage of employees represented by various U.S. labor organizations	82%
United Airlines, Inc. | Surety Bonds
Commitments and Contingencies [Line Items]
Contingent liabilities based on participation	$ 396
United Airlines, Inc. | Regional Aircraft | Capacity Purchase Agreements
Commitments and Contingencies [Line Items]
Expenses related to CPAs	1,100	1,100	$ 900
United Airlines, Inc. | Regional Aircraft | Capacity Purchase Agreements | Related Party
Commitments and Contingencies [Line Items]
Carrying amount of loan receivable	52	84
Liabilities due	$ 110	$ 122
United Airlines, Inc. | Cash Collateralized Letters of Credit
Commitments and Contingencies [Line Items]
Number of regional aircraft | aircraft	412

COMMITMENTS, CONTINGENCIES AN_5

COMMITMENTS, CONTINGENCIES AND GUARANTEES - Schedule of Estimated Future payments of Contractual Obligation (Details) - Future commitments under CPAs $ in Billions	Dec. 31, 2024 USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]
2025	$ 2.7
2026	2.8
2027	2.1
2028	1.8
2029	1.4
After 2029	4.1
Total	$ 14.9

SPECIAL CHARGES - Components of

SPECIAL CHARGES - Components of Special Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring and Related Activities [Abstract]
(Gains) losses on sale of assets and other special charges	$ 112	$ 135	$ 140
Labor contract ratification bonuses	0	814	0
Total operating special charges	112	949	140
Nonoperating unrealized (gains) losses on investments, net	199	(27)	(20)
Nonoperating debt extinguishment and modification fees	128	11	7
Total nonoperating special charges and unrealized (gains) losses on investments, net	327	(16)	(13)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net	439	933	127
Income tax benefit, net of valuation allowance	(54)	(214)	(33)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net of income taxes	$ 385	$ 719	$ 94

SPECIAL CHARGES - Narrative (De

SPECIAL CHARGES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring and Related Activities [Abstract]
Charges related to prepayment, refinancing and partial prepayment of debt	$ 128	$ 11	$ 7
Expense associated with employee agreements	$ 0	$ 814	$ 0