Frontier (ULCC) 10-Q 3 May 23 2023 Q1 Quarterly report Financial data

Cover

Cover - shares	3 Months Ended
	Mar. 31, 2023	Apr. 28, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2023
Document Transition Report	false
Entity File Number	001-40304
Entity Registrant Name	Frontier Group Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-3681866
Entity Address, Address Line One	4545 Airport Way
Entity Address, City or Town	Denver
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80239
City Area Code	720
Local Phone Number	374-4490
Title of 12(b) Security	Common Stock, $0.001 par value per share
Trading Symbol	ULCC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		218,516,579
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001670076
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Current Assets
Cash and cash equivalents	$ 790	$ 761
Accounts receivable, net	96	90
Supplies, net	57	55
Other current assets	99	114
Total current assets	1,042	1,020
Property and equipment, net	242	226
Operating lease right-of-use assets	2,623	2,484
Pre-delivery deposits for flight equipment	348	371
Aircraft maintenance deposits	85	105
Intangible assets, net	28	28
Other assets	302	265
Total assets	4,670	4,499
Liabilities and stockholders’ equity
Accounts payable	79	89
Air traffic liability	424	313
Frequent flyer liability	12	13
Current maturities of long-term debt, net	215	157
Current maturities of operating leases	487	465
Other current liabilities	463	518
Total current liabilities	1,680	1,555
Long-term debt, net	212	272
Long-term operating leases	2,152	2,034
Long-term frequent flyer liability	32	32
Other long-term liabilities	106	97
Total liabilities	4,182	3,990
Commitments and contingencies
Stockholders' equity
Common stock, $0.001 par value per share, with 218,503,854 and 217,875,890 shares issued and outstanding as of March 31, 2023 and December 31, 2022, respectively	0	0
Additional paid-in capital	392	393
Retained earnings	109	122
Accumulated other comprehensive income (loss)	(13)	(6)
Total stockholders’ equity	488	509
Total liabilities and stockholders’ equity	$ 4,670	$ 4,499

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Common stock, stated par (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares issued (in shares)	218,503,854	217,875,890
Common stock outstanding (in shares)	218,503,854	217,875,890

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating revenues:
Total operating revenues	$ 848,000	$ 605,000
Operating expenses:
Aircraft fuel	292,000	215,000
Salaries, wages and benefits	203,000	172,000
Aircraft rent	131,000	128,000
Station operations	124,000	105,000
Sales and marketing	40,000	32,000
Maintenance, materials and repairs	45,000	34,000
Depreciation and amortization	11,000	13,000
Transaction and merger-related costs	1,000	11,000
Other operating	26,000	48,000
Total operating expenses	873,000	758,000
Operating income (loss)	(25,000)	(153,000)
Other income (expense):
Interest expense	(6,000)	(9,000)
Capitalized interest	6,000	1,000
Interest income and other	8,000	0
Total other income (expense)	8,000	(8,000)
Income (loss) before income taxes	(17,000)	(161,000)
Income tax expense (benefit)	(4,000)	(40,000)
Net income (loss)	$ (13,000)	$ (121,000)
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.06)	$ (0.56)
Diluted (in dollars per share)	$ (0.06)	$ (0.56)
Passenger
Operating revenues:
Total operating revenues	$ 830,000	$ 588,000
Other
Operating revenues:
Total operating revenues	$ 18,000	$ 17,000

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (13,000)	$ (121,000)
Other comprehensive loss
Unrealized gains (losses) and amortization from cash flow hedges, net of deferred tax benefit/(expense) of $2 for the three months ended March 31, 2023 and less than $1 million for the three months ended March 31, 2022. (Note 4)	(7,000)	0
Other comprehensive income (loss)	(7,000)	0
Comprehensive income (loss)	$ (20,000)	$ (121,000)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Unrealized losses from cash flow hedges net of adjustment for de-designation of fuel hedges, tax benefit/(expense)	$ 2	$ 1

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ (13,000)	$ (121,000)
Deferred income taxes	(4,000)	(40,000)
Depreciation and amortization	11,000	13,000
Gains recognized on sale-leaseback transactions	(40,000)	(7,000)
Loss on extinguishment of debt	0	7,000
Stock-based compensation	4,000	3,000
Changes in operating assets and liabilities:
Accounts receivable	19,000	(9,000)
Supplies and other current assets	0	(13,000)
Aircraft maintenance deposits	(4,000)	(4,000)
Other long-term assets	(37,000)	(17,000)
Accounts payable	(8,000)	5,000
Air traffic liability	111,000	90,000
Other liabilities	(64,000)	6,000
Cash provided by (used in) operating activities	(25,000)	(87,000)
Cash flows from investing activities:
Capital expenditures	(11,000)	(7,000)
Pre-delivery deposits for flight equipment, net of refunds	23,000	(25,000)
Other	(2,000)	(1,000)
Cash provided by (used in) investing activities	10,000	(33,000)
Cash flows from financing activities:
Proceeds from issuance of debt, net of issuance costs	36,000	97,000
Principal repayments on debt	(38,000)	(165,000)
Proceeds from sale-leaseback transactions	51,000	0
Minimum tax withholdings on share-based awards	(5,000)	(3,000)
Cash provided by (used in) financing activities	44,000	(71,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	29,000	(191,000)
Cash, cash equivalents and restricted cash, beginning of period	761,000	918,000
Cash, cash equivalents and restricted cash, end of period	$ 790,000	$ 727,000

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Stockholders’ Equity - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Beginning balance (in shares) at Dec. 31, 2021		217,065,096
Beginning balance at Dec. 31, 2021	$ 530,000	$ 0	$ 381,000	$ 159,000	$ (10,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(121,000)			(121,000)
Shares issued in connection with vesting of restricted stock units (in shares)		676,146
Shares withheld to cover employee taxes on vested restricted stock units (in shares)		(275,822)
Shares withheld to cover employee taxes on vested restricted stock units	(3,000)		(3,000)
Stock option exercise (in shares)		34,461
Stock-based compensation	3,000		3,000
Ending balance (in shares) at Mar. 31, 2022		217,499,881
Ending balance at Mar. 31, 2022	$ 409,000	$ 0	381,000	38,000	(10,000)
Beginning balance (in shares) at Dec. 31, 2022	217,875,890	217,875,890
Beginning balance at Dec. 31, 2022	$ 509,000	$ 0	393,000	122,000	(6,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(13,000)			(13,000)
Shares issued in connection with vesting of restricted stock units (in shares)		976,916
Shares withheld to cover employee taxes on vested restricted stock units (in shares)		(402,814)
Shares withheld to cover employee taxes on vested restricted stock units	(5,000)		(5,000)
Unrealized loss from cash flows hedges, net of tax	$ (7,000)				(7,000)
Stock option exercise (in shares)	53,862	53,862
Stock-based compensation	$ 4,000		4,000
Ending balance (in shares) at Mar. 31, 2023	218,503,854	218,503,854
Ending balance at Mar. 31, 2023	$ 488,000	$ 0	$ 392,000	$ 109,000	$ (13,000)

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The condensed consolidated financial statements have been prepared in accordance with the generally accepted accounting principles in the United States (“GAAP”) and include the accounts of Frontier Group Holdings, Inc. (“FGHI” or the “Company”) and its wholly-owned direct and indirect subsidiaries, including Frontier Airlines Holdings, Inc. (“FAH”) and Frontier Airlines, Inc. (“Frontier”). All wholly-owned subsidiaries are consolidated, with all intercompany transactions and balances being eliminated. The Company is an ultra low-cost, low-fare airline headquartered in Denver, Colorado that offers flights throughout the United States and to select international destinations in the Americas, serving approximately 100 airports. The Company is managed as a single business unit that provides air transportation for passengers. Management has concluded there is only one reportable segment. The accompanying condensed consolidated financial statements include the accounts of the Company and reflect all normal recurring adjustments which management believes are necessary to fairly present the financial position, results of operations and cash flows of the Company for the respective periods presented. Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for Form 10-Q. These unaudited interim condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements of the Company and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022, which was filed with the SEC on February 22, 2023 (the “2022 Annual Report”). The interim results reflected in the unaudited condensed consolidated financial statements are not necessarily indicative of the results that may be expected for other interim periods or for the full year. The air transportation business is subject to significant seasonal fluctuations and is volatile and highly affected by economic cycles and trends. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results could differ from those estimates.

Revenue Recognition

Revenue Recognition	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition As of March 31, 2023 and December 31, 2022, the Company’s air traffic liability balance was $430 million and $328 million, respectively, which includes amounts classified in other long-term liabilities. During the three months ended March 31, 2023, 87% of the air traffic liability as of December 31, 2022 was recognized as passenger revenue within the Company’s condensed consolidated statements of operations. Of the air traffic liability balances as of March 31, 2023 and December 31, 2022, $76 million and $60 million, respectively, was related to unearned membership fees. During the three months ended March 31, 2023 and 2022, the Company recognized $10 million and $22 million, respectively, in passenger revenues within the Company’s condensed consolidated statements of operations, related to expected and actual expiration of customer rights to book future travel. Operating revenues are comprised of passenger revenues, which includes fare and non-fare passenger revenues, and other revenues. Disaggregated operating revenues are as follows (in millions): Three Months Ended March 31, 2023 2022 Passenger revenues: Fare $ 303 $ 229 Non-fare passenger revenues: Baggage 221 130 Service fees 217 162 Seat selection 72 54 Other 17 13 Total non-fare passenger revenue 527 359 Total passenger revenues 830 588 Other revenues 18 17 Total operating revenues $ 848 $ 605 The Company is managed as a single business unit that provides air transportation for passengers. Operating revenues by principal geographic region, as defined by the U.S. Department of Transportation (the “DOT”), are as follows (in millions): Three Months Ended March 31, 2023 2022 Domestic $ 781 $ 546 Latin America 67 59 Total operating revenues $ 848 $ 605 The Company attributes operating revenues by geographic region based upon the origin and destination of each passenger flight segment. The Company’s tangible assets consist primarily of flight equipment, which are mobile across geographic markets. Accordingly, assets are not allocated to specific geographic regions. Frequent Flyer Program The Company’s Frontier Miles frequent flyer program provides frequent flyer travel awards to program members based on accumulated mileage credits. Mileage credits are generally accumulated as a result of travel, purchases using the co-branded credit card and purchases from other participating partners. The Company defers revenue for mileage credits earned by passengers under its Frontier Miles program based on the equivalent ticket value a passenger receives by redeeming mileage credits for a ticket rather than paying cash. The Company has a credit card affinity agreement with its credit card partner, Barclays Bank Delaware (“Barclays”), through 2029, which provides for joint marketing, grants certain benefits to co-branded credit cardholders (“Cardholders”) and allows Barclays to market using the Company’s customer database. Cardholders earn mileage credits under the Frontier Miles

Other Current Assets

Other Current Assets	3 Months Ended
	Mar. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets	Other Current Assets Other current assets consist of the following (in millions): March 31, 2023 December 31, 2022 Supplier incentives $ 53 $ 55 Prepaid expenses 27 20 Derivative instruments 9 24 Income tax and other taxes receivable 5 8 Other 5 7 Total other current assets $ 99 $ 114

Financial Derivative Instrument

Financial Derivative Instruments and Risk Management	3 Months Ended
	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Derivative Instruments and Risk Management	Financial Derivative Instruments and Risk Management The Company may be exposed to interest rate risk through aircraft and spare engine lease contracts for the time period between agreement of terms and commencement of the lease, when portions of rental payments can be adjusted and become fixed based on the swap rate. As part of its risk management program, the Company enters into contracts in order to limit the exposure to fluctuations in interest rates. During the three months ended March 31, 2023 and 2022, respectively, the Company did not enter into any swaps and, therefore, paid no upfront premiums. As of March 31, 2023 the Company hedged the interest rate exposure on $451 million of total aircraft and spare engine rent for 11 aircraft and 3 engines, respectively, to be delivered by the end of 2023. Additionally, the Company is exposed to credit losses in the event of nonperformance by counterparties to its derivative instruments but does not expect that any of its counterparties will fail to meet their respective obligations. The amount of such credit exposure is generally the fair value of the Company’s outstanding contracts in a receivable position. To manage credit risks, the Company selects counterparties based on credit assessments and monitors the market position with each counterparty. The assets associated with the Company’s derivative instruments are presented on a gross basis and include upfront premiums paid. These assets are recorded as a component of other current assets on the Company’s condensed consolidated balance sheets. There were $9 million and $24 million of assets outstanding as of March 31, 2023 and December 31, 2022, respectively. Amortization of cash flow hedges, net of tax was less than $1 million for the three months ended March 31, 2023 and 2022, respectively, as reflected in aircraft rent expense within the Company’s condensed consolidated statements of operations. The following table presents the net of tax impact of the overall effectiveness of derivative instruments designated as cash flow hedging instruments within the Company’s condensed consolidated statements of comprehensive income (loss) (in millions): Three Months Ended March 31, 2023 2022 Derivatives designated as cash flow hedges Interest rate derivative contract gains (losses), net of tax $ (7) $ —

Other Current Liabilities

Other Current Liabilities	3 Months Ended
	Mar. 31, 2023
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	Other Current Liabilities Other current liabilities consist of the following (in millions): March 31, 2023 December 31, 2022 Passenger and other taxes and fees payable $ 138 $ 113 Salaries, wages and benefits 101 104 Aircraft maintenance 71 63 Station obligations 47 57 Fuel liabilities 31 34 Leased aircraft return costs 20 84 Other current liabilities 55 63 Total other current liabilities $ 463 $ 518

Debt

Debt	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Debt	Debt The Company’s debt obligations are as follows (in millions): March 31, 2023 December 31, 2022 Secured debt: Pre-delivery credit facility (a) $ 266 $ 277 Floating rate building note (b) 17 17 Unsecured debt: Affinity card advance purchase of mileage credits (c) 80 71 PSP Promissory Notes (d) 66 66 Total debt 429 431 Less current maturities of long-term debt (215) (157) Less debt acquisition costs and other discounts, net (2) (2) Long-term debt, net $ 212 $ 272 __________________ (a) The Company, through an affiliate, entered into the pre-delivery payment (“PDP”) facility with Citibank, N.A., as facility agent, in December 2014 (as amended, the “PDP Financing Facility”). The PDP Financing Facility is primarily collateralized by the Company’s purchase agreement for Airbus A320 family aircraft deliveries (see Note 9) through the term of the facility, which extends through December 2025. As of March 31, 2023, the PDP Financing Facility allows for total commitments up to $270 million. Interest is paid every 90 days based on the Secured Overnight Financing Rate ("SOFR") plus a margin for each individual tranche. The PDP Financing Facility consists of separate loans for each PDP aircraft. Each separate loan matures upon the earlier of (i) delivery of that aircraft to the Company by Airbus, (ii) the date one month following the last day of the scheduled delivery month of such aircraft and (iii) if there is a delay in delivery of aircraft, depending on the cause of the delivery delay, up to six months following the last day of the scheduled delivery month of such aircraft. The PDP Financing Facility will be repaid periodically according to the preceding sentence, with the last scheduled delivery of aircraft expected to be in the fourth quarter of 2025. (b) Represents a note with a commercial bank related to the Company’s headquarters building. Under the terms of the note, the Company began repaying the outstanding principal balance with quarterly payments beginning in January 2022 and continuing until the maturity date in December 2023. On the maturity date, one final balloon payment will be made to cover all unpaid principal, accrued unpaid interest and other amounts due. The interest rate of one-month London Interbank Offered Rate (“ LIBOR”) plus a margin is payable monthly. (c) The Company entered into an agreement with Barclays in 2003 which, as amended, provides for joint marketing, grants certain benefits to Cardholders and allows Barclays to market using the Company’s customer database, through 2029. Cardholders earn mileage credits under the Frontier Miles program and the Company sells mileage credits at agreed-upon rates to Barclays and earns fees from Barclays for the acquisition, retention and use of the co-branded credit card by Cardholders. In addition, Barclays will pre-purchase miles if the Company meets certain conditions precedent. The pre-purchased miles facility amount is to be reset on January 15 of each calendar year through, and including, January 15, 2028, based on the aggregate amount of fees payable by Barclays to the Company on a calendar year basis, up to an aggregate maximum facility amount of $200 million. The Company pays interest on a monthly basis, which is based on a one-month LIBOR plus a margin. Beginning March 31, 2028, the facility is scheduled to be repaid in 12 equal monthly installments. (d) As a result of the Company’s participation in the payroll support programs offered by the U.S. Department of the Treasury (the “Treasury”), the Company obtained a series of 10-year, low-interest loans from the Treasury (collectively, the “PSP Promissory Notes”) that are due between 2030 to 2031. The PSP Promissory Notes include an annual interest rate of 1.00% for the first five years and the SOFR plus 2.00% in the final five years, with bi-annual interest payments. The loans can be prepaid at par at any time without incurring a penalty. In connection with the term loan facility entered into with the Treasury on September 28, 2020 (the “Treasury Loan”), which was repaid in full on February 2, 2022, and the PSP Promissory Notes, the Company issued to the Treasury warrants to purchase 3,117,940 shares of FGHI common stock at a weighted-average price of $6.95 per share. The Treasury has not exercised any warrants as of March 31, 2023. Cash payments for interest related to debt was $6 million and $2 million for the three months ended March 31, 2023 and 2022, respectively. The Company has issued standby letters of credit and surety bonds to various airport authorities and vendors that are collateralized by a portion of the Company’s property and equipment and, as of March 31, 2023 and December 31, 2022, the Company did not have any outstanding letters of credit that were drawn upon. As of March 31, 2023, future maturities of debt are payable as follows (in millions): March 31, 2023 Remainder of 2023 $ 127 2024 147 2025 9 2026 — 2027 — Thereafter 146 Total debt principal payments $ 429 The Company continues to monitor covenant compliance with various parties, including, but not limited to, its lenders and credit card processors, and as of March 31, 2023, the Company is in compliance with all of its covenants.

Operating Leases

Operating Leases	3 Months Ended
	Mar. 31, 2023
Leases [Abstract]
Operating Leases	Operating Leases The Company leases property and equipment under operating leases. For leases with initial terms greater than 12 months, the related operating lease right-of-use asset and corresponding operating lease liability are recorded at the present value of lease payments over the term on the Company’s condensed consolidated balance sheets. Some leases include rental escalation clauses, renewal options, termination options and/or other items that cause variability that are factored into the determination of lease payments, when appropriate. The Company does not separate lease and non-lease components of contracts, except for certain flight training equipment, for which consideration is allocated between lease and non-lease components. Aircraft As of March 31, 2023, the Company leased 125 aircraft with remaining terms ranging from one month to 12 years, all of which are under operating leases and are included within operating lease right-of-use assets and operating lease liabilities on the Company’s condensed consolidated balance sheets. In addition, as of March 31, 2023, the Company leased 30 spare engines which are all under operating leases, with the remaining term ranging from one month to 12 years. As of March 31, 2023, the lease rates for 12 of the engines depend on usage-based metrics which are variable and, as such, these leases are not recorded on the Company’s condensed consolidated balance sheets as operating lease right-of-use assets or as operating lease liabilities. During the three months ended March 31, 2023 and 2022, the Company executed sale-leaseback transactions with third-party lessors for three and two new Airbus A320neo family aircraft, respectively, and also entered into direct leases for three new Airbus A320neo family aircraft during the three months ended March 31, 2023. Additionally, the Company completed a sale-leaseback transaction for one engine during the three months ended March 31, 2023 and did not complete a sale-leaseback transaction for any engines during the three months ended March 31, 2022. All of the leases from the sale-leaseback transactions are accounted for as operating leases. The Company recognized net sale-leaseback gains from those sale-leaseback transactions of $40 million and $7 million during the three months ended March 31, 2023 and 2022, respectively, which are included as a component of other operating expenses within the Company’s condensed consolidated statements of operations. Aircraft Rent Expense and Maintenance Obligations During the three months ended March 31, 2023 and 2022, aircraft rent expense was $131 million and $128 million, respectively. Aircraft rent expense includes supplemental rent, which is made up of maintenance reserves paid or to be paid that are not probable of being reimbursed and probable lease return condition obligations. Supplemental rent expense (benefit) for maintenance-related reserves that were deemed non-recoverable, and any impact from changes in those estimates, was less than $1 million for each of the three months ended March 31, 2023 and 2022. The portion of supplemental rent expense related to probable lease return condition obligations was $2 million and $15 million for the three months ended March 31, 2023 and 2022, respectively. As of March 31, 2023 and December 31, 2022, the Company’s total leased aircraft return cost liability was $47 million and $102 million, respectively, which are reflected in other current liabilities and other long-term liabilities within the Company’s condensed consolidated balance sheets. Additionally, certain of the Company’s aircraft lease agreements require the Company to pay maintenance reserves to aircraft lessors to be held as collateral in advance of the Company’s required performance of major maintenance activities. As of March 31, 2023 and December 31, 2022, the Company had aircraft maintenance deposits that are expected to be recoverable of $121 million and $117 million, respectively, on the Company’s condensed consolidated balance sheets, of which $36 million and $12 million, respectively, are included in accounts receivable, net on the Company’s condensed consolidated balance sheets as the eligible maintenance has been performed. The remaining $85 million and $105 million are included within aircraft maintenance deposits on the Company’s condensed consolidated balance sheets as of March 31, 2023 and December 31, 2022, respectively. A majority of these maintenance reserve payments are calculated based on a utilization measure, such as flight hours or cycles. Maintenance reserves collateralize the lessor for maintenance time run off the aircraft until the completion of the maintenance of the aircraft. As of March 31, 2023, fixed maintenance reserve payments for aircraft and spare engines, including estimated amounts for contractual price escalations, were expected to be $2 million for the remainder of 2023, $3 million per year for 2024 through 2026, $5 million for 2027 and $5 million thereafter, before consideration of reimbursements. During the quarter ended March 31, 2023, the Company extended the term for certain aircraft operating leases that were slated to expire in the fourth quarter of 2023. For the three months ended March 31, 2023, the Company recorded an $18 million benefit to aircraft rent in the Company’s condensed consolidated statement of operations related to previously accrued lease return costs that were variable in nature associated with the anticipated utilization and condition of the airframes and engines at original return date, that given the extension of these leases, such variable return costs are no longer probable of occurrence. Airport Facilities The Company’s facility leases are primarily for space at approximately 100 airports that are primarily located in the United States. These leases are classified as operating leases and reflect the use of airport terminals, ticket counters, office space, and maintenance facilities. Generally, this space is leased from government agencies that control the use of the airport. The majority of these leases are short-term in nature and renew on an evergreen basis. For these leases, the contractual term is used as the lease term. As of March 31, 2023, the remaining lease terms vary from one month to 12 years. At the majority of the U.S. airports, the lease rates depend on airport operating costs or use of the facilities and are reset at least annually, and because of the variable nature of the rates, these leases are not recorded on the Company’s condensed consolidated balance sheets as right-of-use assets and lease liabilities. Other Ground Property and Equipment The Company leases certain other assets such as flight training equipment, building space, and various other equipment. Certain of the Company’s leases for other assets are deemed to contain fixed rental payments and, as such, are classified as operating leases and are recorded on the Company’s condensed consolidated balance sheets as a right-of-use asset and liability. The remaining lease terms ranged from one month to nine years as of March 31, 2023. Lessor Concessions In response to the COVID-19 pandemic, beginning in 2020, the Company was granted payment deferrals on leases included in the Company’s right-of-use assets for certain aircraft and engines from lessors along with airport facilities and other vendors that are not included in the Company’s right-of-use assets. As these deferred payments are made, the Company will recognize the deferred payments in aircraft rent or station operations, as applicable, in the Company’s condensed consolidated statements of operations. The payback of all previous aircraft and engine rent deferrals was completed as of December 31, 2021, and, therefore, there was no impact to aircraft rent within the Company’s condensed consolidated statements of operations for the three months ended March 31, 2023 and 2022. The payback of station deferrals decreased operating cash flows and unfavorably impacted station operations within the Company’s results of operations by $1 million for the three months ended March 31, 2023. No payback of station deferrals occurred for the three months ended March 31, 2022. As of March 31, 2023, the Company had $7 million in station deferrals which will be recognized to station operations within the Company’s consolidated statements of operations in future periods as the deferrals are repaid. Lease Costs The table below presents certain information related to lease costs for operating leases during the three months ended March 31, 2023 and 2022 (in millions): Three Months Ended March 31, 2023 2022 Operating lease cost (a) $ 127 $ 117 Variable lease cost (a) 74 55 Total lease costs $ 201 $ 172 ______________ (a) Expenses are included within aircraft rent, station operations, maintenance, materials and repairs and other operating within the Company’s condensed consolidated statements of operations. During the three months ended March 31, 2023 and 2022, the Company acquired, through new or modified operating leases, operating lease assets totaling $231 million and $61 million, respectively, which are included in operating lease right-of-use assets on the Company’s condensed consolidated balance sheets. During the three months ended March 31, 2023 and 2022, the Company paid cash of $127 million and $117 million, respectively, for amounts included in the measurement of lease liabilities.

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation During the three months ended March 31, 2023 and 2022, the Company recognized $4 million and $3 million, respectively, in stock-based compensation expense, which is included as a component of salaries, wages and benefits within the Company’s condensed consolidated statements of operations. Stock Options and Restricted Awards There were no stock options granted during the three months ended March 31, 2023. During the three months ended March 31, 2023, 53,862 vested stock options were exercised with a weighted-average exercise price of $2.32 per share. As of March 31, 2023, the weighted-average exercise price of outstanding options was $1.96 per share. During the three months ended March 31, 2023, 922,023 restricted stock units were issued with a weighted-average grant date fair value of $13.60 per share. During the three months ended March 31, 2023, 976,916 restricted stock units vested, of which 402,814 restricted stock units were withheld to cover employee taxes, with a weighted-average grant date fair value of $12.27 and $12.28 per share, respectively. Phantom Equity Awards On December 3, 2013, to give effect to the reorganization of the Company’s corporate structure, an agreement was reached to amend and restate a phantom equity agreement with the Company’s pilots. Under the terms of this agreement, when an amendment to the underlying collective bargaining agreement was approved, the Company’s pilots employed in June 2011 (the “Participating Pilots”), through their agent, FAPAInvest, LLC, received phantom equity units. Each unit represented the right to receive common stock or cash in connection with certain events, including a qualifying initial public offering, such stock to be distributed or cash paid to the Participating Pilots in 2020 and 2022 based on a predetermined formula. In accordance with the amended and restated phantom equity agreement, the obligation became fixed as of December 31, 2019 and was no longer subject to valuation adjustments. As of December 31, 2021, the remaining liability was $26 million and presented within other current liabilities on the Company’s condensed consolidated balance sheet. During the three months ended March 31, 2022, the remaining liability of $26 million was fully paid. Stockholders’ Equity As of March 31, 2023 and December 31, 2022, the Company had authorized common stock (voting), common stock (non-voting) and preferred stock of 750,000,000, 150,000,000 and 10,000,000 shares, respectively, of which only common stock (voting) were issued and outstanding. All classes of equity have a par value of $0.001 per share.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Flight Equipment Commitments As of March 31, 2023, the Company’s firm aircraft and engine purchase orders consisted of the following: A320neo A321neo (a) Total Aircraft (a) Engines Year Ending Remainder of 2023 — 10 10 3 2024 — 33 33 2 2025 17 13 30 4 2026 19 22 41 4 2027 21 21 42 3 Thereafter 10 52 62 2 Total 67 151 218 18 ______________ (a) The schedule presented reflects the contractual delivery dates as of March 31, 2023 and does not reflect the notification of aircraft delivery delays communicated by Airbus on May 3, 2023 which delays the Company’s scheduled A321neo deliveries between the second quarter of 2023 and fourth quarter of 2024. Pursuant to this notification received from Airbus, seven aircraft deliveries expected in 2023 shifted by an average of one month, resulting in two A321neo aircraft shifting from 2023 into 2024 and also shifting 11 A321neo aircraft from 2024 to 2025. Such delays in the scheduled deliveries of Airbus aircraft may persist in future periods. As of March 31, 2023, all of the aircraft under the original master purchase agreement with Airbus (“backlog aircraft”) have been received. During December 2017, the Company entered into an amendment to the previously existing master purchase agreement, under which the Company has a commitment to purchase a remaining incremental 67 A320neo and 60 A321neo aircraft (“incremental aircraft”), with the first delivery occurring in September 2022 and the remaining expected to be delivered through 2028, per the latest delivery schedule. During October 2019, the Company entered into an amendment to the previously existing master purchase agreement that allows the Company the option to convert 18 A320neo aircraft to A321XLR aircraft. The conversion right is available until June 2023, per the latest amendment, and is not reflected in the table above as this option has not been exercised. Each of the Company’s amended agreements with Airbus provide for, among other things, varying purchase incentives for each aircraft type (e.g., A320neo versus A321neo), which are allocated proportionally by aircraft type over the remaining aircraft to be delivered so that each aircraft’s capitalized cost upon induction would be equal. Therefore, as cash paid for deliveries is greater than the capitalized cost due to the allocation of these purchase incentives, a deferred purchase incentive is recognized within other assets on the Company’s condensed consolidated balance sheets, which will ultimately be offset by future deliveries of aircraft with lower cash payments than their associated capitalized cost. In November 2021, the Company entered into an amendment with Airbus to add an additional 91 A321neo aircraft (“supplemental aircraft”) to the committed purchase agreement, with deliveries expected to begin in 2025, continuing through 2029 per the latest delivery schedule. In April 2022, the agreement with Pratt & Whitney, the provider of engines for the Company’s incremental order book, was amended to include additional spare engine commitments and adjust the timing of remaining deliveries, which has been reflected in the table above. As of March 31, 2023, purchase commitments for these aircraft and engines, including estimated amounts for contractual price escalations and PDPs, were approximately $589 million for the remainder of 2023, $1,974 million in 2024, $1,767 million in 2025, $2,358 million in 2026, $2,448 million in 2027 and $3,759 million thereafter. As of March 31, 2023, the Company had signed lease agreements with two of its leasing partners to add ten additional A321neo aircraft through direct leases. Three deliveries occurred in the first quarter of 2023, with the remainder continuing into the third quarter of 2023, based on the latest delivery schedule. None of these ten aircraft are reflected in the table above given these are not purchase orders. Litigation and Other Contingencies The Company is subject to commercial litigation claims and to administrative and regulatory proceedings and reviews that may be asserted or maintained from time to time. The Company regularly evaluates the status of such matters to assess whether a loss is probable and reasonably estimable in determining whether an accrual is appropriate. Furthermore, in determining whether disclosure is appropriate, the Company evaluates each matter to assess if there is at least a reasonable possibility that a loss or additional losses may have been incurred and whether an estimate of possible loss or range of loss can be made. The Company believes the ultimate outcome of such lawsuits, proceedings and reviews will not, individually or in the aggregate, have a material adverse effect on its condensed consolidated financial position, liquidity or results of operations and that the Company’s current accruals cover matters where loss is deemed probable and can be reasonably estimated. The ultimate outcome of legal actions is unpredictable and can be subject to significant uncertainties, and it is difficult to determine whether any loss is probable or even possible. Additionally, it is also difficult to estimate the amount of loss and there may be matters for which a loss is probable or reasonably possible but not currently estimable. Thus, actual losses may be in excess of any recorded liability or the range of reasonably possible loss. Employees The Company has seven union-represented employee groups that together represented approximately 87% of all employees as of March 31, 2023. The table below sets forth the Company’s employee groups and status of the collective bargaining agreements as of March 31, 2023: Percentage of Workforce Employee Group Representative Amendable Date (a) March 31, 2023 Pilots Air Line Pilots Association (ALPA) January 2024 31% Flight Attendants Association of Flight Attendants (AFA-CWA) May 2024 51% Aircraft Technicians International Brotherhood of Teamsters (IBT) May 2025 3% Aircraft Appearance Agents IBT October 2023 1% Dispatchers Transport Workers Union (TWU) December 2021 (b) 1% Material Specialists IBT March 2022 (b) <1% Maintenance Controllers IBT October 2023 <1% __________________ (a) Subject to standard early opener provisions. (b) The Company’s collective bargaining agreements with its dispatchers and material specialists, represented by TWU and IBT, respectively, were still amendable as of March 31, 2023 and negotiations are ongoing; however, each agreement is operating under its current arrangement until an amendment has been reached. The Company is self-insured for health care claims, subject to a stop-loss policy, for eligible participating employees and qualified dependent medical and dental claims, subject to deductibles and limitations. The Company’s liabilities for claims incurred but not reported are determined based on an estimate of the ultimate aggregate liability for claims incurred. The estimate is calculated from actual claim rates and adjusted periodically as necessary. The Company had accrued $5 million for health care claims estimated to be incurred but not yet paid, as of March 31, 2023 and December 31, 2022, which are included as a component of other current liabilities on the Company’s condensed consolidated balance sheets. General Indemnifications The Company has various leases with respect to real property as well as various agreements among airlines relating to fuel consortia or fuel farms at airports. Under some of these contracts, the Company is party to joint and several liability regarding environmental damages. Under others, where the Company is a member of an LLC or other entity that contracts directly with the airport operator, liabilities are borne through the fuel consortia structure. The Company’s aircraft, services, equipment lease and sale and financing agreements typically contain provisions requiring the Company, as the lessee, obligor or recipient of services, to indemnify the other parties to those agreements, including certain of those parties’ related persons, against virtually any liabilities that might arise from the use or operation of the aircraft or such other equipment. The Company believes that its insurance would cover most of its exposure to liabilities and related indemnities associated with the commercial real estate leases and aircraft, services, equipment lease and sale and financing agreements described above. Certain of the Company’s aircraft and other financing transactions include provisions that require payments to preserve an expected economic return to the lenders if that economic return is diminished due to certain changes in law or regulations. In certain of these financing transactions and other agreements, the Company also bears the risk of certain changes in tax laws that would subject payments to non-U.S. entities to withholding taxes. Certain of these indemnities survive the length of the related financing or lease. The Company cannot reasonably estimate the potential future payments under the indemnities and related provisions described above because it cannot predict (i) when and under what circumstances these provisions may be triggered, and (ii) the amount that would be payable if the provisions were triggered because the amounts would be based on facts and circumstances existing at such time.

Net Earnings (Loss) per Share

Net Earnings (Loss) per Share	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Net Earnings (Loss) per Share	Net Earnings (Loss) per ShareBasic and diluted earnings (loss) per share are computed pursuant to the two-class method. Under the two-class method, the Company attributes net income to common stock and other participating rights (including those with vested share-based awards). Basic net earnings per share is calculated by taking net income, less earnings allocated to participating rights, divided by the basic weighted-average common stock outstanding. Net loss per share is calculated by taking net loss divided by basic weighted-average common stock outstanding as participating rights do not share in losses. In accordance with the two-class method, diluted net earnings (loss) per share is calculated using the more dilutive impact of the treasury-stock method or from reducing net income for the earnings allocated to participating rights. The following table sets forth the computation of net earnings (loss) per share on a basic and diluted basis pursuant to the two-class method for the periods indicated (in millions, except for share and per share amounts): Three Months Ended March 31, 2023 2022 Basic: Net income (loss) $ (13) $ (121) Less: net income attributable to participating rights — — Net income (loss) attributable to common stockholders $ (13) $ (121) Weighted-average common shares outstanding, basic 218,181,386 217,264,414 Net earnings (loss) per share, basic $ (0.06) $ (0.56) Diluted: Net income (loss) $ (13) $ (121) Less: net income attributable to participating rights — — Net income (loss) attributable to common stockholders $ (13) $ (121) Weighted-average common shares outstanding, basic 218,181,386 217,264,414 Effect of dilutive potential common shares — — Weighted-average common shares outstanding, diluted 218,181,386 217,264,414 Net earnings (loss) per share, diluted $ (0.06) $ (0.56) Due to the net loss for the three months ended March 31, 2023 and 2022, diluted weighted-average shares outstanding are equal to basic weighted-average shares because the effect of all equity awards is anti-dilutive.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Under ASC 820, Fair Value Measurements and Disclosures , disclosures relating to how fair value is determined for assets and liabilities are required, and a hierarchy for which these assets and liabilities must be grouped is established, based on significant levels of inputs, as follows: Level 1—Quoted prices in active markets for identical assets or liabilities. Level 2—Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes several valuation techniques in order to assess the fair value of its financial assets and liabilities. Cash, Cash Equivalents and Restricted Cash Cash, cash equivalents and restricted cash are comprised of liquid money market funds, time deposits and cash, and are categorized as Level 1 instruments. The Company maintains cash with various high-quality financial institutions and holds restricted cash to secure medical claims paid. Cash, cash equivalents and restricted cash are carried at cost, which management believes approximates fair value. As of March 31, 2023 and 2022, the Company had less than $1 million of restricted cash. Interest Rate Derivative Contracts Interest rate derivative contracts are valued under an income approach based on data either readily observable in public markets, derived from public markets or provided by counterparties who regularly trade in public markets and, therefore, they are classified as Level 2 inputs. Given the swaptions will be cash-settled upon exercise and that the market value will be determined using overnight indexed swap (“OIS”) discounting, OIS discounting is applied to the income approach valuation. Debt The estimated fair value of the Company’s debt agreements has been determined to be Level 3 measurement, as certain inputs used to determine the fair value of these agreements are unobservable. The Company utilizes a discounted cash flow method to estimate the fair value of the Level 3 debt. The carrying amounts and estimated fair values of the Company’s debt are as follows (in millions): March 31, 2023 December 31, 2022 Carrying Estimated Fair Value Carrying Value Estimated Fair Value Secured debt: Pre-delivery credit facility $ 266 $ 265 $ 277 $ 277 Floating rate building note 17 17 17 17 Unsecured debt: Affinity card advance purchase of mileage credits 80 75 71 66 PSP Promissory Note 66 53 66 52 Total debt $ 429 $ 410 $ 431 $ 412 The tables below present disclosures about the fair value of assets and liabilities measured at fair value on a recurring basis on the Company’s condensed consolidated balance sheets (in millions): Fair Value Measurements as of March 31, 2023 Description Balance Sheet Classification Total Level 1 Level 2 Level 3 Cash and cash equivalents Cash and cash equivalents $ 790 $ 790 $ — $ — Interest rate derivative contracts Other current assets $ 9 $ — $ 9 $ — Fair Value Measurements as of December 31, 2022 Description Balance Sheet Classification Total Level 1 Level 2 Level 3 Cash and cash equivalents Cash and cash equivalents $ 761 $ 761 $ — $ — Interest rate derivative contracts Other current assets $ 24 $ — $ 24 $ — The Company had no transfers of assets or liabilities between fair value hierarchy levels between December 31, 2022 and March 31, 2023.

Related Parties

Related Parties	3 Months Ended
	Mar. 31, 2023
Related Party Transactions [Abstract]
Related Parties	Related Parties Management Services Indigo Partners LLC (“Indigo Partners”) manages an investment fund that is the controlling stockholder of the Company. The Company is assessed a quarterly fee by Indigo Partners for management services. The Company recorded less than $1 million for each of the three months ended March 31, 2023 and 2022 for these fees, which are included as other operating expenses within the Company’s condensed consolidated statements of operations. Codeshare Arrangement The Company entered into a codeshare agreement with Controladora Vuela Compañía de Aviación, S.A.B. de C.V. (an airline based in Mexico doing business as “Volaris”) during 2018, under which sales began in July 2018. Two of the Company’s directors are members of the board of directors of Volaris and one is an alternate director. As of March 31, 2023, Indigo Partners holds approximately 18% of the total outstanding common stock of Volaris. In August 2018, the Company and Volaris began operating scheduled codeshare flights. The codeshare agreement provides for codeshare fees and revenue sharing for the codeshare flights. Each party bears its own costs and expenses of performance under the agreement, is required to indemnify the other party for certain claims and losses arising out of or related to the agreement and is responsible for complying with certain marketing and product display guidelines. The codeshare agreement also establishes a joint management committee, which includes representatives from both parties and generally oversees the management of the transactions and relationships contemplated by the agreement. The codeshare agreement is subject to automatic renewals and may be terminated by either party at any time upon the satisfaction of certain conditions.

The Proposed Merger with Spirit

The Proposed Merger with Spirit Airlines, Inc. (“Spirit”)	3 Months Ended
	Mar. 31, 2023
Business Combination and Asset Acquisition [Abstract]
The Proposed Merger with Spirit Airlines, Inc. (“Spirit”)	The Proposed Merger with Spirit Airlines, Inc. (“Spirit”) On February 5, 2022, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with Top Gun Acquisition Corp. (“Merger Sub”), a direct wholly-owned subsidiary of the Company, and Spirit. The Merger Agreement provided that, among other things, the Merger Sub would be merged with and into Spirit (the “Merger”), with Spirit surviving the Merger and continuing as a wholly-owned subsidiary of the Company. On July 27, 2022, the Company and Spirit mutually terminated the Merger Agreement. During the three months ended March 31, 2023, the Company recorded $1 million in expenses related to the proposed Merger within transaction and merger-related costs in the Company’s condensed consolidated statement of operations. These costs included $1 million of retention bonus expense, which represent merger-related retention costs for all eligible employees who were subject to CARES Act compensation restrictions. During the three months ended March 31, 2022, the Company recorded $11 million in expenses related to the proposed Merger within transaction and merger-related costs in the Company’s condensed consolidated statement of operations. These costs included $8 million in transaction costs, which are made up of banking, legal and accounting fees, among others, charged in connection with the merger and $3 million of retention bonus expense. In the event that Spirit, within twelve months following the termination of the Merger Agreement, consummates an acquisition with another acquiror or enters into a definitive written agreement providing for an acquisition with another acquiror, which is ultimately consummated, the Company will be owed an additional $69 million, as provided for in the Merger Agreement.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of PresentationThe condensed consolidated financial statements have been prepared in accordance with the generally accepted accounting principles in the United States (“GAAP”)
Consolidation, Policy	Basis of Presentation The condensed consolidated financial statements have been prepared in accordance with the generally accepted accounting principles in the United States (“GAAP”) and include the accounts of Frontier Group Holdings, Inc. (“FGHI” or the “Company”) and its wholly-owned direct and indirect subsidiaries, including Frontier Airlines Holdings, Inc. (“FAH”) and Frontier Airlines, Inc. (“Frontier”). All wholly-owned subsidiaries are consolidated, with all intercompany transactions and balances being eliminated.
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 reported amounts in the financial statements and accompanying notes. Actual results could differ from those estimates.
Frequent Flyer Program	Frequent Flyer Program The Company’s Frontier Miles frequent flyer program provides frequent flyer travel awards to program members based on accumulated mileage credits. Mileage credits are generally accumulated as a result of travel, purchases using the co-branded credit card and purchases from other participating partners. The Company defers revenue for mileage credits earned by passengers under its Frontier Miles program based on the equivalent ticket value a passenger receives by redeeming mileage credits for a ticket rather than paying cash. The Company has a credit card affinity agreement with its credit card partner, Barclays Bank Delaware (“Barclays”), through 2029, which provides for joint marketing, grants certain benefits to co-branded credit cardholders (“Cardholders”) and allows Barclays to market using the Company’s customer database. Cardholders earn mileage credits under the Frontier Miles
Operating Leases	The Company leases property and equipment under operating leases. For leases with initial terms greater than 12 months, the related operating lease right-of-use asset and corresponding operating lease liability are recorded at the present value of lease payments over the term on the Company’s condensed consolidated balance sheets. Some leases include rental escalation clauses, renewal options, termination options and/or other items that cause variability that are factored into the determination of lease payments, when appropriate. The Company does not separate lease and non-lease components of contracts, except for certain flight training equipment, for which consideration is allocated between lease and non-lease components.
Fair Value Measurement	Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes several valuation techniques in order to assess the fair value of its financial assets and liabilities. Cash, Cash Equivalents and Restricted Cash Cash, cash equivalents and restricted cash are comprised of liquid money market funds, time deposits and cash, and are categorized as Level 1 instruments. The Company maintains cash with various high-quality financial institutions and holds restricted cash to secure medical claims paid. Cash, cash equivalents and restricted cash are carried at cost, which management believes approximates fair value. As of March 31, 2023 and 2022, the Company had less than $1 million of restricted cash. Interest Rate Derivative Contracts Interest rate derivative contracts are valued under an income approach based on data either readily observable in public markets, derived from public markets or provided by counterparties who regularly trade in public markets and, therefore, they are classified as Level 2 inputs. Given the swaptions will be cash-settled upon exercise and that the market value will be determined using overnight indexed swap (“OIS”) discounting, OIS discounting is applied to the income approach valuation. Debt The estimated fair value of the Company’s debt agreements has been determined to be Level 3 measurement, as certain inputs used to determine the fair value of these agreements are unobservable. The Company utilizes a discounted cash flow method to estimate the fair value of the Level 3 debt.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	3 Months Ended
	Mar. 31, 2023
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Disaggregated operating revenues are as follows (in millions): Three Months Ended March 31, 2023 2022 Passenger revenues: Fare $ 303 $ 229 Non-fare passenger revenues: Baggage 221 130 Service fees 217 162 Seat selection 72 54 Other 17 13 Total non-fare passenger revenue 527 359 Total passenger revenues 830 588 Other revenues 18 17 Total operating revenues $ 848 $ 605
Revenue by Geographic Region	Operating revenues by principal geographic region, as defined by the U.S. Department of Transportation (the “DOT”), are as follows (in millions): Three Months Ended March 31, 2023 2022 Domestic $ 781 $ 546 Latin America 67 59 Total operating revenues $ 848 $ 605

Other Current Assets (Tables)

Other Current Assets (Tables)	3 Months Ended
	Mar. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	Other current assets consist of the following (in millions): March 31, 2023 December 31, 2022 Supplier incentives $ 53 $ 55 Prepaid expenses 27 20 Derivative instruments 9 24 Income tax and other taxes receivable 5 8 Other 5 7 Total other current assets $ 99 $ 114

Financial Derivative Instrume_2

Financial Derivative Instruments and Risk Management (Tables)	3 Months Ended
	Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)	The following table presents the net of tax impact of the overall effectiveness of derivative instruments designated as cash flow hedging instruments within the Company’s condensed consolidated statements of comprehensive income (loss) (in millions): Three Months Ended March 31, 2023 2022 Derivatives designated as cash flow hedges Interest rate derivative contract gains (losses), net of tax $ (7) $ —

Other Current Liabilities (Tabl

Other Current Liabilities (Tables)	3 Months Ended
	Mar. 31, 2023
Other Liabilities Disclosure [Abstract]
Schedule of Other Current Liabilities	Other current liabilities consist of the following (in millions): March 31, 2023 December 31, 2022 Passenger and other taxes and fees payable $ 138 $ 113 Salaries, wages and benefits 101 104 Aircraft maintenance 71 63 Station obligations 47 57 Fuel liabilities 31 34 Leased aircraft return costs 20 84 Other current liabilities 55 63 Total other current liabilities $ 463 $ 518

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2023
Debt Disclosure [Abstract]
Schedule of Debt Obligations	The Company’s debt obligations are as follows (in millions): March 31, 2023 December 31, 2022 Secured debt: Pre-delivery credit facility (a) $ 266 $ 277 Floating rate building note (b) 17 17 Unsecured debt: Affinity card advance purchase of mileage credits (c) 80 71 PSP Promissory Notes (d) 66 66 Total debt 429 431 Less current maturities of long-term debt (215) (157) Less debt acquisition costs and other discounts, net (2) (2) Long-term debt, net $ 212 $ 272 __________________ (a) The Company, through an affiliate, entered into the pre-delivery payment (“PDP”) facility with Citibank, N.A., as facility agent, in December 2014 (as amended, the “PDP Financing Facility”). The PDP Financing Facility is primarily collateralized by the Company’s purchase agreement for Airbus A320 family aircraft deliveries (see Note 9) through the term of the facility, which extends through December 2025. As of March 31, 2023, the PDP Financing Facility allows for total commitments up to $270 million. Interest is paid every 90 days based on the Secured Overnight Financing Rate ("SOFR") plus a margin for each individual tranche. The PDP Financing Facility consists of separate loans for each PDP aircraft. Each separate loan matures upon the earlier of (i) delivery of that aircraft to the Company by Airbus, (ii) the date one month following the last day of the scheduled delivery month of such aircraft and (iii) if there is a delay in delivery of aircraft, depending on the cause of the delivery delay, up to six months following the last day of the scheduled delivery month of such aircraft. The PDP Financing Facility will be repaid periodically according to the preceding sentence, with the last scheduled delivery of aircraft expected to be in the fourth quarter of 2025. (b) Represents a note with a commercial bank related to the Company’s headquarters building. Under the terms of the note, the Company began repaying the outstanding principal balance with quarterly payments beginning in January 2022 and continuing until the maturity date in December 2023. On the maturity date, one final balloon payment will be made to cover all unpaid principal, accrued unpaid interest and other amounts due. The interest rate of one-month London Interbank Offered Rate (“ LIBOR”) plus a margin is payable monthly. (c) The Company entered into an agreement with Barclays in 2003 which, as amended, provides for joint marketing, grants certain benefits to Cardholders and allows Barclays to market using the Company’s customer database, through 2029. Cardholders earn mileage credits under the Frontier Miles program and the Company sells mileage credits at agreed-upon rates to Barclays and earns fees from Barclays for the acquisition, retention and use of the co-branded credit card by Cardholders. In addition, Barclays will pre-purchase miles if the Company meets certain conditions precedent. The pre-purchased miles facility amount is to be reset on January 15 of each calendar year through, and including, January 15, 2028, based on the aggregate amount of fees payable by Barclays to the Company on a calendar year basis, up to an aggregate maximum facility amount of $200 million. The Company pays interest on a monthly basis, which is based on a one-month LIBOR plus a margin. Beginning March 31, 2028, the facility is scheduled to be repaid in 12 equal monthly installments. (d) As a result of the Company’s participation in the payroll support programs offered by the U.S. Department of the Treasury (the “Treasury”), the Company obtained a series of 10-year, low-interest loans from the Treasury (collectively, the “PSP Promissory Notes”) that are due between 2030 to 2031. The PSP Promissory Notes include an annual interest rate of 1.00% for the first five years and the SOFR plus 2.00% in the final five years, with bi-annual interest payments. The loans can be prepaid at par at any time without incurring a penalty. In connection with the term loan facility entered into with the Treasury on September 28, 2020 (the “Treasury Loan”), which was repaid in full on February 2, 2022, and the PSP Promissory Notes, the Company issued to the Treasury warrants to purchase 3,117,940 shares of FGHI common stock at a weighted-average price of $6.95 per share. The Treasury has not exercised any warrants as of March 31, 2023.
Schedule of Maturities of Long-term Debt	As of March 31, 2023, future maturities of debt are payable as follows (in millions): March 31, 2023 Remainder of 2023 $ 127 2024 147 2025 9 2026 — 2027 — Thereafter 146 Total debt principal payments $ 429

Operating Leases (Tables)

Operating Leases (Tables)	3 Months Ended
	Mar. 31, 2023
Leases [Abstract]
Schedule of Lease Costs	The table below presents certain information related to lease costs for operating leases during the three months ended March 31, 2023 and 2022 (in millions): Three Months Ended March 31, 2023 2022 Operating lease cost (a) $ 127 $ 117 Variable lease cost (a) 74 55 Total lease costs $ 201 $ 172 ______________ (a) Expenses are included within aircraft rent, station operations, maintenance, materials and repairs and other operating within the Company’s condensed consolidated statements of operations.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Long-term Purchase Commitment	As of March 31, 2023, the Company’s firm aircraft and engine purchase orders consisted of the following: A320neo A321neo (a) Total Aircraft (a) Engines Year Ending Remainder of 2023 — 10 10 3 2024 — 33 33 2 2025 17 13 30 4 2026 19 22 41 4 2027 21 21 42 3 Thereafter 10 52 62 2 Total 67 151 218 18 ______________ (a) The schedule presented reflects the contractual delivery dates as of March 31, 2023 and does not reflect the notification of aircraft delivery delays communicated by Airbus on May 3, 2023 which delays the Company’s scheduled A321neo deliveries between the second quarter of 2023 and fourth quarter of 2024. Pursuant to this notification received from Airbus, seven aircraft deliveries expected in 2023 shifted by an average of one month, resulting in two A321neo aircraft shifting from 2023 into 2024 and also shifting 11 A321neo aircraft from 2024 to 2025. Such delays in the scheduled deliveries of Airbus aircraft may persist in future periods.
Multiemployer Plan	The table below sets forth the Company’s employee groups and status of the collective bargaining agreements as of March 31, 2023: Percentage of Workforce Employee Group Representative Amendable Date (a) March 31, 2023 Pilots Air Line Pilots Association (ALPA) January 2024 31% Flight Attendants Association of Flight Attendants (AFA-CWA) May 2024 51% Aircraft Technicians International Brotherhood of Teamsters (IBT) May 2025 3% Aircraft Appearance Agents IBT October 2023 1% Dispatchers Transport Workers Union (TWU) December 2021 (b) 1% Material Specialists IBT March 2022 (b) <1% Maintenance Controllers IBT October 2023 <1% __________________ (a) Subject to standard early opener provisions. (b) The Company’s collective bargaining agreements with its dispatchers and material specialists, represented by TWU and IBT, respectively, were still amendable as of March 31, 2023 and negotiations are ongoing; however, each agreement is operating under its current arrangement until an amendment has been reached.

Net Earnings (Loss) per Share (

Net Earnings (Loss) per Share (Tables)	3 Months Ended
	Mar. 31, 2023
Earnings Per Share [Abstract]
Schedule Of Earnings Per Share Basic And Diluted	The following table sets forth the computation of net earnings (loss) per share on a basic and diluted basis pursuant to the two-class method for the periods indicated (in millions, except for share and per share amounts): Three Months Ended March 31, 2023 2022 Basic: Net income (loss) $ (13) $ (121) Less: net income attributable to participating rights — — Net income (loss) attributable to common stockholders $ (13) $ (121) Weighted-average common shares outstanding, basic 218,181,386 217,264,414 Net earnings (loss) per share, basic $ (0.06) $ (0.56) Diluted: Net income (loss) $ (13) $ (121) Less: net income attributable to participating rights — — Net income (loss) attributable to common stockholders $ (13) $ (121) Weighted-average common shares outstanding, basic 218,181,386 217,264,414 Effect of dilutive potential common shares — — Weighted-average common shares outstanding, diluted 218,181,386 217,264,414 Net earnings (loss) per share, diluted $ (0.06) $ (0.56)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments	The carrying amounts and estimated fair values of the Company’s debt are as follows (in millions): March 31, 2023 December 31, 2022 Carrying Estimated Fair Value Carrying Value Estimated Fair Value Secured debt: Pre-delivery credit facility $ 266 $ 265 $ 277 $ 277 Floating rate building note 17 17 17 17 Unsecured debt: Affinity card advance purchase of mileage credits 80 75 71 66 PSP Promissory Note 66 53 66 52 Total debt $ 429 $ 410 $ 431 $ 412
Schedule of Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis	The tables below present disclosures about the fair value of assets and liabilities measured at fair value on a recurring basis on the Company’s condensed consolidated balance sheets (in millions): Fair Value Measurements as of March 31, 2023 Description Balance Sheet Classification Total Level 1 Level 2 Level 3 Cash and cash equivalents Cash and cash equivalents $ 790 $ 790 $ — $ — Interest rate derivative contracts Other current assets $ 9 $ — $ 9 $ — Fair Value Measurements as of December 31, 2022 Description Balance Sheet Classification Total Level 1 Level 2 Level 3 Cash and cash equivalents Cash and cash equivalents $ 761 $ 761 $ — $ — Interest rate derivative contracts Other current assets $ 24 $ — $ 24 $ —

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2023 airport reportableSegment
Accounting Policies [Abstract]
Number of airports served | airport	100
Number of reportable segments | reportableSegment	1

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Capitalized Contract Cost [Line Items]
Air traffic liability balance	$ 430,000		$ 328,000
Air traffic liability recognized as passenger revenue	870,000%
Unearned travel club revenue	$ (76,000)		$ (60,000)
Passenger revenue recognized	$ 10,000	$ 22,000

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregated Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 848	$ 605
Total passenger revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	830	588
Fare
Disaggregation of Revenue [Line Items]
Total operating revenues	303	229
Total non-fare passenger revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	527	359
Baggage
Disaggregation of Revenue [Line Items]
Total operating revenues	221	130
Service fees
Disaggregation of Revenue [Line Items]
Total operating revenues	217	162
Seat selection
Disaggregation of Revenue [Line Items]
Total operating revenues	72	54
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	17	13
Other revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 18	$ 17

Revenue Recognition - Operating

Revenue Recognition - Operating Revenues by Principal Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 848	$ 605
Domestic
Disaggregation of Revenue [Line Items]
Total operating revenues	781	546
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 67	$ 59

Other Current Assets (Details)

Other Current Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Supplier incentives	$ 53	$ 55
Prepaid expenses	27	20
Derivative instruments	9	24
Income tax and other taxes receivable	5	8
Other	5	7
Total other current assets	$ 99	$ 114

Financial Derivative Instrume_3

Financial Derivative Instruments and Risk Management - Additional Information (Details)	3 Months Ended
	Mar. 31, 2023 USD ($) aircraft	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Derivative [Line Items]
Future engine deliveries with option to enter into and exercise cash settled swaps | aircraft	3
Interest Rate Swap
Derivative [Line Items]
Cost of swap	$ 0	$ 0
Notional amount	$ 451,000,000
Future aircraft deliveries with option to enter into and exercise cash settled swaps | aircraft	11
Amortization of cash flow hedges, net of tax, less than	$ 1,000,000	$ 1,000,000
Unrealized losses from cash flow hedges net of adjustment for dedesignation of fuel hedges, net of deferred tax benefit	13,000,000
Interest Rate Swap | Other Noncurrent Assets
Derivative [Line Items]
Derivative, other current assets	$ 9,000,000		$ 24,000,000

Financial Derivative Instrume_4

Financial Derivative Instruments and Risk Management - Net of Tax Impact of the Overall Effectiveness of Derivative Instruments Designated as Cash Flow Hedging Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) on interest rate derivative contracts	$ (7)	$ 0

Other Current Liabilities (Deta

Other Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Passenger and other taxes and fees payable	$ 138	$ 113
Salaries, wages and benefits	101	104
Aircraft maintenance	71	63
Station obligations	47	57
Fuel liabilities	31	34
Leased aircraft return costs	20	84
Other current liabilities	55	63
Total other current liabilities	$ 463	$ 518

Debt - Schedule of Debt Obligat

Debt - Schedule of Debt Obligations (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Apr. 30, 2020	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt, gross		$ 429	$ 431
Less current maturities of long-term debt		(215)	(157)
Less debt acquisition costs and other discounts, net		(2)	(2)
Long-term debt, net		$ 212	272
CARES Act Credit Agreement, Warrants
Debt Instrument [Line Items]
Warrants to acquire common stock (in shares)		3,117,940
Exercise price of warrants (in dollars per share)		$ 6.95
Warrants exercised (in shares)		0
Secured Debt | Pre-delivery credit facility
Debt Instrument [Line Items]
Long-term debt, gross		$ 266	277
Amount of unsecured borrowings available		$ 270
Periodic payment, interest, period		90 days
Secured Debt | Floating rate building note
Debt Instrument [Line Items]
Long-term debt, gross		$ 17	17
Unsecured Debt | PSP Promissory Note
Debt Instrument [Line Items]
Long-term debt, gross		$ 66	66
Interest rate		1%
Interest rate period		5 years
Unsecured Debt | PSP Promissory Note | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt instrument, variable interest rate		2%
Unsecured Debt | PSP1 Promissory Note
Debt Instrument [Line Items]
Loan term	10 years
Unsecured Debt | Affinity card advance purchase of mileage credits
Debt Instrument [Line Items]
Long-term debt, gross		$ 80	$ 71
Amount of unsecured borrowings available		$ 200

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Debt Disclosure [Abstract]
Interest paid	$ 6	$ 2

Debt - Schedule of Maturity (De

Debt - Schedule of Maturity (Details) $ in Millions	Mar. 31, 2023 USD ($)
Debt Disclosure [Abstract]
Remainder of 2023	$ 127
2024	147
2025	9
2026	0
2027	0
Thereafter	146
Total debt principal payments	$ 429

Operating Leases - Aircraft (De

Operating Leases - Aircraft (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) engine aircraft	Mar. 31, 2022 USD ($) aircraft engine
Lessee, Lease, Description [Line Items]
Gains recognized on sale-leaseback transactions | $	$ 40	$ 7
Aircraft
Lessee, Lease, Description [Line Items]
Number of leases | aircraft	125
Aircraft | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms	1 month
Aircraft | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms	12 years
Aircraft Engine
Lessee, Lease, Description [Line Items]
Number of leases | engine	30
Number of engines dependent on usage-based metrics | engine	12
Aircraft Engine | Aircraft Sale Leaseback
Lessee, Lease, Description [Line Items]
Number of sale-leaseback transactions | engine	1	1
Aircraft Engine | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms	1 month
Aircraft Engine | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms	12 years
Aircraft and Aircraft Engines
Lessee, Lease, Description [Line Items]
Gains recognized on sale-leaseback transactions | $	$ 40	$ 7
A320neo
Lessee, Lease, Description [Line Items]
Number of leases | aircraft	3
A320neo | Aircraft | Aircraft Sale Leaseback
Lessee, Lease, Description [Line Items]
Number of sale-leaseback transactions | aircraft	3	2

Operating Leases - Aircraft Ren

Operating Leases - Aircraft Rent Expense and Maintenance Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Leases [Abstract]
Aircraft rent expense (benefit)	$ 131	$ 128
Supplemental rent expense for maintenance-related reserves deemed non-recoverable	1	1
Supplemental rent expense related to probable lease return condition obligations	2	$ 15
Leased aircraft return cost liability	47		$ 102
Aircraft maintenance deposits expected to be recoverable	121		117
Aircraft maintenance deposits expected to be recoverable, eligible maintenance performed	36		12
Aircraft maintenance deposits	85		$ 105
Maintenance reserve payments, due remainder of fiscal year	2
Maintenance reserve payments, due in year one	3
Maintenance reserve payments, due in year two	3
Maintenance reserve payments, due in year three	3
Maintenance reserve payments, due in year four	5
Maintenance reserve payments, due after year four	$ 5

Operating Leases - Lease Extens

Operating Leases - Lease Extension (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Lessee, Lease, Description [Line Items]
Aircraft rent expense (benefit)	$ 131	$ 128
Aircraft
Lessee, Lease, Description [Line Items]
Aircraft rent expense (benefit)	$ (18)

Operating Leases - Airport Faci

Operating Leases - Airport Facilities (Details)	3 Months Ended
	Mar. 31, 2023 airport
Lessee, Lease, Description [Line Items]
Number of airports served	100
Minimum | Airport Facility
Lessee, Lease, Description [Line Items]
Remaining lease terms	1 month
Maximum | Airport Facility
Lessee, Lease, Description [Line Items]
Remaining lease terms	12 years

Operating Leases - Other Ground

Operating Leases - Other Ground Property and Equipment (Details) - Other Ground Property And Equipment	Mar. 31, 2023
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease terms	1 month
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease terms	9 years

Operating Leases - Lessor Conce

Operating Leases - Lessor Concessions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Lessee, Lease, Description [Line Items]
Increase (decrease) in deferrals related to leases	$ (1)	$ 0
Station Operations
Lessee, Lease, Description [Line Items]
Station deferrals to be recognized in station operations	$ 7

Operating Leases - Lease Cost (

Operating Leases - Lease Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease cost	$ 127	$ 117
Variable lease cost	74	55
Total lease costs	$ 201	$ 172

Operating Leases - Additional I

Operating Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Lessee, Lease, Description [Line Items]
Cash paid for amounts included in measurement of lease liabilities	$ 127	$ 117
Aircraft and Aircraft Engines
Lessee, Lease, Description [Line Items]
Acquired aircraft and engines through operating leases	$ 231	$ 61

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock-based compensation expense	$ 4	$ 3

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Options and Restricted Awards (Details)	3 Months Ended
	Mar. 31, 2023 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares) | shares	0
Stock option exercise (in shares) | shares	53,862
Weighted average stock price (in dollars per share) | $ / shares	$ 2.32
Weighted average exercise price of outstanding options (in dollars per share) | $ / shares	$ 1.96
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued (in shares) | shares	922,023
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 13.60
Vested (in shares) | shares	976,916
Shares withheld to cover employee taxes on vested restricted stock units (in shares) | shares	402,814
Weighted average grant date fair value, for vested shares (in dollars per share) | $ / shares	$ 12.27
Weighted average grant date fair value, withheld to cover employee taxes (in dollars per share) | $ / shares	$ 12.28

Stock-Based Compensation - Phan

Stock-Based Compensation - Phantom Equity Awards (Details) - Phantom Share Units (PSUs) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Current portion of phantom equity units		$ 26,000
Remaining liability paid	$ 26,000

Stock-Based Compensation - St_2

Stock-Based Compensation - Stockholders' Equity (Details) - $ / shares	Mar. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance (in shares)	750,000,000	750,000,000
Preferred stock authorized for issuance (in shares)	10,000,000	10,000,000
Common stock, stated par (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Nonvoting Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance (in shares)	150,000,000	150,000,000
Common stock, stated par (in dollars per share)	$ 0.001	$ 0.001

Commitments and Contingencies -

Commitments and Contingencies - Aircraft and Engine Orders (Details)		1 Months Ended		3 Months Ended
	May 03, 2023 aircraft	Nov. 30, 2021 aircraft	Dec. 31, 2017 aircraft	Mar. 31, 2023 aircraft engine
Air Transportation Equipment
Long-term Purchase Commitment [Line Items]
Remainder of 2023				10
2024				33
2025				30
2026				41
2027				42
Thereafter				62
Total				218
Aircraft Engine
Long-term Purchase Commitment [Line Items]
Remainder of 2023 | engine				3
2024 | engine				2
2025 | engine				4
2026 | engine				4
2027 | engine				3
Thereafter | engine				2
Total | engine				18
A320neo | Subsequent Event
Long-term Purchase Commitment [Line Items]
Number of aircraft experiencing delivery delays, shift from next fiscal year to current fiscal year	2
Number of aircraft experiencing delivery delays, shift from next fiscal year to two fiscal years	11
A320neo | Air Transportation Equipment
Long-term Purchase Commitment [Line Items]
Remainder of 2023				0
2024				0
2025				17
2026				19
2027				21
Thereafter				10
Total			67	67
A321neo | Subsequent Event
Long-term Purchase Commitment [Line Items]
Aircraft delivery delay, length of delay	1 month
Number of aircraft experiencing delivery delays, shift of less than one month	7
A321neo | Air Transportation Equipment
Long-term Purchase Commitment [Line Items]
Remainder of 2023				10
2024				33
2025				13
2026				22
2027				21
Thereafter				52
Total		91	60	151

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Details) $ in Millions	1 Months Ended		3 Months Ended
	Nov. 30, 2021 aircraft	Dec. 31, 2017 aircraft	Mar. 31, 2023 USD ($) aircraft engine leasingPartner employeeGroup	Dec. 31, 2022 USD ($)	Oct. 31, 2019 aircraft
Long-term Purchase Commitment [Line Items]
Purchase commitments for aircraft and engines, remainder of 2023			$ 589
Purchase commitments for aircraft and engines, 2024			1,974
Purchase commitments for aircraft and engines, 2025			1,767
Purchase commitments for aircraft and engines, 2026			2,358
Purchase commitments for aircraft and engines, 2027			2,448
Purchase commitments for aircraft and engines, thereafter			$ 3,759
Number of union-represented employee groups | employeeGroup			7
Amount of employees represented by unions			87%
Accrued liabilities for health care claims			$ 5	$ 5
Aircraft Engine
Long-term Purchase Commitment [Line Items]
Number of aircraft agreed to purchase | engine			18
Air Transportation Equipment
Long-term Purchase Commitment [Line Items]
Number of aircraft agreed to purchase | aircraft			218
Air Transportation Equipment | A320neo
Long-term Purchase Commitment [Line Items]
Number of aircraft agreed to purchase | aircraft		67	67
Number of aircraft eligible for conversion | aircraft					18
Air Transportation Equipment | A321neo
Long-term Purchase Commitment [Line Items]
Number of aircraft agreed to purchase | aircraft	91	60	151
Number of leasing partners with signed letter of intent | leasingPartner			2
Number of aircraft to be added through direct leases | aircraft			10

Commitments and Contingencies_3

Commitments and Contingencies - Collective Bargaining Agreements (Details)	3 Months Ended
	Mar. 31, 2023
Multiemployer Plan [Line Items]
Amount of employees represented by unions	87%
Pilots
Multiemployer Plan [Line Items]
Amount of employees represented by unions	31%
Flight Attendants
Multiemployer Plan [Line Items]
Amount of employees represented by unions	51%
Aircraft Technicians
Multiemployer Plan [Line Items]
Amount of employees represented by unions	3%
Aircraft Appearance Agents
Multiemployer Plan [Line Items]
Amount of employees represented by unions	1%
Dispatchers
Multiemployer Plan [Line Items]
Amount of employees represented by unions	1%
Material Specialists
Multiemployer Plan [Line Items]
Amount of employees represented by unions	1%
Maintenance Controllers
Multiemployer Plan [Line Items]
Amount of employees represented by unions	1%

Net Earnings (Loss) per Share_2

Net Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Basic:
Net income (loss)	$ (13,000)	$ (121,000)
Less: net income attributable to participating rights	0	0
Net income (loss) attributable to common stockholders	$ (13,000)	$ (121,000)
Weighted average common shares outstanding, basic (in shares)	218,181,386	217,264,414
Net earnings (loss) per share, basic (in dollars per share)	$ (0.06)	$ (0.56)
Diluted:
Less: net income attributable to participating rights	$ 0	$ 0
Net income (loss) attributable to common stockholders	$ (13,000)	$ (121,000)
Effect of dilutive potential common shares (in shares)	0	0
Weighted average common shares outstanding, diluted (in shares)	218,181,386	217,264,414
Net earnings (loss) per share, diluted (in dollars per share)	$ (0.06)	$ (0.56)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2023	Mar. 31, 2022
Fair Value Disclosures [Abstract]
Restricted cash	$ 1	$ 1

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Amounts and Estimated Fair Values of the Company’s Debt (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	$ 429	$ 431
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	410	412
Pre-delivery credit facility | Carrying Value | Secured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	266	277
Pre-delivery credit facility | Estimated Fair Value | Secured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	265	277
Floating rate building note | Carrying Value | Secured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	17	17
Floating rate building note | Estimated Fair Value | Secured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	17	17
Affinity card advance purchase of mileage credits | Carrying Value | Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	80	71
Affinity card advance purchase of mileage credits | Estimated Fair Value | Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	75	66
PSP Promissory Note | Carrying Value | Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	66	66
PSP Promissory Note | Estimated Fair Value | Unsecured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	$ 53	$ 52

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other current assets
Fair Value, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 790,000	$ 761,000
Interest rate derivative contracts	9,000	24,000
Fair Value, Recurring | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	790,000	761,000
Interest rate derivative contracts	0	0
Fair Value, Recurring | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Interest rate derivative contracts	9,000	24,000
Fair Value, Recurring | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Interest rate derivative contracts	$ 0	$ 0

Related Parties (Details)

Related Parties (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) aircraft	Mar. 31, 2022 USD ($)
Controladora Vuela Compañía de Aviación, S.A.B. de C.V. | Indigo Partners
Related Party Transaction [Line Items]
Outstanding shares of common stock held (as a percentage)	18%
Indigo Partners | Affiliated Entity
Related Party Transaction [Line Items]
Management fees, expense reimbursements, and director compensation | $	$ 1	$ 1
Controladora Vuela Compañía de Aviación, S.A.B. de C.V. | Affiliated Entity
Related Party Transaction [Line Items]
Number of company directors	2
Number of alternate company directors	1

The Proposed Merger with Spir_2

The Proposed Merger with Spirit Airlines, Inc. ("Spirit") (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Business Acquisition [Line Items]
Transaction and merger-related costs	$ 1	$ 11
Spirit Airlines, Inc Merger
Business Acquisition [Line Items]
Transaction and merger-related costs	1
Termination fee	69
Spirit Airlines, Inc Merger | Retention Bonus
Business Acquisition [Line Items]
Transaction and merger-related costs	$ 1	3
Spirit Airlines, Inc Merger | Legal, Accounting and Other Fees
Business Acquisition [Line Items]
Transaction and merger-related costs		$ 8