Frontier (ULCC) 10-K 22 Feb 23 2022 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 17, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
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
Trading Symbol	ULCC
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 348,000,000
Entity Common Stock, Shares Outstanding		218,059,843
Documents Incorporated by Reference	Portions of the registrant's definitive proxy statement relating to its 2023 Annual Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant's fiscal year ended December 31, 2022.
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Central Index Key	0001670076

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Audit Information [Abstract]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Denver, Colorado

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 761,000	$ 918,000
Accounts receivable, net	90,000	50,000
Supplies, net	55,000	29,000
Other current assets	114,000	40,000
Total current assets	1,020,000	1,037,000
Property and equipment, net	226,000	186,000
Operating lease right-of-use assets	2,484,000	2,426,000
Pre-delivery deposits for flight equipment	371,000	260,000
Aircraft maintenance deposits	105,000	98,000
Intangible assets, net	28,000	29,000
Other assets	265,000	199,000
Total assets	4,499,000	4,235,000
Liabilities and stockholders’ equity
Accounts payable	89,000	86,000
Air traffic liability	313,000	273,000
Frequent flyer liability	13,000	13,000
Current maturities of long-term debt, net	157,000	127,000
Current maturities of operating leases	465,000	444,000
Other current liabilities	518,000	383,000
Total current liabilities	1,555,000	1,326,000
Long-term debt, net	272,000	287,000
Long-term operating leases	2,034,000	1,991,000
Long-term frequent flyer liability	32,000	41,000
Other long-term liabilities	97,000	60,000
Total liabilities	3,990,000	3,705,000
Commitments and contingencies
Stockholders' equity
Common stock, $0.001 par value per share, with 217,875,890 and 217,065,096 shares issued and outstanding as of December 31, 2022 and 2021, respectively	0	0
Additional paid-in capital	393,000	381,000
Retained earnings	122,000	159,000
Accumulated other comprehensive income (loss)	(6,000)	(10,000)
Total stockholders’ equity	509,000	530,000
Total liabilities and stockholders’ equity	$ 4,499,000	$ 4,235,000

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical)	Dec. 31, 2021 $ / shares shares
Statement of Financial Position [Abstract]
Common stock, stated par (in dollars per share) | $ / shares	$ 0.001
Common stock, shares issued (in shares)	217,065,096
Common stock outstanding (in shares)	217,065,096

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating revenues:
Total operating revenues	$ 3,326,000	$ 2,060,000	$ 1,250,000
Operating expenses:
Aircraft fuel	1,160,000	575,000	338,000
Salaries, wages and benefits	715,000	616,000	533,000
Aircraft rent	556,000	530,000	396,000
Station operations	422,000	384,000	257,000
Sales and marketing	164,000	109,000	78,000
Maintenance, materials and repairs	146,000	119,000	83,000
Depreciation and amortization	45,000	38,000	33,000
CARES Act credits	0	(295,000)	(193,000)
Transaction and merger-related costs, net	10,000	0	0
Other operating	153,000	101,000	90,000
Total operating expenses	3,371,000	2,177,000	1,615,000
Operating income (loss)	(45,000)	(117,000)	(365,000)
Other income (expense):
Interest expense	(21,000)	(33,000)	(18,000)
Capitalized interest	11,000	4,000	6,000
Interest income and other	10,000	2,000	5,000
Total other income (expense)	0	(27,000)	(7,000)
Income (loss) before income taxes	(45,000)	(144,000)	(372,000)
Income tax expense (benefit)	(8,000)	(42,000)	(147,000)
Net income (loss)	$ (37,000)	$ (102,000)	$ (225,000)
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.17)	$ (0.48)	$ (1.13)
Diluted (in dollars per share)	$ (0.17)	$ (0.48)	$ (1.13)
Passenger
Operating revenues:
Total operating revenues	$ 3,248,000	$ 2,000,000	$ 1,207,000
Other
Operating revenues:
Total operating revenues	$ 78,000	$ 60,000	$ 43,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (37,000)	$ (102,000)	$ (225,000)
Other comprehensive loss
Unrealized gains (losses) and amortization from cash flow hedges net of adjustment for de-designation of fuel hedges, net of deferred tax benefit/(expense)	4,000	1,000	(15,000)
Other comprehensive income (loss)	4,000	1,000	(15,000)
Comprehensive income (loss)	$ (33,000)	$ (101,000)	$ (240,000)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ (37,000,000)	$ (102,000,000)	$ (225,000,000)
Deferred income taxes	(8,000,000)	(32,000,000)	(14,000,000)
Depreciation and amortization	45,000,000	38,000,000	33,000,000
Gains recognized on sale-leaseback transactions	(87,000,000)	(60,000,000)	(48,000,000)
Loss on extinguishment of debt	7,000,000	0	0
Warrant liability unrealized loss	0	22,000,000	9,000,000
Stock-based compensation	15,000,000	11,000,000	8,000,000
Amortization of cash flow hedges, net of tax	1,000,000	1,000,000	0
Cash flows from operating leases	0	0	17,000,000
Changes in operating assets and liabilities:
Accounts receivable	(28,000,000)	(14,000,000)	61,000,000
Supplies and other current assets	(40,000,000)	174,000,000	(170,000,000)
Aircraft maintenance deposits	(18,000,000)	(20,000,000)	(15,000,000)
Other long-term assets	(94,000,000)	(37,000,000)	(32,000,000)
Accounts payable	(4,000,000)	13,000,000	0
Air traffic liability	40,000,000	138,000,000	(114,000,000)
Other liabilities	130,000,000	84,000,000	(67,000,000)
Cash provided by (used in) operating activities	(78,000,000)	216,000,000	(557,000,000)
Cash flows from investing activities:
Capital expenditures	(41,000,000)	(27,000,000)	(16,000,000)
Pre-delivery deposits for flight equipment, net of refunds	(111,000,000)	(36,000,000)	28,000,000
Other	(2,000,000)	(4,000,000)	(1,000,000)
Cash provided by (used in) investing activities	(154,000,000)	(67,000,000)	11,000,000
Cash flows from financing activities:
Proceeds from issuance of debt, net of issuance costs	273,000,000	163,000,000	236,000,000
Principal repayments on debt	(266,000,000)	(97,000,000)	(126,000,000)
Proceeds from sale-leaseback transactions	71,000,000	59,000,000	47,000,000
Proceeds from initial public offering, net of offering costs, underwriting discounts and commissions	0	266,000,000	0
Proceeds from the exercise of stock options	1,000,000	3,000,000	0
Minimum tax withholdings on share-based awards	(4,000,000)	(3,000,000)	(1,000,000)
Cash provided by financing activities	75,000,000	391,000,000	156,000,000
Net increase (decrease) in cash, cash equivalents and restricted cash	(157,000,000)	540,000,000	(390,000,000)
Cash, cash equivalents and restricted cash, beginning of period	918,000,000	378,000,000	768,000,000
Cash, cash equivalents and restricted cash, end of period	$ 761,000,000	$ 918,000,000	$ 378,000,000

Consolidated Statements of Stoc

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, 2019		199,242,854
Beginning balance at Dec. 31, 2019	$ 542,000	$ 0	$ 52,000	$ 486,000	$ 4,000
Net income (loss)	(225,000)			(225,000)
Restricted stock issued (in shares)		99,408
Shares issued in connection with vesting of restricted stock units (in shares)		134,900
Shares withheld to cover employee taxes on vested restricted stock units (in shares)		(39,064)
Unrealized gain (loss) from cash flow hedges, net of tax	$ (15,000)				(15,000)
Stock option exercised (in shares)	0
Stock-based compensation	$ 8,000		8,000
Ending balance (in shares) at Dec. 31, 2020		199,438,098
Ending balance at Dec. 31, 2020	310,000	$ 0	60,000	261,000	(11,000)
Net income (loss)	(102,000)			(102,000)
Shares issued in connection with vesting of restricted stock units (in shares)		645,206
Shares withheld to cover employee taxes on vested restricted stock units (in shares)		(200,735)
Shares withheld to cover employee taxes on vested restricted stock units	(3,000)		(3,000)
Unrealized gain (loss) from cash flow hedges, net of tax	$ 1,000				1,000
Restricted stock unit repurchases (in shares)		(20,368)
Stock option exercised (in shares)	2,202,895	2,202,895
Stock option exercises	$ 3,000		3,000
Stock-based compensation	11,000		11,000
Issuance of common stock upon initial public offering, net of offering costs, underwriting discounts and commissions (in shares)		15,000,000
Issuance of common stock upon initial public offering, net of offering costs, underwriting discounts and commissions	267,000		267,000
CARES Act warrants	$ 43,000		43,000
Ending balance (in shares) at Dec. 31, 2021	217,065,096	217,065,096
Ending balance at Dec. 31, 2021	$ 530,000	$ 0	381,000	159,000	(10,000)
Net income (loss)	(37,000)			(37,000)
Shares issued in connection with vesting of restricted stock units (in shares)		845,606
Shares withheld to cover employee taxes on vested restricted stock units (in shares)		(312,541)
Shares withheld to cover employee taxes on vested restricted stock units	(4,000)		(4,000)
Unrealized gain (loss) from cash flow hedges, net of tax	4,000
Amortization of cash flow hedges, net of tax	1,000				1,000
Unrealized gain from cash flow hedges, net of tax	$ 3,000				3,000
Stock option exercised (in shares)	277,729	277,729
Stock option exercises	$ 1,000		1,000
Stock-based compensation	$ 15,000		15,000
Ending balance (in shares) at Dec. 31, 2022	217,875,890	217,875,890
Ending balance at Dec. 31, 2022	$ 509,000	$ 0	$ 393,000	$ 122,000	$ (6,000)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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)	$ 4

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The 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 primarily provides air transportation for passengers. Management has concluded there is only one reportable segment. A reclassification of previously reported amounts has been made to conform to the current year’s presentation in the Company’s consolidated statements of cash flows. The reclassification relates to the removal of cash flows for derivative instruments, net within the operating section and the reclassification of those cash outflows into supplies and other current assets within the changes in operating assets and liabilities section of the Company’s consolidated statements of cash flows. This reclassification did not impact previously reported amounts on the Company’s audited consolidated balance sheets, consolidated statements of operations, consolidated statements of comprehensive income (loss), or consolidated statements of stockholders’ equity and there was no impact to the total operating, investing or financing cash flows within the consolidated statements of cash flows. In addition, certain reclassifications of previously reported amounts have been made to conform to the current year presentation in Note 4. Other Current Assets, Note 13. Other Long-Term Liabilities and within the effective income tax rate table in Note 17. Income Taxes. These reclassifications did not impact previously reported amounts on the Company’s audited consolidated balance sheets, consolidated statements of operations, consolidated statements of comprehensive income (loss), consolidated statements of cash flows or consolidated statements of stockholders’ equity. 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. Initial Public Offering On March 31, 2021, the Company’s registration statement on Form S-1 relating to the Company’s initial public offering (“IPO”) was declared effective by the Securities and Exchange Commission (the “SEC”), and the Company’s common stock began trading on the NASDAQ Global Select Market on April 1, 2021 under the symbol “ULCC”. In April 2021, the Company received net proceeds of $266 million after deducting underwriting discounts and commissions of $14 million and offering costs of $5 million, which consisted of direct incremental legal, accounting, consulting and other fees relating to the IPO, and exclusive of any income tax benefits from the transaction. Cash and Cash Equivalents The Company considers all highly liquid investments with original maturities of three months or less at the date of acquisition to be cash and cash equivalents. Additionally, any items with maturities greater than three months that are readily convertible to known amounts of cash are considered cash and cash equivalents. Investments included in this category primarily consist of money market funds and time deposits. Restricted Cash Restricted cash may include certificates of deposit that secure letters of credit issued for particular airport authorities as required in certain lease agreements. The Company holds restricted cash to secure medical claims paid. Restricted cash may also include funds held as collateral for future travel paid with a credit card. These funds may be held by credit card processors directly under contracts that require a holdback of funds equal to a certain percentage of the related air traffic liability. If the Company fails to maintain certain liquidity and other financial covenants, the credit card processors’ rights to holdback would apply, which would result in a decrease of unrestricted cash. Restricted cash is carried at cost, which management believes approximates fair value. As of December 31, 2022 and 2021, the Company had less than $1 million of restricted cash. Accounts Receivable, net Receivables primarily consist of amounts due from credit card receivables, amounts due from select airport locations under revenue share agreements and amounts due from aircraft lessors for maintenance performed. The Company records an allowance for credit losses for amounts not expected to be collected. The Company estimates the allowance based on expected credit losses. The allowance for doubtful accounts was $4 million and $1 million as of December 31, 2022 and 2021, respectively. Supplies, net Supplies consist of expendable aircraft spare parts, aircraft fuel and other supplies and are stated at the lower of cost or net realizable value. Supplies are accounted for on a first-in, first-out basis and are charged to expense as they are used. An allowance for obsolescence on expendable aircraft spare parts is provided over the remaining lease term or the estimated useful life of the related aircraft fleet to reduce the carrying cost of spare parts currently identified as excess to the lower of amortized cost or net realizable value. The allowance for obsolescence was $8 million and $12 million as of December 31, 2022 and 2021, respectively. Property and Equipment, net Property and equipment are stated at cost and depreciated on a straight-line basis over their estimated useful lives to their estimated residual values. The Company capitalizes additions, modifications enhancing the operating performance of its assets and the interest related to payments used to acquire new aircraft and the construction of its facilities. The Company capitalizes interest attributable to pre-delivery deposit payments (“PDPs”) as an additional cost of the related asset beginning when activities necessary to get the asset ready for its intended use commence. Estimated useful lives and residual values for the Company’s property and equipment are as follows: Estimated Useful Life Residual Value Aircraft 25 years 10% Flight equipment leasehold improvements Lesser of lease term or economic life 0% Aircraft rotable parts Fleet life 10% Ground property and equipment 3 – 10 years 0% Ground equipment leasehold improvements Lesser of lease term or 10 years 0% Internal-use software 3 – 10 years 0% Capitalized maintenance Lesser of lease term or economic life 0% Buildings Lesser of 40 years or economic life 10% The components of depreciation and amortization expense are as follows (in millions): Year Ended December 31, 2022 2021 2020 Depreciation $ 44 $ 38 $ 32 Intangible amortization 1 — 1 Total depreciation and amortization $ 45 $ 38 $ 33 The Company capitalizes certain internal and external costs associated with the acquisition and development of internal-use software for new products and enhancements to existing products that have reached the application development stage and are deemed feasible. The Company depreciates these costs using the straight-line method over the estimated useful life of the software. Capitalized costs include external direct costs of materials and services utilized in developing or obtaining internal-use software, and labor cost for employees who are directly associated with, and devote time to, internal-use software projects. Capitalized computer software, net is included within ground and other equipment, which is a component of property and equipment, net on the accompanying consolidated balance sheets and totaled $10 million and $9 million as of December 31, 2022 and 2021, respectively. 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 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. When available, the rate implicit in the lease is used to discount lease payments to present value; however, most leases do not provide a readily determinable implicit rate. Therefore, the Company estimates its incremental borrowing rate (“IBR”) to discount the lease payments based on information available at lease commencement. The IBR utilized by the Company is first determined using an unsecured recourse borrowing rate over a tenor that matches the period of lease payments for each individual lease and then is adjusted to arrive at a rate that is representative of a collateralized rate (secured rate). Given the Company does not have an established unsecured public credit rating, the Company utilizes current period and projected financial information to simulate an unsecured credit rating. The Company then determines its secured IBR using a combination of several valuation methods that take into account the lower amount of risk of collateralized borrowings along with observable implied credit ratings from its current outstanding secured debt obligations. Asset Impairment The Company applies a fair value-based impairment test to the carrying amount of indefinite-lived intangible assets annually, or more frequently if certain events or circumstances indicate impairment. The Company assesses the value of indefinite-lived assets under a qualitative and quantitative approach, as required. Under a qualitative approach, the Company considers various market factors, including applicable key assumptions listed below. These factors are analyzed to determine if events and circumstances indicate that it is more likely than not that an indefinite-lived intangible asset's fair value is less than its carrying value. The quantitative approach is used to assess the asset’s fair value and the amount of the impairment. If the asset’s carrying amount exceeds its fair value calculated using the quantitative approach, an impairment charge is recorded for the difference in fair value and carrying amount. Indefinite-lived intangible assets are comprised of certain landing slot rights and the trademark of the Company. Factors that could result in future impairment of landing slot rights, holding other assumptions constant, include, but are not limited to: (i) significant reduction in demand for air travel, (ii) competitive activity in the slotted airport, (iii) anticipated changes to the regulatory environment such as diminished slot access and (iv) increased competition at a nearby airport. As part of this evaluation, the Company assesses whether changes in (i) macroeconomic conditions, (ii) industry and market conditions, (iii) cost factors, (iv) overall financial performance and (v) certain events specific to the Company, have occurred which would impact the use and/or fair value of these assets. As a result of the COVID-19 pandemic the Company performed a quantitative assessment on its indefinite-lived intangibles during 2020 and determined no impairment charges were necessary. As a result of the continued recovery during 2021 and 2022 and the substantial headroom between the book values and fair values of its indefinite-lived intangibles assets determined as part of the 2020 quantitative assessment, the Company performed qualitative assessments during 2022 and 2021, which resulted in no impairments. The Company records impairment charges on long-lived assets used in operations and finite-lived intangible assets when events and circumstances indicate that the assets may be impaired and the undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of those assets, and the net book value of the assets exceeds their estimated fair value. In making these determinations, the Company uses certain assumptions, including, but not limited to: (i) estimated fair value of the assets; and (ii) estimated undiscounted future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization including macroeconomic factors impacting future demand, length of service the asset will be used in the Company’s operations and estimated salvage values. There were no events or circumstances identified during 2022 that required the Company to perform a quantitative impairment assessment. Aircraft Maintenance The Company accounts for heavy maintenance and major overhauls under the deferral method, whereby the cost of heavy maintenance and major overhauls is deferred and recorded as flight equipment and depreciated over the lesser of the remaining lease term or the period until the next scheduled heavy maintenance event. The Company has separate maintenance cost-per-hour contracts for the repair of certain rotable parts to support airframe and engine maintenance and repair, as well as heavy maintenance and major overhauls. These agreements require monthly payments based upon utilization, such as flight hours, cycles and age of the aircraft. For the contracts in which risk has been determined to transfer to the service provider, expense is recognized based on the contractual terms of the cost-per-hour arrangement. For those contracts in which risk has not been determined to transfer to the service provider, the Company initially records monthly payments as a deposit included in other assets on the Company’s consolidated balance sheets and then accounts for the underlying maintenance event when it occurs, in accordance with the Company’s maintenance accounting policy. 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. At lease inception and at each balance sheet date, the Company assesses whether the maintenance reserve payments required by its leases are substantively and contractually related to the maintenance of the leased asset. Maintenance reserve payments that are determined to be related to the maintenance of the leased asset are accounted for as maintenance deposits, to the extent they are expected to be recoverable, and are reflected as aircraft maintenance deposits on the Company’s consolidated balance sheets. As the eligible maintenance is performed, the maintenance deposits are recorded in accounts receivable, net on the Company’s consolidated balance sheets. When it is not probable that the Company will recover amounts currently on deposit with a lessor, such amounts are expensed as supplemental rent within aircraft rent in the Company’s consolidated statements of operations. Maintenance reserve payments that are based on a utilization measure and are not probable of being recovered are considered variable lease payments and are not included within the right-of-use asset and respective lease liability. The Company makes certain assumptions at the inception of the lease and at each balance sheet date to determine the recoverability of maintenance deposits. These assumptions are based on various factors, such as the estimated time between the maintenance events, the cost of such maintenance events, the date the aircraft is due to be returned to the lessor and the number of flight hours and cycles the aircraft is estimated to be utilized before it is returned to the lessor. Changes in estimates are accounted for on a cumulative catch-up basis. On a regular basis, the Company assesses the credit worthiness of the Company’s lessors to ensure deposits are collectible and, specifically, whether any credit losses exist for aircraft maintenance deposits. Based on these assessments, the Company determined no allowance was necessary as of December 31, 2022 and 2021. Certain of the Company’s lease agreements provide that maintenance reserves held by the lessor at the expiration of the lease are nonrefundable to the Company and will be retained by the lessor. Consequently, any usage-based maintenance reserve payments after the last major maintenance event are not substantively related to the maintenance of the leased asset and, therefore, are accounted for as supplemental rent. Leased Aircraft Return Costs The Company’s aircraft lease agreements generally contain provisions that require the Company to return aircraft airframes and engines to the lessor in a specified condition or pay an amount to the lessor based on the airframe and engine’s actual return condition. Lease return costs include all costs that would be incurred at the return of the aircraft, including costs incurred to repair the airframe and engines to the condition required by the lease. Lease return costs could include, but are not limited to, redelivery cost, redelivery crew cost, fuel, final inspections, reconfiguration of the cabin, repairs to the airframe, painting, overhaul of engines, replacement of components and checks. These return provisions are evaluated at inception of the lease and throughout the lease terms and are accounted for as either fixed or variable lease payments (depending on the nature of the lease return condition) when it is probable that such amounts will be incurred. When determining probability and estimated cost, there are various other factors which need to be considered such as current condition of the aircraft, the age of the aircraft at lease expiration, number of hours run on the engines, number of cycles run on the airframe, projected number of hours run on the engine at the time of return, the projected number of cycles run on the airframe at the time of return, the extent of repairs needed, if any, upon return, return locations, current configuration of the aircraft, current paint of the aircraft, estimated escalation of cost of repairs and materials at the time of return, current flight hour agreement rates and future flight hour agreement rates. In addition, typically near the lease return date, the lessors may allow maintenance reserves to be applied as return condition consideration or pass on certain return provisions if they do not align with their current plans to remarket the aircraft. As a result of the different factors listed above, management assesses the need to accrue lease return costs throughout the lease as facts and circumstances warrant an assessment. When costs become both probable and estimable, lease return costs are expensed as a component of aircraft rent in the Company’s consolidated statements of operations through the remaining lease term. Derivative Instruments Fuel Hedging Activities Variability in jet fuel prices impacts the Company’s results of operations. In order to reduce the risk of exposure to fuel price increases, the Company may enter into derivative contracts such as swaps, call options and collars. Derivative instruments are stated at fair value, net of any collateral postings. The Company formally designates and accounts for the derivative instruments that meet established accounting criteria under ASC 815, Derivatives and Hedging , as cash flow hedges. For derivative instruments that are designated and qualify as cash flow hedges, the gain or loss on the derivative instruments is recorded in accumulated other comprehensive income/loss (“AOCI/L”), a component of stockholders’ equity on the Company’s consolidated balance sheets. The Company recognizes the associated gains or losses deferred in AOCI/L, as well as the amounts that are paid or received in connection with the purchase or sale of fuel-related financial derivative instruments (i.e., premium costs of option contracts), as a component of aircraft fuel expense within the Company’s consolidated statements of operations in the period that the aircraft fuel is consumed. For derivative instruments that are not designated as cash flow hedges, the gain or loss on the instrument is recognized in current period earnings. Cash flows related to fuel derivative instruments are classified as operating activities in the Company's consolidated statements of cash flows. The Company presents its fuel derivative instruments gross on its consolidated balance sheets. The Company does not enter into derivative instruments for speculative purposes. Refer to Note 7 for additional information regarding the Company’s hedge accounting and derivative instruments. Aircraft and Spare Engine Purchase Hedging Activities The Company is party to certain interest rate swaption agreements that are accounted for as cash flow hedges, as defined under ASC 815, Derivatives and Hedging . Some of the Company’s aircraft and spare engine sale-leaseback agreements can expose it to interest rate risk as, depending on the agreement, rental payments are adjusted and become fixed based on the swap rate at the time of delivery. The primary objective for interest rate derivatives is to hedge the portion of the estimated future monthly rental payments related to the associated agreement’s variable interest rate, primarily the Secured Overnight Financing Rate (“SOFR”). These swaption agreements provide for a single payment at maturity based upon the change in the applicable swap rate between the execution date and the termination date. For interest rate derivatives, the Company recognizes the associated gains or losses deferred in AOCI/L, as well as amounts that are paid or received in connection with the purchase or sale of interest rate derivative instruments (i.e., premium costs of swaption contracts), as a component of aircraft rent expense within the Company’s consolidated statements of operations over the period of the related aircraft lease. Cash flows related to interest rate swaption agreements are classified as operating activities in the Company’s consolidated statements of cash flows. The Company presents its interest rate swaption derivative instruments gross on the consolidated balance sheets. The Company does not enter into derivative instruments for speculative purposes. Refer to Note 7 for additional information regarding the Company’s hedge accounting and derivative instruments. Passenger Revenues Fare revenues. Tickets sold in advance of the flight date are initially recorded as an air traffic liability on the Company’s consolidated balance sheets. Fare revenues are recognized in passenger revenues within the Company’s consolidated statements of operations at the time of departure when transportation is provided. Non-fare passenger revenues. Certain ancillary items such as service fees, baggage and seat selection deemed part of providing passenger transportation are recognized to non-fare passenger revenues in passenger revenues within the Company’s consolidated statements of operations. Service fees include, among other things, convenience fees, charges for nonrefundable ticket expiration, cancellation charges and service charges assessed for itinerary changes made prior to the date of departure. Such change fees are recognized at the time of departure of the newly scheduled travel. Beginning in March 2020, resulting from the reduction in demand from the COVID-19 pandemic, the Company waived cancellation and change fees for customers for most of 2020 and the first quarter of 2021. Passenger Taxes and Fees. The Company is required to collect certain taxes and fees from customers on behalf of government agencies and airports and remit these back to the applicable governmental entity or airport on a periodic basis. These taxes and fees include U.S. federal transportation taxes, federal security charges, airport passenger facility charges, and foreign arrival and departure taxes. These taxes and fees are collected from customers at the time they purchase their tickets but are not included in passenger revenues. The Company records a liability within other current liabilities on the its consolidated balance sheets upon collection from the customer, and reduces the liability when payments are remitted to the applicable governmental agency or airport. Other Revenues Other revenues primarily consists of services not directly related to providing transportation, such as the advertising, marketing and brand elements of the Frontier Miles affinity credit card program and commissions revenue from the third-party sale of items such as rental cars and hotels. 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. Mileage credits are also sold to participating companies, including credit card companies and other third parties. Sales to credit card companies include multiple promised goods and services, which the Company evaluates to determine whether they represent performance obligations. The Company determined these arrangements have three separate performance obligations: (i) mileage credits to be awarded, (ii) licensing of brand and access to member lists and (iii) advertising and marketing efforts. Total arrangement consideration is allocated to each performance obligation on the basis of the deliverables relative standalone selling price. For mileage credits, the Company considers a number of entity-specific factors when developing the best estimate of the standalone selling price, including the number of mileage credits needed to redeem an award, average fare of comparable segments, breakage and restrictions. For licensing of brand and access to member lists, the Company considers both market-specific factors and entity-specific factors, including general profit margins realized in the marketplace and industry, brand power, market royalty rates and size of customer base. For the advertising and marketing performance obligation, the Company considers market-specific factors and entity-specific factors, including the Company’s internal costs of providing services, volume of marketing efforts and overall advertising plan. Consideration allocated based on the relative standalone selling price to both the brand licensing and access to member lists and advertising and marketing elements is recognized as other revenue in the Company’s consolidated statements of operations over time as mileage credits are delivered. The consideration allocated to the transportation portion of these mileage credit sales is deferred and recognized as a component of passenger revenue in the Company’s consolidated statements of operations at the time of travel for mileage credits redeemed. Mileage credits that the Company estimates are not likely to be redeemed are subject to breakage and are recognized as a portion of passenger revenues in the Company’s consolidated statements of operations in proportion to the pattern of rights exercised by customers. Management uses statistical modeling to estimate breakage based on historical redemption patterns. A change in assumptions as to the period over which mileage credits are expected to be redeemed, the actual redemption activity for mileage credits or the estimated fair value of mileage credits expected to be redeemed could have an impact on revenues in the year in which the change occurs and in future years. Redemptions are allocated between sold and flown mileage credits based on historical patterns. As a result of the reduction in demand due to the COVID-19 pandemic, beginning in March 2020, the Company extended the expiration dates of mileage credits issued under its frequent flyer program. Aircraft Fuel Aircraft fuel expense includes jet fuel and associated into-plane costs, federal and state taxes and the amortized gains, losses and premiums associated with effective fuel hedge contracts within AOCI/L and gains and losses from ineffective or de-designated fuel hedge contracts. Sales and Marketing Sales and marketing expense includes credit card processing fees, system booking fees, sponsorship and distribution costs such as the costs of the Company’s contact centers and advertising costs. Advertising and the related production costs are expensed as incurred, and for the years ended December 31, 2022, 2021 and 2020 represented $9 million, $7 million and $4 million, respectively, of sales and marketing expense reported within the Company’s consolidated statements of operations. Income Taxes The Company accounts for income taxes using the asset and liability method. Deferred income taxes are recognized for the tax consequences of temporary differences between the tax and financial statement reporting bases of assets and liabilities. The Company periodically assesses whether it is more likely than not that sufficient taxable income will be generated to realize deferred income tax assets, and a valuation allowance is established if it is not likely that deferred income tax assets will be realized. The Company considers sources of taxable income from prior period carryback periods, future reversals of existing taxable temporary differences, tax planning strategies and future projected taxable income when assessing the future realization of deferred tax assets. In assessing the sources of income and the need for a valuation allowance, the Company considers all available positive and negative evidence, which includes a recent history of cumulative losses. As of December 31, 2022 and 2021, the Company has an $8 million valuation allowance against its foreign and certain state net operating loss (“NOL”) deferred tax assets. Refer to Note 17 for additional information regarding the Company’s valuation allowance recorded as of December 31, 2022 and 2021. Stock-Based Compensation The Company recognizes cost of employee services received in exchange for awards of equity instruments based on the fair value of each instrument at the date of grant. Compensation expense is recognized over the period during which an employee is required to provide service in exchange for an award, with forfeitures accounted for as they occur. The fair value of stock option awards is estimated on the date of grant using the Black-Scholes valuation model. Restricted stock awards and restricted stock units are valued at the fair value of the shares on the date of grant. The exercise price of all stock awards is determined by the Company’s board of directors based, in part, on the ending stock price on the grant date. Prior to the Company’s IPO, there were significant judgments and estimates inherent in these valuations which included assumptions regarding the Company’s future operating performance, the time to complete potential liquidity events and the determinations of the appropriate valuation methods to be applied. Refer to Note 11 for additional disclosures regarding details of the Company’s stock-based compensation plans. Gains on Sale-Leaseback Transactions The Company enters into sale-leaseback transactions for its aircraft and aircraft engine assets, whereby the Company sells one or more aircraft or aircraft engine assets to a third-party and simultaneously enters into an operating lease for a right to use such assets for a fixed period of time. Gains on sale-leaseback transactions are recognized in the period in which title to the asset transfers to the buyer-lessor and the lease commences, as a component of other operating expenses within the Company’s consolidated statements of operations. Gains on sale-leaseback transactions are calculated as the excess of the sale price of the asset over its carrying value. The carrying value of the assets sold will generally include the price paid for the asset, net

Impact of COVID-19

Impact of COVID-19	12 Months Ended
	Dec. 31, 2022
Unusual or Infrequent Items, or Both [Abstract]
Impact of COVID-19	Impact of COVID-19 Impact of the COVID-19 Pandemic The COVID-19 pandemic, along with government-mandated restrictions on travel, required stay-in-place orders and other social distancing measures, had a material adverse effect on the Company’s business and results of operations for the years ended December 31, 2022, 2021 and 2020. Although the Company has continued to experience a significant and sustained recovery during the year ended December 31, 2022 as compared to the years ended December 31, 2021 and 2020, the Company is unable to predict the future spread and impact of COVID-19, including future variants of the virus and its subvariants, or the efficacy and adherence rates of vaccines and other therapeutics and the resulting measures that may be introduced by governments or other parties and what the overall impact may be to consumer behavior and the resulting demand for air travel. Widespread distribution of COVID-19 vaccines has led to increased confidence in travel, particularly in the domestic leisure market on which the Company’s business is focused. COVID-19 Relief Funding The Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) became law on March 27, 2020, and provided the airline industry with up to $25 billion for a Payroll Support Program (the “PSP”) to be used for employee wages, salaries and benefits and up to $25 billion in loans. During 2020 and 2021, the Company participated in the PSP, as well as the second Payroll Support Program (the “PSP2”) and the third Payroll Support Program (the “PSP3,” and, together with the PSP and the PSP2, the “PSPs”) offered by the U.S. Department of the Treasury (the “Treasury”), each of which included both a grant and an unsecured 10-year, low-interest promissory note. The grants were recognized within CARES Act credits in the Company’s consolidated statements of operations over the periods they were intended to support payroll. See Note 9 for further information on the promissory notes entered into with the Treasury as a result of participation in the payroll support programs (collectively, the “PSP Promissory Notes”). On April 30, 2020, the Company reached an agreement with the Treasury under which the Company received $211 million of installment funding comprised of a $178 million grant (the “PSP Grant”) for payroll support for the period from April 2020 through September 2020, and a $33 million unsecured 10-year, low-interest loan (the “PSP Promissory Note”), all of which was received during the year ended December 31, 2020. The PSP Grant was recognized over the period it was intended to support payroll. The Company recognized the full $178 million of PSP Grant proceeds, net of deferred financing costs of $1 million, during the year ended December 31, 2020, within CARES Act credits in the Company’s consolidated statements of operations. On September 28, 2020, the Company entered into a loan agreement with the Treasury for a term loan facility of up to $574 million pursuant to the secured loan program established under the CARES Act (the “Treasury Loan”). As of December 31, 2021, the Company had borrowed $150 million under the Treasury Loan, for which the right to draw any further funds lapsed in May 2021. On February 2, 2022, the Company repaid the Treasury Loan, which included the $150 million principal balance along with accrued interest and associated fees of $1 million. On January 15, 2021, pursuant to the Consolidated Appropriations Act, 2021, which extended the PSP provisions of the CARES Act, the Company entered into an agreement with the Treasury for installment funding under the PSP2, pursuant to which the Company received $161 million, comprised of a $143 million grant (the “PSP2 Grant”) for the continuation of payroll support from the date of the agreement through March 31, 2021, and an $18 million unsecured 10-year, low-interest loan (the “PSP2 Promissory Note”), all of which was received during the year ended December 31, 2021. The PSP2 Grant was recognized over the period it was intended to support payroll. The Company recognized the full $143 million of PSP2 Grant proceeds, net of deferred financing costs, during the year ended December 31, 2021, within CARES Act credits in the Company’s consolidated statements of operations. The American Rescue Plan Act (the “ARP”), enacted on March 11, 2021, provided for additional assistance to passenger air carriers that received financial relief under PSP2. On April 29, 2021, the Company entered into an agreement with the Treasury for installment funding under the PSP3, pursuant to which the Company received $150 million, comprised of a $135 million grant (the “PSP3 Grant”) for the continuation of payroll support through September 30, 2021, and a $15 million unsecured 10-year, low-interest loan (the “PSP3 Promissory Note”), all of which was received during the year ended December 31, 2021. The PSP3 Grant was recognized over the period it was intended to support payroll. The Company recognized the full $135 million of PSP3 Grant proceeds, net of deferred financing costs, during the year ended December 31, 2021, within CARES Act credits in the Company’s consolidated statements of operations. In connection with participation in the PSPs and the Treasury Loan, the Company has been subject to certain restrictions and limitations related to operations, use of grant funds, ability to terminate or furlough employees and executive compensation and dividends, of which the Company has been compliant with through December 31, 2022, as applicable. While most of the restriction periods have lapsed, as of December 31, 2022, the Company was still subject to restrictions on repurchases of equity securities listed on a national securities exchange and on payment of dividends until February 2, 2023, and remains subject to limits on certain executive compensation, including limiting pay increases and severance pay or other benefits upon terminations, until April 1, 2023 with additional required reporting and recordkeeping responsibilities. In connection with the PSP Promissory Notes and the Treasury Loan, 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 initial fair value of these warrants upon issuance was treated as a loan discount, which reduced the carrying value of the related Treasury Loan and PSP Promissory Notes, and is amortized utilizing the effective interest method as interest expense in the Company’s consolidated statements of operations over the term of each loan. These awards were originally classified as liability-based awards within other current liabilities on the Company’s consolidated balance sheets, with periodic mark to market remeasurements included in interest expense in the Company’s consolidated statements of operations given the Company only had the option of settling in cash prior to being publicly traded. As a result of the IPO, the Company has the intent and ability to settle the warrants issued to the Treasury in shares and, as a result, as of April 6, 2021, the Company reclassified the warrant liability to additional paid-in capital on the Company’s consolidated balance sheets and is no longer required to mark to market the warrants. The Company recorded no mark to market adjustments during the year ended December 31, 2022 and $22 million and $9 million in mark to market adjustments during the years ended December 31, 2021 and 2020, respectively, to interest expense within the Company’s consolidated statements of operations. The Treasury has not exercised any warrants as of December 31, 2022. The CARES Act also provided for an employee retention credit (the “CARES Employee Retention Credit”), which is a refundable tax credit against certain employment taxes that the Company qualified for beginning on April 1, 2020. In December 2020, the CARES Employee Retention Credit program was extended and enhanced through June 30, 2021. The ARP further extended the availability of the CARES Employee Retention Credit through December 31, 2021. As a result of the increase in revenues after the first quarter of 2021, the Company was no longer eligible for future credits due to the provisions of the gross receipt test applicable to this program. During the years ended December 31, 2021 and 2020, the Company recognized $17 million and $16 million, respectively, related to the CARES Employee Retention Credit within CARES Act credits in the Company’s consolidated statements of operations.

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition As of December 31, 2022 and 2021, the Company’s air traffic liability balance was $328 million and $273 million, respectively, including short-term and long-term liabilities. During the year ended December 31, 2022, substantially all of the air traffic liability as of December 31, 2021 has been recognized as passenger revenue within the Company’s consolidated statements of operations. Of the air traffic liability balances as of December 31, 2022 and 2021, $60 million and $11 million, respectively, was related to unearned membership fees, and $7 million and $59 million, respectively, was related to customer rights to book future travel, which either expire within 3 or 12 months after issuance if not redeemed by the customer. The amounts expected not to be redeemed are recognized over the historical pattern of rights exercised by customers to fare revenues in passenger revenues within the Company’s consolidated statements of operations. During the years ended December 31, 2022, 2021 and 2020, the Company recognized $82 million, $58 million and $126 million of revenue, respectively, in passenger revenues within the Company’s consolidated statements of operations, related to expected and actual expiration of customer rights to book future travel. Estimated and actual expiration of customer rights to book future travel during the year ended December 31, 2020 was mainly due to the large amount of modifications of travel initiated by customers during late March through June 30, 2020 as a result of the COVID-19 pandemic. 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 card holders and allows Barclays to market using the Company’s customer database. 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 consumers. 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): Year Ended December 31, 2022 2021 2020 Passenger revenues: Fare $ 1,382 $ 806 $ 548 Non-fare passenger revenues: Service fees 817 521 303 Baggage 741 457 229 Seat selection 251 170 84 Other 57 46 43 Total non-fare passenger revenue 1,866 1,194 659 Total passenger revenues 3,248 2,000 1,207 Other revenues 78 60 43 Total operating revenues $ 3,326 $ 2,060 $ 1,250 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): Year Ended December 31, 2022 2021 2020 Domestic $ 3,051 $ 1,950 $ 1,201 Latin America 275 110 49 Total operating revenues $ 3,326 $ 2,060 $ 1,250 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.

Other Current Assets

Other Current Assets	12 Months Ended
	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Current Assets	Other Current Assets Other current assets consist of the following (in millions): December 31, 2022 2021 Supplier incentives $ 55 $ 11 Derivative instruments 24 — Prepaid expenses 20 14 Income tax and other taxes receivable 8 12 Other 7 3 Total other current assets $ 114 $ 40

Property and Equipment, Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	Property and Equipment, Net The components of property and equipment, net are as follows (in millions): December 31, 2022 2021 Flight equipment $ 255 $ 212 Ground and other equipment 122 104 Less: accumulated depreciation (151) (130) Total property and equipment, net $ 226 $ 186 During the years ended December 31, 2022, 2021 and 2020 the Company deferred $40 million, $18 million and $9 million of costs for heavy maintenance, respectively.

Intangible Assets, net

Intangible Assets, net	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets, net	Intangible Assets, net The following table summarizes the Company’s intangible assets, net (in millions): December 31, 2022 2021 Amortization Gross Accumulated Net Carrying Amount Gross Accumulated Net Carrying Amount Indefinite-lived: Airport slots Indefinite $ 20 $ — $ 20 $ 20 $ — $ 20 Trademarks Indefinite 6 — 6 6 — 6 26 — 26 26 — 26 Finite-lived: Affinity credit card program 16 years 16 (14) 2 16 (13) 3 Total intangible assets, net $ 42 $ (14) $ 28 $ 42 $ (13) $ 29

Financial Derivative Instrument

Financial Derivative Instruments and Risk Management	12 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Derivative Instruments and Risk Management	Financial Derivative Instruments and Risk Management The Company is exposed to variability in jet fuel prices. Aircraft fuel is one of the Company’s largest operating expenses. Increases in jet fuel prices may adversely impact its financial performance, operating cash flow and financial position. As part of its risk management program, the Company may enter into derivative contracts in order to limit exposure to the fluctuations in jet fuel price s. There were no fuel hedges entered into during the years ended December 31, 2022 and 2021. The Company’s 2020 hedging program utilized call options and collar structures, which included both a purchased call option and sold put option. A lthough the use of collar structures can reduce the overall cost of hedging, these instruments carry more risk than purchased call options alone in that these instruments may result in a liability for the Company upon settlement. Additionally, 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 year ended December 31, 2022, the Company paid $19 million in upfront premiums for the option to enter into and exercise cash-settled swaps with a forward starting effective date. During the year ended December 31, 2021, the Company did not enter into any swaps and, therefore, paid no upfront premiums for options. During the year ended December 31, 2020, the Company paid $4 million in upfront premiums for options. As of December 31, 2022, the Company hedged the interest rate exposure on $573 million of total aircraft and spare engine rent for 14 aircraft and 4 engines, respectively, to be delivered by the end of 2023. In March 2020, the Company determined that it was no longer probable that estimated future fuel consumption for gallons subjected to fuel hedges would occur, primarily related to second quarter 2020 settled trades as the Company reduced scheduled flights as a result of the decline in customer demand from the COVID-19 pandemic, and, therefore, the Company was required to de-designate certain fuel hedges associated with estimated future consumption declines. The impacts of the de-designation in the Company’s results of operations are reflected in the tables below. 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. Based on the fair value of the Company’s fuel derivative instruments, the Company’s counterparties may require the Company to post collateral when the price of the underlying commodity decreases, and the Company may require its counterparties to provide collateral when the price of the underlying commodity increases. The amount of collateral posted, if any, is periodically adjusted based on the fair value of the hedge contracts. The Company’s policy is to offset the liabilities represented by these contracts with any cash collateral paid to the counterparties. 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 consolidated balance sheets. There were $24 million of assets outstanding as of December 31, 2022 and no assets outstanding as of December 31, 2021. The following table summarizes the effect of fuel and interest rate derivative instruments reflected in aircraft fuel and rent expense, respectively, within the Company’s consolidated statements of operations (in millions): Year Ended December 31, 2022 2021 2020 Derivatives designated as cash flow hedges Losses on fuel derivative contracts $ — $ — $ (26) Amortization of cash flow hedges $ (1) $ (1) $ (1) Derivatives not designated as cash flow hedges Losses on fuel derivative contracts $ — $ — $ (56) 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 consolidated statements of comprehensive income (loss) (in millions): Year Ended December 31, 2022 2021 2020 Derivatives designated as cash flow hedges Fuel derivative contract gains (losses), net of tax $ — $ — $ (16) Fuel derivative losses reclassified to earnings due to de-designation, net of tax — — 11 Interest rate derivative contract gains (losses), net of tax 3 — (10) Amortization of cash flow hedges, net of tax 1 1 — Total $ 4 $ 1 $ (15) As of December 31, 2022, $6 million is included in AOCI/L related to interest rate hedging instruments that is expected to be reclassified into aircraft rent within the Company’s consolidated statements of operations over the aircraft or engine lease term.

Other Current Liabilities

Other Current Liabilities	12 Months Ended
	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Other Current Liabilities	Other Current Liabilities Other current liabilities consist of the following (in millions): December 31, 2022 2021 Passenger and other taxes and fees payable $ 113 $ 84 Salaries, wages and benefits 104 89 Leased aircraft return costs 84 25 Aircraft maintenance 63 36 Station obligations 57 64 Fuel liabilities 34 23 Current portion of phantom equity units (Note 11) — 26 Other current liabilities 63 36 Total other current liabilities $ 518 $ 383 Other long-term liabilities consist of the following (in millions): December 31, 2022 2021 Deferred supplier incentives $ 43 $ 14 Leased aircraft return costs 18 24 Deferred revenue 18 21 Other 18 1 Total other long-term liabilities $ 97 $ 60

Debt

Debt	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Debt	Debt The Company’s debt obligations are as follows (in millions): December 31, 2022 2021 Secured debt: Pre-delivery credit facility (a) $ 277 $ 174 Floating rate building note (b) 17 18 Treasury Loan (c) — 150 Unsecured debt: Affinity card advance purchase of mileage credits (d) 71 15 PSP Promissory Notes (e) 66 66 Total debt 431 423 Less current maturities of long-term debt (157) (127) Less debt acquisition costs and other discounts, net (2) (9) Long-term debt, net $ 272 $ 287 __________________ (a) The Company, through an affiliate, entered into the 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 14) through the term of the facility, which extends through December 2025. As of December 31, 2022, the PDP Financing Facility allows for total commitments up to $290 million. Interest is paid every 90 days based on the 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 contemplated in the PDP Financing Facility, as currently in effect, 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 agreement, 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 LIBOR plus a margin is payable monthly. (c) On September 28, 2020, the Company entered into the Treasury Loan with the Treasury for a term loan facility of up to $574 million, and had borrowed $150 million under the loan as of December 31, 2021. On February 2, 2022, the Company repaid the Treasury Loan in full, along with accrued interest and associated fees of $1 million. Additionally, the Company recognized a $7 million loss on the extinguishment of debt for the year ended December 31, 2022 from the write-off of unamortized deferred financing costs associated with the Treasury Loan. The repayment terminated the loan agreement with the Treasury and substantially unencumbered the Company’s co-branded credit card program and related brand assets that secured the Treasury Loan. (d) The Company entered into an agreement with Barclays in 2003 which, as amended, provides for joint marketing, grants certain benefits to co-branded credit cardholders (“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. Per the terms of the Treasury Loan, the facility amount could not be extended above $15 million until full extinguishment of the Treasury Loan, which occurred in February 2022, and, as a result, the Company borrowed an additional $56 million in the first quarter of 2022. 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. (e) On April 30, 2020, the Company executed the PSP Promissory Note with the Treasury, pursuant to which the Company received a $33 million unsecured 10-year, low-interest loan. Subsequently, the Company entered into the PSP2 with the Treasury in January 2021 and the PSP3 with the Treasury in April 2021, from which the Company received an additional $18 million and $15 million, respectively, evidenced by the PSP2 Promissory Note and the PSP3 Promissory Note. 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. Cash payments for interest related to debt was $14 million, $9 million and $7 million for the years ended December 31, 2022, 2021 and 2020, 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 December 31, 2022 and 2021, the Company did not have any outstanding letters of credit that were drawn upon. As of December 31, 2022, future maturities of debt are payable as follows (in millions): December 31, 2022 2023 $ 157 2024 137 2025 — 2026 — 2027 — Thereafter 137 Total debt principal payments $ 431 The Company continues to monitor covenant compliance with various parties, including, but not limited to, its lenders and credit card processors, and as of the date of this report, the Company is in compliance with all of its covenants.

Operating Leases

Operating Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Operating Leases	Operating Leases Aircraft As of December 31, 2022, the Company leased 120 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 consolidated balance sheets. In addition, as of December 31, 2022, the Company leased 30 spare engines which are all under operating leases, with the remaining term ranging from 1 month to 12 years. As of December 31, 2022, 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 consolidated balance sheets as operating lease right-of-use assets or as operating lease liabilities. During the years ended December 31, 2022, 2021 and 2020, the Company executed sale-leaseback transactions with third-party lessors for 13, 13, and 9 new Airbus A320 family aircraft, respectively. Additionally, the Company completed sale-leaseback transactions for four engines, two engines and one engine during the years ended December 31, 2022, 2021 and 2020, respectively. 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 $87 million, $60 million and $48 million during the years ended December 31, 2022, 2021 and 2020, respectively, which are included as a component of other operating expenses within the Company’s consolidated statements of operations. In May 2021, the Company entered into an early termination and buyout agreement with one of its lessors for six aircraft previously owned by the Company. Of the four A319 aircraft originally scheduled to be returned in December 2021, two were returned during the second quarter of 2021 and two were returned during the third quarter of 2021, and the two A320ceo aircraft were returned as scheduled during the fourth quarter of 2021. The early returns of these aircraft retired the remaining A319 aircraft in the Company’s fleet. As a result of this early termination and buyout arrangement, the Company recorded a $10 million charge included as a component of aircraft rent within the Company’s consolidated statements of operations for the year ended December 31, 2021 related to the accelerated rent and lease return obligations of the A319 aircraft returned early. Aircraft Rent Expense and Maintenance Obligations During the years ended December 31, 2022, 2021 and 2020, aircraft rent expense was $556 million, $530 million and $396 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 $(1) million, $(3) million and $2 million for the years ended December 31, 2022, 2021 and 2020, respectively. The portion of supplemental rent expense related to probable lease return condition obligations was $90 million, $61 million and $25 million for the years ended December 31, 2022, 2021 and 2020, respectively. As of December 31, 2022 and 2021, our total leased aircraft return cost liability was $102 million and $49 million, respectively and are reflected in other current liabilities and other long-term liabilities within the Company’s 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 December 31, 2022 and 2021, the Company had aircraft maintenance deposits that are expected to be recoverable of $117 million and $108 million, respectively, on the Company’s consolidated balance sheets of which $12 million and $10 million, respectively, are included in accounts receivable, net on the Company’s consolidated balance sheets as the eligible maintenance has been performed. The remaining $105 million and $98 million are included within aircraft maintenance deposits on the Company’s consolidated balance sheets as of December 31, 2022 and 2021, 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 December 31, 2022, fixed maintenance reserve payments for aircraft and spare engines, including estimated amounts for contractual price escalations, were expected to be $3 million per year for the years 2023 through 2026, $4 million for 2027 and $5 million thereafter, before consideration of reimbursements. 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 December 31, 2022, the remaining lease terms vary from one month to ten 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 consolidated balance sheets as a 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 consolidated balance sheets as a right-of-use asset and liability. The remaining lease terms ranged from one month to nine years as of December 31, 2022. During June 2022, the Company entered into an agreement with an existing vendor that provides access and use of certain components and maintenance services, which modified the existing term by extending the agreement through 2031 and provided for more favorable pricing terms, including additional supplier credits to be recognized ratably over the term of the arrangement. As a result, the Company remeasured both its lease liability and right-of-use asset to reflect the extended terms and recorded a $22 million lease incentive in June of 2022. 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 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 consolidated statement of operations for the year ended December 31, 2022. The payback of station deferrals decreased operating cash flows and unfavorably impacted station operations within the Company’s results of operations by $3 million for the year ended December 31, 2022. The deferrals for the year ended December 31, 2021 decreased operating cash flows and unfavorably impacted the Company’s result of operations by $22 million, including a $31 million unfavorable impact to aircraft rent, partly offset by a $9 million favorable impact to station operations within the Company’s consolidated statement of operations. The deferrals for the year ended December 31, 2020 increased operating cash flows and favorably impacted the Company’s results of operations by $33 million, including a $31 million favorable impact to aircraft rent and a $2 million favorable impact to station operations within the Company’s consolidated statement of operations. As of December 31, 2022, the Company had $8 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 Position The table below presents the lease-related assets and liabilities recorded on the Company’s consolidated balance sheets as of December 31, 2022 and 2021 (in millions): December 31, Balance Sheet Classification 2022 2021 Assets Operating lease assets Operating lease right-of-use assets $ 2,484 $ 2,426 Liabilities Current Operating Current maturities of operating leases $ 465 $ 444 Long-term operating leases Operating Long-term operating leases 2,034 1,991 Total lease liabilities $ 2,499 $ 2,435 Weighted-average remaining lease term Operating leases 8 years 7 years Weighted-average discount rate Operating leases 5.39 % 5.08 % Lease Costs The table below presents certain information related to lease costs for operating leases during the years ended December 31, 2022, 2021 and 2020 (in millions): Year Ended December 31, 2022 2021 2020 Operating lease cost (a) $ 478 $ 454 $ 337 Variable lease cost (a) 219 284 220 Total lease costs $ 697 $ 738 $ 557 ______________ (a) Expenses are included within aircraft rent, station operations, maintenance, materials and repairs and other operating within the Company’s consolidated statements of operations. Undiscounted Cash Flows The table below reconciles the undiscounted cash flows as of December 31, 2022 (in millions) for each of the next five years and total of the remaining years to the operating lease liability recorded on the Company’s consolidated balance sheet: December 31, 2022 Operating Leases 2023 $ 478 2024 462 2025 447 2026 383 2027 317 Thereafter 1,005 Total undiscounted minimum lease rentals 3,092 Less: amount of lease payments representing interest (593) Present value of future minimum lease rentals 2,499 Less: current obligations under operating leases (465) Long-term operating lease obligations $ 2,034 During the years ended December 31, 2022 and 2021, the Company acquired, through new operating leases, operating lease assets totaling $405 million and $500 million, respectively, which are included in operating lease right-of-use assets on the Company’s consolidated balance sheets. During the years ended December 31, 2022, 2021 and 2020, the Company paid cash of $464 million, $461 million and $340 million net of lessor incentives received, respectively, for amounts included in the measurement of lease liabilities.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation During the years ended December 31, 2022, 2021 and 2020, the Company recognized $15 million, $11 million and $8 million , respectively, in stock-based compensation expense, which is included as a component of salaries, wages and benefits within the Company’s consolidated statements of operations. The stock-based compensation expense is related to stock options and restricted awards. The total income tax benefit recognized in the income statement for stock-based compensation expenses was $3 million, $2 million and $2 million, for the years ended December 31, 2022, 2021 and 2020, respectively. The Company also recognized additional income tax benefits of $1 million, $8 million and less than $1 million, for the years ended December 31, 2022, 2021 and 2020, respectively, for which options were exercised or restricted shares vested. Stock Options and Restricted Awards In April 2014, FGHI approved the 2014 Equity Incentive Plan (the “2014 Plan”). Under the terms of the 2014 Plan, 38 million shares of FGHI common stock were reserved for issuance. Concurrently with the Company’s IPO, on April 1, 2021 the Company approved the 2021 Incentive Award Plan (the “2021 Plan”), which reserved 7 million shares of FGHI common stock, as well as the 11 million issued awards from the 2014 Plan that were still outstanding plus any subsequently forfeited awards or awards that lapse unexercised after April 1, 2021, to be available for future issuances of stock-based compensation awards to be granted to members of the Board of Directors and certain employees and consultants. Additionally, shares available for issuance under the 2021 Plan will be subject to an annual increase on the first day of each fiscal year beginning in 2022 and ending in 2031, equal to the lesser of (i) one percent (1%) of the shares of stock outstanding on the last day of the immediately preceding fiscal year and (ii) such smaller number of shares of stock as determined by the Company’s Board of Directors; provided, however, that no more than 30 million shares of stock may be issued upon the exercise of incentive stock options. On January 1, 2022, 2,170,650 shares were added to the 2021 Plan as a result of the annual increase. As of December 31, 2022, there were 8 million shares available for issuance. Stock Options Stock option awards are granted with an exercise price equal to the fair market value of FGHI’s common stock on the date of grant, and generally vest evenly over four years of continuous service. Compensation expense related to stock options is recognized on a straight-line basis over the requisite service period, net of forfeitures, which are recognized on a specific-identification basis. A summary of stock option activity during the year ended December 31, 2022 is presented below: Number of Shares Weighted-Average Exercise Price Aggregate Grant Date Fair Value (in millions) Outstanding at January 1, 2022 7,651,407 $ 1.99 $ 8 Issued — — — Exercised (277,729) $ 2.69 (1) Forfeited — — — Outstanding at December 31, 2022 7,373,678 $ 1.96 $ 7 Exercisable at December 31, 2022 7,346,601 $ 1.93 $ 7 There were no options granted during the years ended December 31, 2022, 2021, and 2020. During the years ended December 31, 2022 and 2021, 277,729 and 2,202,895 vested stock options were exercised, respectively, with an intrinsic value of $3 million and $32 million, respectively; and there were no exercises during the year ended December 31, 2020. As of December 31, 2022, the aggregate intrinsic value of outstanding options was $61 million. As of December 31, 2022, there was less than $1 million of unrecognized compensation cost related to unvested stock options which is expected to be recognized over a weighted-average period of 0.7 years. Additionally, as of December 31, 2022, exercisable options and outstanding options both have a remaining weighted-average contractual term of 2.2 years. Restricted Awards Restricted stock awards and restricted stock units in FGHI (collectively, “Restricted Awards”) are valued at the fair value of FGHI’s common stock on the date of grant. Restricted stock awards generally vest on the one-year anniversary from the date of issuance based upon time-based service conditions. Each restricted stock unit represents the right to receive one share of common stock upon vesting of such restricted stock unit. Vesting of restricted stock units is based on time-based service conditions, approximately one year of continuous service for the Company’s Board of Directors and three A summary of Restricted Award activity during the years ended December 31, 2022, 2021 and 2020 is presented below: 2022 2021 2020 Number of Shares Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Grant Date Fair Value Outstanding at January 1 1,970,294 $ 12.47 2,020,650 $ 10.54 368,714 $ 12.17 Issued 1,344,532 $ 11.96 899,800 $ 14.70 1,869,372 $ 10.39 Vested (533,065) $ 12.48 (543,879) $ 10.23 (151,430) $ 12.22 Forfeited (73,711) $ 11.98 (205,542) $ 10.62 (26,942) $ 11.05 Repurchased (a) (312,541) $ 12.14 (200,735) $ 11.00 (39,064) $ 11.82 Outstanding at December 31 2,395,509 $ 12.24 1,970,294 $ 12.47 2,020,650 $ 10.54 __________________ (a) Represents withholdings to cover tax obligations on vested shares when applicable The total fair value of restricted awards vested was $10 million, $11 million and $2 million, during the years ended December 31, 2022, 2021 and 2020, respectively. As of December 31, 2022, there was $18 million of unrecognized compensation cost related to unvested Restricted Awards which is expected to be recognized over a weighted-average period of 2.1 years. Liability-Classified Awards

Employee Retirement Plans

Employee Retirement Plans	12 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Employee Retirement Plans	Employee Retirement Plans The Company recorded $56 million, $46 million and $37 million in expense related to matching contributions to employee retirement plans for the years ended December 31, 2022, 2021 and 2020, respectively. This is recorded as a component of salaries, wages and benefits in the Company’s consolidated statements of operations. Frontier 401(k) Plan The Company sponsors The Frontier Airlines, Inc. 401(k) Retirement Plan (the “Frontier 401(k) Plan”) under Section 401(k) of the Internal Revenue Code. This plan excludes pilots, who are covered under a separate plan discussed below. Under the Frontier 401(k) Plan, the Company matches 50% of each eligible participant’s contribution, up to 2% of their compensation for maintenance employees and up to 6% of their compensation for all other employees, excluding flight attendants, whose contributions are matched at 100% of up to 6% of their compensation. Effective February 2022, contributions for employees begin after 60 days of employment (previously one year) and vest 25% per year over four years. Participants are entitled to receive distributions of all vested amounts beginning at age 59 1/2. The plan is subject to the annual IRS elective deferral limit of $20,500 for 2022 and $19,500 for 2021 and 2020. FAPA Plan The Company also established the Frontier Airlines, Inc. Pilots Retirement Plan (the “FAPA Plan”), a defined contribution retirement plan for pilots covered under the collective bargaining agreement with the Frontier Airlines Pilots Association (“FAPA”). Effective September 1, 2016, pilots are no longer represented by FAPA and are represented by the Air Line Pilots Association (“ALPA”), however the FAPA Plan remained in effect under the collective bargaining agreement with ALPA. Under the latest collective bargaining agreement with the pilots, effective as of January 2019 for a five year period, the Company match no longer occurs under this plan, and instead, the Company makes nonelective contributions on behalf of each eligible pilot equal to a percentage of the pilot’s compensation, ranging from 12% to 15% over the term of the collective bargaining agreement (see Note 14). The nonelective contributions are subject to vesting based on years of service. Participants are entitled to receive distributions of all vested amounts beginning at age 59 1/2. The plan is subject to the annual IRS elective deferral limit of $20,500 for 2022 and $19,500 for 2021 and 2020.

Other Long-Term Liabilities

Other Long-Term Liabilities	12 Months Ended
	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Other Long-Term Liabilities	Other Current Liabilities Other current liabilities consist of the following (in millions): December 31, 2022 2021 Passenger and other taxes and fees payable $ 113 $ 84 Salaries, wages and benefits 104 89 Leased aircraft return costs 84 25 Aircraft maintenance 63 36 Station obligations 57 64 Fuel liabilities 34 23 Current portion of phantom equity units (Note 11) — 26 Other current liabilities 63 36 Total other current liabilities $ 518 $ 383 Other long-term liabilities consist of the following (in millions): December 31, 2022 2021 Deferred supplier incentives $ 43 $ 14 Leased aircraft return costs 18 24 Deferred revenue 18 21 Other 18 1 Total other long-term liabilities $ 97 $ 60

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Flight Equipment Commitments As of December 31, 2022, the Company’s firm aircraft and engine orders consisted of the following: A320neo A321neo Total Engines Year Ending 2023 — 13 13 4 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 67 154 221 19 As of December 31, 2022, 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 63 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. Eac h 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 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 amendmen t with Airbus to add an additional 91 A321neo aircraft (“supplemental aircraft”) to the committed purchase agreement, with deliveries expected to begin in 2024, 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 December 31, 2022, purchase commitments for these aircraft and engines, including estim ated amounts for contractual price escalations and PDPs, were approximately $760 million in 2023, $1,974 million in 2024, $1,767 million in 2025, $2,358 million in 2026, $2,448 million in 2027 and $3,758 million thereafter. As of December 31, 2022, the Company had signed lease agreements with two of its leasing partners to add ten additional A321neo aircraft through direct leases, with deliveries beginning in the first quarter of 2023 and 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 committed purchase agreements. Litigation and Other Contingencies On March 12, 2021, the DOT advised the Company that it was in receipt of information indicating that the Company had failed to comply with certain DOT consumer protection requirements relating to consumer refund and credit practices and requested that the Company provide certain information to the DOT. The original DOT request for information and subsequent correspondence and requests were focused on the Company’s refund practices on Company initiated flight cancellations and/or significant schedule changes in flights as a result of the COVID-19 pandemic. The Company fully cooperated with the DOT request. During November 2022, the Company reached a settlement with the DOT that required the Company to offer refunds to any impacted passengers who did not use a provided flight credit or were not provided other travel accommodations and/or incentives in connection with Frontier-initiated flight cancellations and/or significant schedule changes. The Company was also required to provide short duration flight credits for certain customers who were unable to redeem their flight credits during a period in 2020 due to technological issues as well as pay a net cash penalty of $1 million. The impact of the settlement for amounts in excess of reserves previously established for this matter for the year ended December 31, 2022 was not material. 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 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 represent approximately 87% of all employees as of December 31, 2022. The table below sets forth the Company’s employee groups and status of the collective bargaining agreements as of December 31, 2022: Percentage of Workforce Employee Group Representative Amendable Date December 31, 2022 Pilots Air Line Pilots Association (ALPA) January 2024 31% Flight Attendants Association of Flight Attendants (AFA-CWA) May 2024 52% Aircraft Technicians International Brotherhood of Teamsters (IBT) May 2025 (a) 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) The Company conducted off-cycle negotiations in May 2022 with its aircraft technicians, represented by IBT, where the amendable date was extended from March 2024 to May 2025. (b) The Company’s collective bargaining agreements with its dispatchers and material specialists, represented by TWU and IBT, respectively, were still amendable as of December 31, 2022 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 has accrued $5 million for health care claims estimated to be incurred but not yet paid as of December 31, 2022 and 2021, which is included as a component of other current liabilities on the Company’s 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 us, 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.

Stockholders_ Equity

Stockholders’ Equity	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Stockholders’ Equity	Stockholders’ Equity As of December 31, 2022 and 2021, the Company has 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. The Company had 217,875,890 and 217,065,096 shares of common stock outstanding as of December 31, 2022 and 2021, respectively. All of the Company’s issued and outstanding shares of common stock are duly authorized, validly issued, fully paid and nonassessable. Each holder of the Company’s common stock is entitled to one vote for each share on all matters submitted to a vote of the stockholders, including the election of directors. Holders of the Company’s common stock have no preemptive, subscription or other rights, and no redemption or sinking fund provisions applicable to the Company’s common stock exist. During each of the years ended December 31, 2022, 2021 and 2020, no dividends were declared and the Company paid less than $1 million in distributions to those with other participating rights. As of December 31, 2022 there were no dividends payable outstanding. As of December 31, 2021, less than $1 million was payable to those with other participating rights, which was included in other current liabilities on the Company’s consolidated balance sheets.

Net Earnings (Loss) per Share

Net Earnings (Loss) per Share	12 Months Ended
	Dec. 31, 2022
Earnings Per Share [Abstract]
Net Earnings (Loss) per Share	Net Earnings (Loss) per Share Basic 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 data): Year Ended December 31, 2022 2021 2020 Basic: Net income (loss) $ (37) $ (102) $ (225) Less: net income attributable to participating rights — — — Net income (loss) attributable to common stockholders $ (37) $ (102) $ (225) Weighted-average common shares outstanding, basic 217,601,373 211,436,542 199,260,410 Net earnings (loss) per share, basic $ (0.17) $ (0.48) $ (1.13) Diluted: Net income (loss) $ (37) $ (102) $ (225) Less: net income attributable to participating rights — — — Net income (loss) attributable to common stockholders $ (37) $ (102) $ (225) Weighted-average common shares outstanding, basic 217,601,373 211,436,542 199,260,410 Effect of dilutive potential common shares — — — Weighted-average common shares outstanding, diluted 217,601,373 211,436,542 199,260,410 Net earnings (loss) per share, diluted $ (0.17) $ (0.48) $ (1.13) Due to the net loss for the years ended December 31, 2022, 2021 and 2020, diluted weighted-average shares outstanding are equal to basic weighted-average shares outstanding because the effect of all equity awards is anti-dilutive.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of income tax expense are as follows (in millions): Year Ended December 31, 2022 2021 2020 Current: Federal $ — $ (10) $ (134) State and local — — 1 Current income tax expense (benefit) — (10) (133) Deferred: Federal (7) (32) (5) State and local (1) (1) (9) Foreign — 1 — Deferred income tax expense (benefit) (8) (32) (14) Total income tax expense (benefit) $ (8) $ (42) $ (147) The income tax provision differs from that computed at the federal statutory corporate tax rate as follows: Year Ended December 31, 2022 2021 2020 U.S. federal statutory income tax rate 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit 1.7 1.6 2.1 Excess tax benefits of stock-based compensation 1.2 5.2 — Reserves for uncertain tax positions, net 0.6 6.2 (0.2) Nondeductible warrants — (3.5) (0.5) Impact of the CARES Act — — 16.9 Executive compensation limitation (3.9) (0.5) — Return to provision adjustment (2.9) — — Other 0.1 (0.8) 0.2 Effective income tax rate 17.8 % 29.2 % 39.5 % The effective tax rate for the year ended December 31, 2022 is lower than the statutory rate, primarily due to limitations on compensation provided to certain executives pursuant to Internal Revenue Code section 162(m) and return to provision adjustments, partly offset by state taxes, net of federal benefit and excess tax benefits of stock-based compensation. The effective tax rate for the year ended December 31, 2021 was greater than the statutory rate, primarily attributable to the release of the reserves related to uncertain tax positions for which the statute of limitations has expired and excess tax benefits associated with the Company’s stock-based compensation arrangements, partly offset by non-deductible interest from the mark to market adjustments from the warrants issued to the Treasury as part of the Company’s participation in the PSPs and the Treasury Loan. The CARES Act permits an NOL generated in 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid income taxes. As a result, the Company’s taxable losses for 2020 were fully absorbed in the 2015 and 2016 tax years (pre-Tax Cuts and Jobs Act) in which a federal 35% tax rate applies, resulting in a permanent benefit of the 14% rate differential which was favorably impacted by the inclusion of the tax deduction for the payments made to FAPAInvest, LLC, as described in Note 11. The Company had net tax payments/(refunds) of less than $1 million, $(158) million and $9 million for the years ended December 31, 2022, 2021 and 2020, respectively. Deferred income taxes reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial statement and income tax purposes. The following table shows the components of the Company’s deferred tax assets and liabilities (in millions): December 31, 2022 2021 Deferred tax assets: Operating lease liability $ 568 $ 551 Net operating losses 50 47 Nondeductible accruals 42 32 Deferred revenue 14 12 Income tax credits 1 2 Valuation allowance (8) (8) Other 10 10 Deferred tax assets $ 677 $ 646 Deferred tax liabilities: Right-of-use asset $ (559) $ (545) Property and equipment (41) (36) Maintenance deposits (24) (22) Intangibles (6) (6) Other (14) (12) Deferred tax liabilities (644) (621) Net deferred tax assets (liabilities) $ 33 $ 25 As of December 31, 2022, the Company’s net deferred tax asset balance was $33 million, and was classified within other assets on the Company’s consolidated balance sheet. This balance included $50 million of deferred tax assets related to NOL carry forwards which are made up of $32 million of federal NOLs, which do not expire, $11 million of state NOLs, which expire from one year to having no expiration, and $7 million of foreign NOLs, which expire in eight years. The Company recognizes a valuation allowance when it is more likely than not that some portion, or all, of the Company’s deferred tax assets, will not be realized. The Company considers sources of taxable income from prior period carryback periods, future reversals of existing taxable temporary differences, tax planning strategies and future taxable income when assessing the future utilization of deferred tax assets. The Company considers all available positive and negative evidence in determining the need for a valuation allowance. The Company updated this assessment as of December 31, 2022, noting that in part as a result of the significant impacts from the COVID-19 pandemic, the Company was in a cumulative three-year loss position. Prior to the pandemic, the Company has a consistent history of generating significant earnings and resulting taxable income and has typically utilized significant deferred tax assets such as NOLs prior to expiration. The main source of taxable income that supports realization of the Company’s deferred tax assets was from the Company’s projected future taxable income. The Company expects to generate significant positive earnings in the near term as the recovery from the pandemic is expected to continue which would support the realization of substantially all of the Company’s federal and state deferred tax assets. As a result of the assessment as of December 31, 2022, the Company maintained its valuation allowance related to its $7 million of foreign deferred tax assets and certain state deferred tax assets of $1 million, as these will most likely not be realized, given the short expiry periods in foreign and certain state jurisdictions. The following table shows the components of the Company’s unrecognized tax benefits related to uncertain tax positions (in millions): 2022 2021 2020 Unrecognized tax benefits at January 1 $ 1 $ 10 $ 9 Decrease for tax positions taken during prior period — (9) — Increase for tax positions taken during current period — — 1 Unrecognized tax benefits at December 31 $ 1 $ 1 $ 10 In December of 2021, the Company received its federal tax refund related to the Company carrying back its 2020 losses to previous year’s tax returns that included certain unrecognized tax positions. Upon receipt of the 2020 tax year refund, the previous year’s tax returns effectively are considered closed and, as the statute of limitations reverted back at that time to its original expiry, the Company released any reserve related to tax periods where the statute of limitations would have lapsed. It is reasonably possible that the amount of unrecognized tax benefit could change within the next 12 months pending the outcome of any cases currently in litigation or a lapse in the statute of limitations. The total amount of unrecognized benefit, if recognized, would reduce income tax expense by $1 million. The Company accrues interest related to unrecognized tax benefits in its provision for income taxes, and any associated penalties in other operating expenses. The amounts recorded in the Company’s consolidated financial statements related to interest and penalties was less than $1 million for each of the years ended December 31, 2022, 2021 and 2020.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2022
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 December 31, 2022 and 2021, 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 done 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): December 31, 2022 December 31, 2021 Carrying Estimated Fair Value Carrying Value Estimated Fair Value Secured debt: Pre-delivery credit facility $ 277 $ 277 $ 174 $ 175 Floating rate building note 17 17 18 19 Treasury Loan — — 150 156 Unsecured debt: Affinity card advance purchase of mileage credits 71 66 15 14 PSP Promissory Note 66 52 66 58 Total debt $ 431 $ 412 $ 423 $ 422 The tables below present disclosures about the fair value of assets and liabilities measured at fair value on a recurring basis in the Company’s consolidated financial statements (in millions): 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 $ — Fair Value Measurements as of December 31, 2021 Description Balance Sheet Classification Total Level 1 Level 2 Level 3 Cash and cash equivalents Cash and cash equivalents $ 918 $ 918 $ — $ — The Company had no transfers of assets or liabilities between fair value hierarchy levels during the years ended December 31, 2022 and 2021.

Related Parties

Related Parties	12 Months Ended
	Dec. 31, 2022
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 $2 million for each of the years ended December 31, 2022, 2021 and 2020 for these fees, which are included as other operating expenses within the Company’s 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 December 31, 2022, Indigo Partners holds approximately 18% of the total outstanding common stock of Volaris.

The Proposed Merger with Spirit

The Proposed Merger with Spirit Airlines, Inc. ("Spirit")	12 Months Ended
	Dec. 31, 2022
Business Combination and Asset Acquisition [Abstract]
The Proposed Merger with Spirit Airlines, Inc.	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 year ended December 31, 2022, the Company recorded $10 million in net expenses related to the proposed Merger within transaction and merger-related costs, net in the Company’s consolidated statement of operations. These costs included $19 million in retention bonus expense, which included an acceleration of 50% of Merger-related retention costs for all eligible employees who were not subject to CARES Act compensation restrictions, and $16 million in transaction costs, which are made up of banking, legal and accounting fees, among others, offset by $25 million received from Spirit for reimbursement of incurred Merger-related expenses in accordance with the termination provisions set forth in the Merger Agreement. 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)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of PresentationThe consolidated financial statements have been prepared in accordance with the generally accepted accounting principles in the United States (“GAAP”)
Consolidation	The 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.
Reclassification Policy	A reclassification of previously reported amounts has been made to conform to the current year’s presentation in the Company’s consolidated statements of cash flows. The reclassification relates to the removal of cash flows for derivative instruments, net within the operating section and the reclassification of those cash outflows into supplies and other current assets within the changes in operating assets and liabilities section of the Company’s consolidated statements of cash flows. This reclassification did not impact previously reported amounts on the Company’s audited consolidated balance sheets, consolidated statements of operations, consolidated statements of comprehensive income (loss), or consolidated statements of stockholders’ equity and there was no impact to the total operating, investing or financing cash flows within the consolidated statements of cash flows. In addition, certain reclassifications of previously reported amounts have been made to conform to the current year presentation in Note 4. Other Current Assets, Note 13. Other Long-Term Liabilities and within the effective income tax rate table in Note 17. Income Taxes. These reclassifications did not impact previously reported amounts on the Company’s audited consolidated balance sheets, consolidated statements of operations, consolidated statements of comprehensive income (loss), consolidated statements of cash flows or consolidated statements of stockholders’ equity.
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.
Cash and Cash Equivalents, Restricted Cash	Cash and Cash Equivalents The Company considers all highly liquid investments with original maturities of three months or less at the date of acquisition to be cash and cash equivalents. Additionally, any items with maturities greater than three months that are readily convertible to known amounts of cash are considered cash and cash equivalents. Investments included in this category primarily consist of money market funds and time deposits. Restricted Cash
Accounts Receivable, net	Accounts Receivable, netReceivables primarily consist of amounts due from credit card receivables, amounts due from select airport locations under revenue share agreements and amounts due from aircraft lessors for maintenance performed. The Company records an allowance for credit losses for amounts not expected to be collected. The Company estimates the allowance based on expected credit losses.
Supplies, net	Supplies, netSupplies consist of expendable aircraft spare parts, aircraft fuel and other supplies and are stated at the lower of cost or net realizable value. Supplies are accounted for on a first-in, first-out basis and are charged to expense as they are used. An allowance for obsolescence on expendable aircraft spare parts is provided over the remaining lease term or the estimated useful life of the related aircraft fleet to reduce the carrying cost of spare parts currently identified as excess to the lower of amortized cost or net realizable value.
Property and Equipment, net	Property and Equipment, net Property and equipment are stated at cost and depreciated on a straight-line basis over their estimated useful lives to their estimated residual values. The Company capitalizes additions, modifications enhancing the operating performance of its assets and the interest related to payments used to acquire new aircraft and the construction of its facilities. The Company capitalizes interest attributable to pre-delivery deposit payments (“PDPs”) as an additional cost of the related asset beginning when activities necessary to get the asset ready for its intended use commence.
Leases	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 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. When available, the rate implicit in the lease is used to discount lease payments to present value; however, most leases do not provide a readily determinable implicit rate. Therefore, the Company estimates its incremental borrowing rate (“IBR”) to discount the lease payments based on information available at lease commencement. The IBR utilized by the Company is first determined using an unsecured recourse borrowing rate over a tenor that matches the period of lease payments for each individual lease and then is adjusted to arrive at a rate that is representative of a collateralized rate (secured rate). Given the Company does not have an established unsecured public credit rating, the Company utilizes current period and projected financial information to simulate an unsecured credit rating. The Company then determines its secured IBR using a combination of several valuation methods that take into account the lower amount of risk of collateralized borrowings along with observable implied credit ratings from its current outstanding secured debt obligations.
Asset Impairment	Asset Impairment The Company applies a fair value-based impairment test to the carrying amount of indefinite-lived intangible assets annually, or more frequently if certain events or circumstances indicate impairment. The Company assesses the value of indefinite-lived assets under a qualitative and quantitative approach, as required. Under a qualitative approach, the Company considers various market factors, including applicable key assumptions listed below. These factors are analyzed to determine if events and circumstances indicate that it is more likely than not that an indefinite-lived intangible asset's fair value is less than its carrying value. The quantitative approach is used to assess the asset’s fair value and the amount of the impairment. If the asset’s carrying amount exceeds its fair value calculated using the quantitative approach, an impairment charge is recorded for the difference in fair value and carrying amount. Indefinite-lived intangible assets are comprised of certain landing slot rights and the trademark of the Company. Factors that could result in future impairment of landing slot rights, holding other assumptions constant, include, but are not limited to: (i) significant reduction in demand for air travel, (ii) competitive activity in the slotted airport, (iii) anticipated changes to the regulatory environment such as diminished slot access and (iv) increased competition at a nearby airport. As part of this evaluation, the Company assesses whether changes in (i) macroeconomic conditions, (ii) industry and market conditions, (iii) cost factors, (iv) overall financial performance and (v) certain events specific to the Company, have occurred which would impact the use and/or fair value of these assets. As a result of the COVID-19 pandemic the Company performed a quantitative assessment on its indefinite-lived intangibles during 2020 and determined no impairment charges were necessary. As a result of the continued recovery during 2021 and 2022 and the substantial headroom between the book values and fair values of its indefinite-lived intangibles assets determined as part of the 2020 quantitative assessment, the Company performed qualitative assessments during 2022 and 2021, which resulted in no impairments. The Company records impairment charges on long-lived assets used in operations and finite-lived intangible assets when events and circumstances indicate that the assets may be impaired and the undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of those assets, and the net book value of the assets exceeds their estimated fair value. In making these determinations, the Company uses certain assumptions, including, but not limited to: (i) estimated fair value of the assets; and (ii) estimated undiscounted future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization including macroeconomic factors impacting future demand, length of service the asset will be used in the Company’s operations and estimated salvage values. There were no events or circumstances identified during 2022 that required the Company to perform a quantitative impairment assessment.
Aircraft Maintenance	Aircraft Maintenance The Company accounts for heavy maintenance and major overhauls under the deferral method, whereby the cost of heavy maintenance and major overhauls is deferred and recorded as flight equipment and depreciated over the lesser of the remaining lease term or the period until the next scheduled heavy maintenance event. The Company has separate maintenance cost-per-hour contracts for the repair of certain rotable parts to support airframe and engine maintenance and repair, as well as heavy maintenance and major overhauls. These agreements require monthly payments based upon utilization, such as flight hours, cycles and age of the aircraft. For the contracts in which risk has been determined to transfer to the service provider, expense is recognized based on the contractual terms of the cost-per-hour arrangement. For those contracts in which risk has not been determined to transfer to the service provider, the Company initially records monthly payments as a deposit included in other assets on the Company’s consolidated balance sheets and then accounts for the underlying maintenance event when it occurs, in accordance with the Company’s maintenance accounting policy. 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. At lease inception and at each balance sheet date, the Company assesses whether the maintenance reserve payments required by its leases are substantively and contractually related to the maintenance of the leased asset. Maintenance reserve payments that are determined to be related to the maintenance of the leased asset are accounted for as maintenance deposits, to the extent they are expected to be recoverable, and are reflected as aircraft maintenance deposits on the Company’s consolidated balance sheets. As the eligible maintenance is performed, the maintenance deposits are recorded in accounts receivable, net on the Company’s consolidated balance sheets. When it is not probable that the Company will recover amounts currently on deposit with a lessor, such amounts are expensed as supplemental rent within aircraft rent in the Company’s consolidated statements of operations. Maintenance reserve payments that are based on a utilization measure and are not probable of being recovered are considered variable lease payments and are not included within the right-of-use asset and respective lease liability. The Company makes certain assumptions at the inception of the lease and at each balance sheet date to determine the recoverability of maintenance deposits. These assumptions are based on various factors, such as the estimated time between the maintenance events, the cost of such maintenance events, the date the aircraft is due to be returned to the lessor and the number of flight hours and cycles the aircraft is estimated to be utilized before it is returned to the lessor. Changes in estimates are accounted for on a cumulative catch-up basis. On a regular basis, the Company assesses the credit worthiness of the Company’s lessors to ensure deposits are collectible and, specifically, whether any credit losses exist for aircraft maintenance deposits. Based on these assessments, the Company determined no allowance was necessary as of December 31, 2022 and 2021.
Leased Aircraft Return Costs	Leased Aircraft Return Costs The Company’s aircraft lease agreements generally contain provisions that require the Company to return aircraft airframes and engines to the lessor in a specified condition or pay an amount to the lessor based on the airframe and engine’s actual return condition. Lease return costs include all costs that would be incurred at the return of the aircraft, including costs incurred to repair the airframe and engines to the condition required by the lease. Lease return costs could include, but are not limited to, redelivery cost, redelivery crew cost, fuel, final inspections, reconfiguration of the cabin, repairs to the airframe, painting, overhaul of engines, replacement of components and checks. These return provisions are evaluated at inception of the lease and throughout the lease terms and are accounted for as either fixed or variable lease payments (depending on the nature of the lease return condition) when it is probable that such amounts will be incurred. When determining probability and estimated cost, there are various other factors which need to be considered such as current condition of the aircraft, the age of the aircraft at lease expiration, number of hours run on the engines, number of cycles run on the airframe, projected number of hours run on the engine at the time of return, the projected number of cycles run on the airframe at the time of return, the extent of repairs needed, if any, upon return, return locations, current configuration of the aircraft, current paint of the aircraft, estimated escalation of cost of repairs and materials at the time of return, current flight hour agreement rates and future flight hour agreement rates. In addition, typically near the lease return date, the lessors may allow maintenance reserves to be applied as return condition consideration or pass on certain return provisions if they do not align with their current plans to remarket the aircraft. As a result of the different factors listed above, management assesses the need to accrue lease return costs throughout the lease as facts and circumstances warrant an assessment. When costs become both probable and estimable, lease return costs are expensed as a component of aircraft rent in the Company’s consolidated statements of operations through the remaining lease term.
Derivative Instruments	Derivative Instruments Fuel Hedging Activities Variability in jet fuel prices impacts the Company’s results of operations. In order to reduce the risk of exposure to fuel price increases, the Company may enter into derivative contracts such as swaps, call options and collars. Derivative instruments are stated at fair value, net of any collateral postings. The Company formally designates and accounts for the derivative instruments that meet established accounting criteria under ASC 815, Derivatives and Hedging , as cash flow hedges. For derivative instruments that are designated and qualify as cash flow hedges, the gain or loss on the derivative instruments is recorded in accumulated other comprehensive income/loss (“AOCI/L”), a component of stockholders’ equity on the Company’s consolidated balance sheets. The Company recognizes the associated gains or losses deferred in AOCI/L, as well as the amounts that are paid or received in connection with the purchase or sale of fuel-related financial derivative instruments (i.e., premium costs of option contracts), as a component of aircraft fuel expense within the Company’s consolidated statements of operations in the period that the aircraft fuel is consumed. For derivative instruments that are not designated as cash flow hedges, the gain or loss on the instrument is recognized in current period earnings. Cash flows related to fuel derivative instruments are classified as operating activities in the Company's consolidated statements of cash flows. The Company presents its fuel derivative instruments gross on its consolidated balance sheets. The Company does not enter into derivative instruments for speculative purposes. Refer to Note 7 for additional information regarding the Company’s hedge accounting and derivative instruments. Aircraft and Spare Engine Purchase Hedging Activities The Company is party to certain interest rate swaption agreements that are accounted for as cash flow hedges, as defined under ASC 815, Derivatives and Hedging
Revenue	Passenger Revenues Fare revenues. Tickets sold in advance of the flight date are initially recorded as an air traffic liability on the Company’s consolidated balance sheets. Fare revenues are recognized in passenger revenues within the Company’s consolidated statements of operations at the time of departure when transportation is provided. Non-fare passenger revenues. Certain ancillary items such as service fees, baggage and seat selection deemed part of providing passenger transportation are recognized to non-fare passenger revenues in passenger revenues within the Company’s consolidated statements of operations. Service fees include, among other things, convenience fees, charges for nonrefundable ticket expiration, cancellation charges and service charges assessed for itinerary changes made prior to the date of departure. Such change fees are recognized at the time of departure of the newly scheduled travel. Beginning in March 2020, resulting from the reduction in demand from the COVID-19 pandemic, the Company waived cancellation and change fees for customers for most of 2020 and the first quarter of 2021. Passenger Taxes and Fees. The Company is required to collect certain taxes and fees from customers on behalf of government agencies and airports and remit these back to the applicable governmental entity or airport on a periodic basis. These taxes and fees include U.S. federal transportation taxes, federal security charges, airport passenger facility charges, and foreign arrival and departure taxes. These taxes and fees are collected from customers at the time they purchase their tickets but are not included in passenger revenues. The Company records a liability within other current liabilities on the its consolidated balance sheets upon collection from the customer, and reduces the liability when payments are remitted to the applicable governmental agency or airport. Other Revenues Other revenues primarily consists of services not directly related to providing transportation, such as the advertising, marketing and brand elements of the Frontier Miles affinity credit card program and commissions revenue from the third-party sale of items such as rental cars and hotels. 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. Mileage credits are also sold to participating companies, including credit card companies and other third parties. Sales to credit card companies include multiple promised goods and services, which the Company evaluates to determine whether they represent performance obligations. The Company determined these arrangements have three separate performance obligations: (i) mileage credits to be awarded, (ii) licensing of brand and access to member lists and (iii) advertising and marketing efforts. Total arrangement consideration is allocated to each performance obligation on the basis of the deliverables relative standalone selling price. For mileage credits, the Company considers a number of entity-specific factors when developing the best estimate of the standalone selling price, including the number of mileage credits needed to redeem an award, average fare of comparable segments, breakage and restrictions. For licensing of brand and access to member lists, the Company considers both market-specific factors and entity-specific factors, including general profit margins realized in the marketplace and industry, brand power, market royalty rates and size of customer base. For the advertising and marketing performance obligation, the Company considers market-specific factors and entity-specific factors, including the Company’s internal costs of providing services, volume of marketing efforts and overall advertising plan. Consideration allocated based on the relative standalone selling price to both the brand licensing and access to member lists and advertising and marketing elements is recognized as other revenue in the Company’s consolidated statements of operations over time as mileage credits are delivered. The consideration allocated to the transportation portion of these mileage credit sales is deferred and recognized as a component of passenger revenue in the Company’s consolidated statements of operations at the time of travel for mileage credits redeemed. Mileage credits that the Company estimates are not likely to be redeemed are subject to breakage and are recognized as a portion of passenger revenues in the Company’s consolidated statements of operations in proportion to the pattern of rights exercised by customers. Management uses statistical modeling to estimate breakage based on historical redemption patterns. A change in assumptions as to the period over which mileage credits are expected to be redeemed, the actual redemption activity for mileage credits or the estimated fair value of mileage credits expected to be redeemed could have an impact on revenues in the year in which the change occurs and in future years. Redemptions are allocated between sold and flown mileage credits based on historical patterns.
Aircraft Fuel	Aircraft FuelAircraft fuel expense includes jet fuel and associated into-plane costs, federal and state taxes and the amortized gains, losses and premiums associated with effective fuel hedge contracts within AOCI/L and gains and losses from ineffective or de-designated fuel hedge contracts.
Sales and Marketing	Sales and MarketingSales and marketing expense includes credit card processing fees, system booking fees, sponsorship and distribution costs such as the costs of the Company’s contact centers and advertising costs. Advertising and the related production costs are expensed as incurred
Income Taxes	Income TaxesThe Company accounts for income taxes using the asset and liability method. Deferred income taxes are recognized for the tax consequences of temporary differences between the tax and financial statement reporting bases of assets and liabilities. The Company periodically assesses whether it is more likely than not that sufficient taxable income will be generated to realize deferred income tax assets, and a valuation allowance is established if it is not likely that deferred income tax assets will be realized. The Company considers sources of taxable income from prior period carryback periods, future reversals of existing taxable temporary differences, tax planning strategies and future projected taxable income when assessing the future realization of deferred tax assets. In assessing the sources of income and the need for a valuation allowance, the Company considers all available positive and negative evidence, which includes a recent history of cumulative losses.
Stock-Based Compensation	Stock-Based CompensationThe Company recognizes cost of employee services received in exchange for awards of equity instruments based on the fair value of each instrument at the date of grant. Compensation expense is recognized over the period during which an employee is required to provide service in exchange for an award, with forfeitures accounted for as they occur. The fair value of stock option awards is estimated on the date of grant using the Black-Scholes valuation model. Restricted stock awards and restricted stock units are valued at the fair value of the shares on the date of grant. The exercise price of all stock awards is determined by the Company’s board of directors based, in part, on the ending stock price on the grant date. Prior to the Company’s IPO, there were significant judgments and estimates inherent in these valuations which included assumptions regarding the Company’s future operating performance, the time to complete potential liquidity events and the determinations of the appropriate valuation methods to be applied.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements The Company did not adopt any previously issued accounting pronouncements during the year ended December 31, 2022 and none of the recently issued accounting pronouncements are expected to have a material impact on the Company’s consolidated financial statements.
Gains on Sale-Leaseback Transactions	Gains on Sale-Leaseback Transactions The Company enters into sale-leaseback transactions for its aircraft and aircraft engine assets, whereby the Company sells one or more aircraft or aircraft engine assets to a third-party and simultaneously enters into an operating lease for a right to use such assets for a fixed period of time. Gains on sale-leaseback transactions are recognized in the period in which title to the asset transfers to the buyer-lessor and the lease commences, as a
Fair Value Measurement	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 December 31, 2022 and 2021, 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 done 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.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Estimated Useful Lives and Depreciation Expense For the Company’s Property and Equipment	Estimated useful lives and residual values for the Company’s property and equipment are as follows: Estimated Useful Life Residual Value Aircraft 25 years 10% Flight equipment leasehold improvements Lesser of lease term or economic life 0% Aircraft rotable parts Fleet life 10% Ground property and equipment 3 – 10 years 0% Ground equipment leasehold improvements Lesser of lease term or 10 years 0% Internal-use software 3 – 10 years 0% Capitalized maintenance Lesser of lease term or economic life 0% Buildings Lesser of 40 years or economic life 10% The components of depreciation and amortization expense are as follows (in millions): Year Ended December 31, 2022 2021 2020 Depreciation $ 44 $ 38 $ 32 Intangible amortization 1 — 1 Total depreciation and amortization $ 45 $ 38 $ 33 The components of property and equipment, net are as follows (in millions): December 31, 2022 2021 Flight equipment $ 255 $ 212 Ground and other equipment 122 104 Less: accumulated depreciation (151) (130) Total property and equipment, net $ 226 $ 186

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Disaggregated operating revenues are as follows (in millions): Year Ended December 31, 2022 2021 2020 Passenger revenues: Fare $ 1,382 $ 806 $ 548 Non-fare passenger revenues: Service fees 817 521 303 Baggage 741 457 229 Seat selection 251 170 84 Other 57 46 43 Total non-fare passenger revenue 1,866 1,194 659 Total passenger revenues 3,248 2,000 1,207 Other revenues 78 60 43 Total operating revenues $ 3,326 $ 2,060 $ 1,250
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): Year Ended December 31, 2022 2021 2020 Domestic $ 3,051 $ 1,950 $ 1,201 Latin America 275 110 49 Total operating revenues $ 3,326 $ 2,060 $ 1,250

Other Current Assets (Tables)

Other Current Assets (Tables)	12 Months Ended
	Dec. 31, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Current Assets	Other current assets consist of the following (in millions): December 31, 2022 2021 Supplier incentives $ 55 $ 11 Derivative instruments 24 — Prepaid expenses 20 14 Income tax and other taxes receivable 8 12 Other 7 3 Total other current assets $ 114 $ 40

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Schedule of Components of Property and Equipment, Net	Estimated useful lives and residual values for the Company’s property and equipment are as follows: Estimated Useful Life Residual Value Aircraft 25 years 10% Flight equipment leasehold improvements Lesser of lease term or economic life 0% Aircraft rotable parts Fleet life 10% Ground property and equipment 3 – 10 years 0% Ground equipment leasehold improvements Lesser of lease term or 10 years 0% Internal-use software 3 – 10 years 0% Capitalized maintenance Lesser of lease term or economic life 0% Buildings Lesser of 40 years or economic life 10% The components of depreciation and amortization expense are as follows (in millions): Year Ended December 31, 2022 2021 2020 Depreciation $ 44 $ 38 $ 32 Intangible amortization 1 — 1 Total depreciation and amortization $ 45 $ 38 $ 33 The components of property and equipment, net are as follows (in millions): December 31, 2022 2021 Flight equipment $ 255 $ 212 Ground and other equipment 122 104 Less: accumulated depreciation (151) (130) Total property and equipment, net $ 226 $ 186

Intangible Assets, net (Tables)

Intangible Assets, net (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	The following table summarizes the Company’s intangible assets, net (in millions): December 31, 2022 2021 Amortization Gross Accumulated Net Carrying Amount Gross Accumulated Net Carrying Amount Indefinite-lived: Airport slots Indefinite $ 20 $ — $ 20 $ 20 $ — $ 20 Trademarks Indefinite 6 — 6 6 — 6 26 — 26 26 — 26 Finite-lived: Affinity credit card program 16 years 16 (14) 2 16 (13) 3 Total intangible assets, net $ 42 $ (14) $ 28 $ 42 $ (13) $ 29
Summary of Intangible Assets	The following table summarizes the Company’s intangible assets, net (in millions): December 31, 2022 2021 Amortization Gross Accumulated Net Carrying Amount Gross Accumulated Net Carrying Amount Indefinite-lived: Airport slots Indefinite $ 20 $ — $ 20 $ 20 $ — $ 20 Trademarks Indefinite 6 — 6 6 — 6 26 — 26 26 — 26 Finite-lived: Affinity credit card program 16 years 16 (14) 2 16 (13) 3 Total intangible assets, net $ 42 $ (14) $ 28 $ 42 $ (13) $ 29

Financial Derivative Instrume_2

Financial Derivative Instruments and Risk Management (Tables)	12 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Effect of Fuel and Interest Rate Derivative Instruments Reflected in Aircraft Fuel and Rent Expense	The following table summarizes the effect of fuel and interest rate derivative instruments reflected in aircraft fuel and rent expense, respectively, within the Company’s consolidated statements of operations (in millions): Year Ended December 31, 2022 2021 2020 Derivatives designated as cash flow hedges Losses on fuel derivative contracts $ — $ — $ (26) Amortization of cash flow hedges $ (1) $ (1) $ (1) Derivatives not designated as cash flow hedges Losses on fuel derivative contracts $ — $ — $ (56)
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 consolidated statements of comprehensive income (loss) (in millions): Year Ended December 31, 2022 2021 2020 Derivatives designated as cash flow hedges Fuel derivative contract gains (losses), net of tax $ — $ — $ (16) Fuel derivative losses reclassified to earnings due to de-designation, net of tax — — 11 Interest rate derivative contract gains (losses), net of tax 3 — (10) Amortization of cash flow hedges, net of tax 1 1 — Total $ 4 $ 1 $ (15)

Other Current Liabilities (Tabl

Other Current Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Schedule of Other Current Liabilities	Other current liabilities consist of the following (in millions): December 31, 2022 2021 Passenger and other taxes and fees payable $ 113 $ 84 Salaries, wages and benefits 104 89 Leased aircraft return costs 84 25 Aircraft maintenance 63 36 Station obligations 57 64 Fuel liabilities 34 23 Current portion of phantom equity units (Note 11) — 26 Other current liabilities 63 36 Total other current liabilities $ 518 $ 383

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Schedule of Debt Obligations	The Company’s debt obligations are as follows (in millions): December 31, 2022 2021 Secured debt: Pre-delivery credit facility (a) $ 277 $ 174 Floating rate building note (b) 17 18 Treasury Loan (c) — 150 Unsecured debt: Affinity card advance purchase of mileage credits (d) 71 15 PSP Promissory Notes (e) 66 66 Total debt 431 423 Less current maturities of long-term debt (157) (127) Less debt acquisition costs and other discounts, net (2) (9) Long-term debt, net $ 272 $ 287 __________________ (a) The Company, through an affiliate, entered into the 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 14) through the term of the facility, which extends through December 2025. As of December 31, 2022, the PDP Financing Facility allows for total commitments up to $290 million. Interest is paid every 90 days based on the 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 contemplated in the PDP Financing Facility, as currently in effect, 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 agreement, 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 LIBOR plus a margin is payable monthly. (c) On September 28, 2020, the Company entered into the Treasury Loan with the Treasury for a term loan facility of up to $574 million, and had borrowed $150 million under the loan as of December 31, 2021. On February 2, 2022, the Company repaid the Treasury Loan in full, along with accrued interest and associated fees of $1 million. Additionally, the Company recognized a $7 million loss on the extinguishment of debt for the year ended December 31, 2022 from the write-off of unamortized deferred financing costs associated with the Treasury Loan. The repayment terminated the loan agreement with the Treasury and substantially unencumbered the Company’s co-branded credit card program and related brand assets that secured the Treasury Loan. (d) The Company entered into an agreement with Barclays in 2003 which, as amended, provides for joint marketing, grants certain benefits to co-branded credit cardholders (“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. Per the terms of the Treasury Loan, the facility amount could not be extended above $15 million until full extinguishment of the Treasury Loan, which occurred in February 2022, and, as a result, the Company borrowed an additional $56 million in the first quarter of 2022. 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. (e) On April 30, 2020, the Company executed the PSP Promissory Note with the Treasury, pursuant to which the Company received a $33 million unsecured 10-year, low-interest loan. Subsequently, the Company entered into the PSP2 with the Treasury in January 2021 and the PSP3 with the Treasury in April 2021, from which the Company received an additional $18 million and $15 million, respectively, evidenced by the PSP2 Promissory Note and the PSP3 Promissory Note. 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.
Schedule of Maturities of Long-term Debt	As of December 31, 2022, future maturities of debt are payable as follows (in millions): December 31, 2022 2023 $ 157 2024 137 2025 — 2026 — 2027 — Thereafter 137 Total debt principal payments $ 431

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Supplemental Balance Sheet Information	The table below presents the lease-related assets and liabilities recorded on the Company’s consolidated balance sheets as of December 31, 2022 and 2021 (in millions): December 31, Balance Sheet Classification 2022 2021 Assets Operating lease assets Operating lease right-of-use assets $ 2,484 $ 2,426 Liabilities Current Operating Current maturities of operating leases $ 465 $ 444 Long-term operating leases Operating Long-term operating leases 2,034 1,991 Total lease liabilities $ 2,499 $ 2,435 Weighted-average remaining lease term Operating leases 8 years 7 years Weighted-average discount rate Operating leases 5.39 % 5.08 %
Schedule of Lease Costs	The table below presents certain information related to lease costs for operating leases during the years ended December 31, 2022, 2021 and 2020 (in millions): Year Ended December 31, 2022 2021 2020 Operating lease cost (a) $ 478 $ 454 $ 337 Variable lease cost (a) 219 284 220 Total lease costs $ 697 $ 738 $ 557 ______________
Reconciliation of Undiscounted Cash Flows	The table below reconciles the undiscounted cash flows as of December 31, 2022 (in millions) for each of the next five years and total of the remaining years to the operating lease liability recorded on the Company’s consolidated balance sheet: December 31, 2022 Operating Leases 2023 $ 478 2024 462 2025 447 2026 383 2027 317 Thereafter 1,005 Total undiscounted minimum lease rentals 3,092 Less: amount of lease payments representing interest (593) Present value of future minimum lease rentals 2,499 Less: current obligations under operating leases (465) Long-term operating lease obligations $ 2,034

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Summary of Stock Option Activity	A summary of stock option activity during the year ended December 31, 2022 is presented below: Number of Shares Weighted-Average Exercise Price Aggregate Grant Date Fair Value (in millions) Outstanding at January 1, 2022 7,651,407 $ 1.99 $ 8 Issued — — — Exercised (277,729) $ 2.69 (1) Forfeited — — — Outstanding at December 31, 2022 7,373,678 $ 1.96 $ 7 Exercisable at December 31, 2022 7,346,601 $ 1.93 $ 7
Summary of Restricted Stock Activity	A summary of Restricted Award activity during the years ended December 31, 2022, 2021 and 2020 is presented below: 2022 2021 2020 Number of Shares Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Grant Date Fair Value Number of Shares Weighted-Average Grant Date Fair Value Outstanding at January 1 1,970,294 $ 12.47 2,020,650 $ 10.54 368,714 $ 12.17 Issued 1,344,532 $ 11.96 899,800 $ 14.70 1,869,372 $ 10.39 Vested (533,065) $ 12.48 (543,879) $ 10.23 (151,430) $ 12.22 Forfeited (73,711) $ 11.98 (205,542) $ 10.62 (26,942) $ 11.05 Repurchased (a) (312,541) $ 12.14 (200,735) $ 11.00 (39,064) $ 11.82 Outstanding at December 31 2,395,509 $ 12.24 1,970,294 $ 12.47 2,020,650 $ 10.54 __________________ (a) Represents withholdings to cover tax obligations on vested shares when applicable

Other Long-Term Liabilities (Ta

Other Long-Term Liabilities (Tables)	12 Months Ended
	Dec. 31, 2022
Other Liabilities Disclosure [Abstract]
Other Long-Term Liabilities	Other long-term liabilities consist of the following (in millions): December 31, 2022 2021 Deferred supplier incentives $ 43 $ 14 Leased aircraft return costs 18 24 Deferred revenue 18 21 Other 18 1 Total other long-term liabilities $ 97 $ 60

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Long-term Purchase Commitment	As of December 31, 2022, the Company’s firm aircraft and engine orders consisted of the following: A320neo A321neo Total Engines Year Ending 2023 — 13 13 4 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 67 154 221 19
Multiemployer Plan	The table below sets forth the Company’s employee groups and status of the collective bargaining agreements as of December 31, 2022: Percentage of Workforce Employee Group Representative Amendable Date December 31, 2022 Pilots Air Line Pilots Association (ALPA) January 2024 31% Flight Attendants Association of Flight Attendants (AFA-CWA) May 2024 52% Aircraft Technicians International Brotherhood of Teamsters (IBT) May 2025 (a) 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) The Company conducted off-cycle negotiations in May 2022 with its aircraft technicians, represented by IBT, where the amendable date was extended from March 2024 to May 2025. (b) The Company’s collective bargaining agreements with its dispatchers and material specialists, represented by TWU and IBT, respectively, were still amendable as of December 31, 2022 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)	12 Months Ended
	Dec. 31, 2022
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 data): Year Ended December 31, 2022 2021 2020 Basic: Net income (loss) $ (37) $ (102) $ (225) Less: net income attributable to participating rights — — — Net income (loss) attributable to common stockholders $ (37) $ (102) $ (225) Weighted-average common shares outstanding, basic 217,601,373 211,436,542 199,260,410 Net earnings (loss) per share, basic $ (0.17) $ (0.48) $ (1.13) Diluted: Net income (loss) $ (37) $ (102) $ (225) Less: net income attributable to participating rights — — — Net income (loss) attributable to common stockholders $ (37) $ (102) $ (225) Weighted-average common shares outstanding, basic 217,601,373 211,436,542 199,260,410 Effect of dilutive potential common shares — — — Weighted-average common shares outstanding, diluted 217,601,373 211,436,542 199,260,410 Net earnings (loss) per share, diluted $ (0.17) $ (0.48) $ (1.13)

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Components of Income Tax Expense	The components of income tax expense are as follows (in millions): Year Ended December 31, 2022 2021 2020 Current: Federal $ — $ (10) $ (134) State and local — — 1 Current income tax expense (benefit) — (10) (133) Deferred: Federal (7) (32) (5) State and local (1) (1) (9) Foreign — 1 — Deferred income tax expense (benefit) (8) (32) (14) Total income tax expense (benefit) $ (8) $ (42) $ (147)
Schedule of Effective Income Tax Rate Reconciliation	The income tax provision differs from that computed at the federal statutory corporate tax rate as follows: Year Ended December 31, 2022 2021 2020 U.S. federal statutory income tax rate 21.0 % 21.0 % 21.0 % State taxes, net of federal benefit 1.7 1.6 2.1 Excess tax benefits of stock-based compensation 1.2 5.2 — Reserves for uncertain tax positions, net 0.6 6.2 (0.2) Nondeductible warrants — (3.5) (0.5) Impact of the CARES Act — — 16.9 Executive compensation limitation (3.9) (0.5) — Return to provision adjustment (2.9) — — Other 0.1 (0.8) 0.2 Effective income tax rate 17.8 % 29.2 % 39.5 %
Schedule of Deferred Tax Assets and Liabilities	The following table shows the components of the Company’s deferred tax assets and liabilities (in millions): December 31, 2022 2021 Deferred tax assets: Operating lease liability $ 568 $ 551 Net operating losses 50 47 Nondeductible accruals 42 32 Deferred revenue 14 12 Income tax credits 1 2 Valuation allowance (8) (8) Other 10 10 Deferred tax assets $ 677 $ 646 Deferred tax liabilities: Right-of-use asset $ (559) $ (545) Property and equipment (41) (36) Maintenance deposits (24) (22) Intangibles (6) (6) Other (14) (12) Deferred tax liabilities (644) (621) Net deferred tax assets (liabilities) $ 33 $ 25
Schedule of Unrecognized Tax Benefits Roll Forward	The following table shows the components of the Company’s unrecognized tax benefits related to uncertain tax positions (in millions): 2022 2021 2020 Unrecognized tax benefits at January 1 $ 1 $ 10 $ 9 Decrease for tax positions taken during prior period — (9) — Increase for tax positions taken during current period — — 1 Unrecognized tax benefits at December 31 $ 1 $ 1 $ 10

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2022
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): December 31, 2022 December 31, 2021 Carrying Estimated Fair Value Carrying Value Estimated Fair Value Secured debt: Pre-delivery credit facility $ 277 $ 277 $ 174 $ 175 Floating rate building note 17 17 18 19 Treasury Loan — — 150 156 Unsecured debt: Affinity card advance purchase of mileage credits 71 66 15 14 PSP Promissory Note 66 52 66 58 Total debt $ 431 $ 412 $ 423 $ 422
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 in the Company’s consolidated financial statements (in millions): 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 $ — Fair Value Measurements as of December 31, 2021 Description Balance Sheet Classification Total Level 1 Level 2 Level 3 Cash and cash equivalents Cash and cash equivalents $ 918 $ 918 $ — $ —

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Basis of Presentation (Details)	12 Months Ended
	Dec. 31, 2022 airport reportableSegment
Accounting Policies [Abstract]
Number of airports served | airport	100
Number of reportable segments | reportableSegment	1

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Initial Public Offering (Details) $ in Millions	1 Months Ended
	Apr. 30, 2021 USD ($)
Class of Stock [Line Items]
Underwriting discounts and commissions	$ 14
Offering costs	5
IPO
Class of Stock [Line Items]
Proceeds from initial public offering, net of underwriting discounts and offering expenses	$ 266

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Restricted cash	$ 1	$ 1

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 4	$ 1

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Supplies, net (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Allowance for obsolescence	$ 8	$ 12

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Depreciation	$ 44,000	$ 38,000	$ 32,000
Intangible amortization	1,000	0	1,000
Total depreciation and amortization	45,000	38,000	$ 33,000
Property and equipment, net	$ 226,000	186,000
Aircraft
Property, Plant and Equipment [Line Items]
Useful life	25 years
Residual Value	10%
Aircraft rotable parts
Property, Plant and Equipment [Line Items]
Residual Value	10%
Ground property and equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Ground property and equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Ground equipment leasehold improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Capitalized software
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 10,000	$ 9,000
Capitalized software | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Capitalized software | Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Buildings
Property, Plant and Equipment [Line Items]
Residual Value	10%
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Useful life	40 years

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Aircraft Maintenance (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Allowance on deposits on aircraft maintenance	$ 0	$ 0

Summary of Significant Accou_11

Summary of Significant Accounting Policies - Advertising (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Advertising expenses	$ 9	$ 7	$ 4

Summary of Significant Accou_12

Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Valuation allowance	$ 8	$ 8

Summary of Significant Accou_13

Summary of Significant Accounting Policies - Concentrations of Risk (Details)	12 Months Ended
	Dec. 31, 2022 lessor employeeGroup vendor	Dec. 31, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Number of union-represented employee groups | employeeGroup	7
Amount of employees represented by unions	87%
Number of lessors with capitalized maintenance deposits | lessor	2
Number of vendors with pre-delivery deposits for flight equipment | vendor	1
Cost Risk | Operating Expense | Aircraft Fuel Cost
Concentration Risk [Line Items]
Concentration risk	34%	26%	21%

Impact of COVID-19 - COVID-19 R

Impact of COVID-19 - COVID-19 Relief Funding (Details) - USD ($)

5 Months Ended

6 Months Ended

9 Months Ended

12 Months Ended

Feb. 02, 2022

Apr. 30, 2020

Sep. 30, 2021

Sep. 30, 2020

Sep. 30, 2021

Sep. 30, 2020

Sep. 30, 2021

Sep. 30, 2021

Dec. 31, 2022

Dec. 31, 2021

Dec. 31, 2020

Sep. 28, 2020

Unusual Risk or Uncertainty [Line Items]

Long-term debt, gross

$ 431,000,000

$ 423,000,000

Principal repayments on debt

266,000,000

97,000,000

$ 126,000,000

Interest paid

14,000,000

9,000,000

7,000,000

Mark to market adjustment on warrant

0

22,000,000

$ 9,000,000

Employee retention credit

17,000,000

16,000,000

The Coronavirus Aid, Relief, and Economic Security Act | PSP1 Promissory Note

Unusual Risk or Uncertainty [Line Items]

Funding received

$ 211,000,000

Proceeds from Payroll Support Program grant

$ 178,000,000

178,000,000

Deferred financing costs

1,000,000

The Coronavirus Aid, Relief, and Economic Security Act | Consolidated Appropriations Act of 2021 - PSP 2

Unusual Risk or Uncertainty [Line Items]

Funding received

$ 161,000,000

Proceeds from Payroll Support Program grant

$ 143,000,000

143,000,000

The American Rescue Plan Act | American Rescue Plan Act - PSP 3

Unusual Risk or Uncertainty [Line Items]

Funding received

$ 150,000,000

Proceeds from Payroll Support Program grant

$ 135,000,000

CARES Act Credit Agreement, Warrants

Unusual Risk or Uncertainty [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

Unsecured Debt | PSP1 Promissory Note

Unusual Risk or Uncertainty [Line Items]

Term of grant

10 years

10 years

10 years

Unsecured low interest loan amount

$ 33,000,000

Unsecured Debt | Consolidated Appropriations Act of 2021 - PSP 2

Unusual Risk or Uncertainty [Line Items]

Term of grant

10 years

Unsecured low interest loan amount

$ 18,000,000

Unsecured Debt | PSP3 Promissory Note

Unusual Risk or Uncertainty [Line Items]

Term of grant

10 years

Unsecured low interest loan amount

$ 15,000,000

Line of Credit | CARES Credit Agreement

Unusual Risk or Uncertainty [Line Items]

Term loan amount

$ 574,000,000

Long-term debt, gross

$ 150,000,000

$ 150,000,000

Principal repayments on debt

$ 150,000,000

Interest paid

$ 1,000,000

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Capitalized Contract Cost [Line Items]
Air traffic liability	$ 328,000	$ 273,000
Unearned travel club revenue	(60,000)	(11,000)
Customer rights to book future travel	7,000	59,000
Passenger revenue recongnized	$ 82,000	$ 58,000	$ 126,000
Minimum
Capitalized Contract Cost [Line Items]
Future travel credit balance, expiration period	3 months
Maximum
Capitalized Contract Cost [Line Items]
Future travel credit balance, expiration period	12 months

Revenue Recognition - Disaggreg

Revenue Recognition - Disaggregated Operating Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 3,326	$ 2,060	$ 1,250
Total passenger revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	3,248	2,000	1,207
Fare
Disaggregation of Revenue [Line Items]
Total operating revenues	1,382	806	548
Total non-fare passenger revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	1,866	1,194	659
Service fees
Disaggregation of Revenue [Line Items]
Total operating revenues	817	521	303
Baggage
Disaggregation of Revenue [Line Items]
Total operating revenues	741	457	229
Seat selection
Disaggregation of Revenue [Line Items]
Total operating revenues	251	170	84
Other
Disaggregation of Revenue [Line Items]
Total operating revenues	57	46	43
Other revenues
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 78	$ 60	$ 43

Revenue Recognition - Operating

Revenue Recognition - Operating Revenues by Principal Geographic Region (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 3,326	$ 2,060	$ 1,250
Domestic
Disaggregation of Revenue [Line Items]
Total operating revenues	3,051	1,950	1,201
Latin America
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 275	$ 110	$ 49

Other Current Assets (Details)

Other Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Supplier incentives	$ 55	$ 11
Derivative instruments	24	0
Prepaid expenses	20	14
Income tax and other taxes receivable	8	12
Other	7	3
Total other current assets	$ 114	$ 40

Property and Equipment, Net - C

Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Less: accumulated depreciation	$ (151,000)	$ (130,000)
Total property and equipment, net	226,000	186,000
Flight equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	255,000	212,000
Ground and other equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 122,000	$ 104,000

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Deferred costs for heavy maintenance, net	$ 226,000	$ 186,000
Capitalized maintenance
Property, Plant and Equipment [Line Items]
Deferred costs for heavy maintenance	40,000	18,000	$ 9,000
Deferred costs for heavy maintenance, net	$ 46,000	$ 20,000

Intangible Assets, net - Summar

Intangible Assets, net - Summary of Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 26	$ 26
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, Accumulated Amortization	(14)	(13)
Total intangible assets, net, Gross Carrying Amount	42	42
Intangible assets, net	28	29
Airport slots
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	20	20
Trademarks
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 6	6
Affinity credit card program
Finite-Lived Intangible Assets [Line Items]
Amortization Period	16 years
Finite-lived intangible assets, Gross Carrying Amount	$ 16	16
Finite-lived intangible assets, Accumulated Amortization	(14)	(13)
Finite-lived intangible assets, net, total	$ 2	$ 3

Intangible Assets, net - Expect

Intangible Assets, net - Expected Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Expected future amortization expense (less than), 2023	$ 1,000
Expected future amortization expense (less than), 2024	1,000
Expected future amortization expense (less than), 2025	1,000
Expected future amortization expense (less than), 2026	1,000
Expected future amortization expense (less than), 2027	1,000
Expected future amortization expense (less than), 2028	1,000
Expected future amortization expense (less than), 2029	$ 1,000

Financial Derivative Instrume_3

Financial Derivative Instruments and Risk Management - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) aircraft	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Future engine deliveries with option to enter into and exercise cash settled swaps | aircraft	4
Derivative, other current assets	$ 24,000,000	$ 0
Fuel Derivative Contracts
Derivative [Line Items]
Cost of swap	0	0
Interest Rate Swap
Derivative [Line Items]
Cost of swap	19,000,000	$ 0	$ 4,000,000
Notional amount	$ 573,000,000
Future aircraft deliveries with option to enter into and exercise cash settled swaps | aircraft	14
Unrealized losses from cash flow hedges net of adjustment for dedesignation of fuel hedges, net of deferred tax benefit	$ 6,000,000

Financial Derivative Instrume_4

Financial Derivative Instruments and Risk Management - Effect of Fuel and Interest Rate Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fuel Derivative Contracts
Derivative [Line Items]
Losses on fuel derivative and interest rate derivative contracts	$ 0	$ 0	$ (26)
Losses on fuel derivative contracts	0	0	(56)
Cash flow hedge reclassification net of tax impact	0	0	(11)
Interest Rate Swap
Derivative [Line Items]
Losses on fuel derivative and interest rate derivative contracts	1	1	1
Cash flow hedge reclassification net of tax impact	$ 1	$ 1	$ 0

Financial Derivative Instrume_5

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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Derivative contract losses, net of tax impact	$ 4	$ 1	$ (15)
Fuel Derivative Contracts
Derivative [Line Items]
Fuel derivative and interest rate contract gains (losses) - net of tax impact	0	0	(16)
Cash flow hedge reclassification net of tax impact	0	0	(11)
Interest Rate Swap
Derivative [Line Items]
Fuel derivative and interest rate contract gains (losses) - net of tax impact	3	0	(10)
Cash flow hedge reclassification net of tax impact	$ 1	$ 1	$ 0

Other Current Liabilities (Deta

Other Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Passenger and other taxes and fees payable	$ 113	$ 84
Salaries, wages and benefits	104	89
Leased aircraft return costs	84	25
Aircraft maintenance	63	36
Station obligations	57	64
Fuel liabilities	34	23
Current portion of phantom equity units	0	26
Other current liabilities	63	36
Total other current liabilities	$ 518	$ 383

Debt - Schedule of Debt Obligat

Debt - Schedule of Debt Obligations (Details) - USD ($)			3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Feb. 02, 2022	Apr. 30, 2020	Mar. 31, 2022	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 28, 2020	Sep. 15, 2020
Debt Instrument [Line Items]
Long-term debt, gross						$ 431,000,000	$ 423,000,000
Less current maturities of long-term debt						(157,000,000)	(127,000,000)
Less debt acquisition costs and other discounts, net						(2,000,000)	(9,000,000)
Long-term debt, net						272,000,000	287,000,000
Interest paid						14,000,000	9,000,000	$ 7,000,000
Loss on extinguishment of debt						7,000,000	0	0
Proceeds from issuance of debt, net of issuance costs						273,000,000	163,000,000	$ 236,000,000
Secured Debt | Pre-delivery credit facility
Debt Instrument [Line Items]
Long-term debt, gross						277,000,000	174,000,000
Amount of unsecured borrowings available						$ 290,000,000
Periodic payment, interest, period						90 days
Secured Debt | Treasury Loan
Debt Instrument [Line Items]
Long-term debt, gross						$ 0	150,000,000
Secured Debt | Floating rate building note
Debt Instrument [Line Items]
Long-term debt, gross						17,000,000	18,000,000
Unsecured Debt | PSP Promissory Note
Debt Instrument [Line Items]
Long-term debt, gross						$ 66,000,000	66,000,000
Interest rate						1%
Interest rate period						5 years
Unsecured Debt | PSP Promissory Note | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument [Line Items]
Debt instrument, variable interest rate						2%
Unsecured Debt | PSP1 Promissory Note
Debt Instrument [Line Items]
Unsecured low interest loan amount		$ 33,000,000
Loan term		10 years		10 years				10 years
Unsecured Debt | Consolidated Appropriations Act of 2021 - PSP 2
Debt Instrument [Line Items]
Unsecured low interest loan amount					$ 18,000,000
Loan term						10 years
Unsecured Debt | Affinity card advance purchase of mileage credits
Debt Instrument [Line Items]
Long-term debt, gross						$ 71,000,000	15,000,000
Amount of unsecured borrowings available										$ 200,000,000
Borrowing capacity triggering full extinguishment of debt									$ 15,000,000
Proceeds from issuance of debt, net of issuance costs			$ 56,000,000
Unsecured Debt | PSP3 Promissory Note
Debt Instrument [Line Items]
Unsecured low interest loan amount					$ 15,000,000
Loan term						10 years
Line of Credit | Treasury Loan
Debt Instrument [Line Items]
Long-term debt, gross						$ 150,000,000	$ 150,000,000
Amount of unsecured borrowings available									$ 574,000,000
Interest paid	$ 1,000,000
Loss on extinguishment of debt						$ 7,000,000

Debt - Additional Information (

Debt - Additional Information (Details) - USD ($) $ in Millions		12 Months Ended
	Feb. 02, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal repayments on debt		$ 266	$ 97	$ 126
Interest paid		$ 14	$ 9	$ 7
CARES Credit Agreement | Line of Credit
Debt Instrument [Line Items]
Principal repayments on debt	$ 150
Interest paid	$ 1

Debt - Schedule of Maturity (De

Debt - Schedule of Maturity (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Debt Disclosure [Abstract]
2023	$ 157,000
2024	137,000
2025	0
2026	0
2027	0
Thereafter	137,000
Total debt principal payments	$ 431,000

Operating Leases - Aircraft (De

Operating Leases - Aircraft (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) aircraftEngine aircraft	Dec. 31, 2021 USD ($) aircraft aircraftEngine	Dec. 31, 2020 USD ($) aircraft aircraftEngine	Sep. 30, 2021 aircraft	Jun. 30, 2021 aircraft	May 31, 2021 aircraft
Lessee, Lease, Description [Line Items]
Gains recognized on sale-leaseback transactions | $	$ 87	$ 60	$ 48
Number of aircraft terminated						6
A-320
Lessee, Lease, Description [Line Items]
Number of aircraft returned		2
A-319
Lessee, Lease, Description [Line Items]
Number of aircraft terminated		4
Number of aircraft returned				2	2
A319, To Be Returned In Q2
Lessee, Lease, Description [Line Items]
Charge included as a component of rent expense | $		$ 10
Aircraft
Lessee, Lease, Description [Line Items]
Number of leases	120
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 | A-320 | Aircraft Sale Leaseback
Lessee, Lease, Description [Line Items]
Number of sale-leaseback transactions	13	13	9
Aircraft Engine
Lessee, Lease, Description [Line Items]
Number of leases | aircraftEngine	30
Number of engines dependent on usage-based metrics | aircraftEngine	12
Aircraft Engine | Aircraft Sale Leaseback
Lessee, Lease, Description [Line Items]
Number of sale-leaseback transactions | aircraftEngine	4	2	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 | $	$ 87	$ 60	$ 48

Operating Leases - Aircraft Ren

Operating Leases - Aircraft Rent Expense and Maintenance Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Aircraft rent expense	$ 556	$ 530	$ 396
Supplemental rent expense for maintenance-related reserves deemed non-recoverable	(1)	(3)	2
Supplemental rent expense related to probable lease return condition obligations	90	61	$ 25
Leased aircraft return cost liability	102	49
Aircraft maintenance deposits expected to be recoverable	117	108
Aircraft maintenance deposits expected to be recoverable, eligible maintenance performed	12	10
Aircraft maintenance deposits	105	$ 98
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	3
Maintenance reserve payments, due in year five	4
Maintenance reserve payments, due after year five	$ 5

Operating Leases - Airport Faci

Operating Leases - Airport Facilities (Details)	12 Months Ended
	Dec. 31, 2022 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	10 years

Operating Leases - Other Ground

Operating Leases - Other Ground Property and Equipment (Details) - Other Ground Property And Equipment - USD ($) $ in Thousands	Dec. 31, 2022	Jun. 30, 2022
Lessee, Lease, Description [Line Items]
Incentive to lessee		$ 22,000
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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Increase (decrease) in deferrals related to leases		$ (22)	$ 33
Aircraft Rental
Lessee, Lease, Description [Line Items]
Deferrals related to leases	$ 0	(31)	31
Station Operations
Lessee, Lease, Description [Line Items]
Deferrals related to leases	(3)	$ 9	$ 2
Station deferrals to be recognized in station operations	$ (8)

Operating Leases - Supplemental

Operating Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease right-of-use assets	$ 2,484	$ 2,426
Current maturities of operating leases	465	444
Long-term operating leases	2,034	1,991
Total lease liabilities	$ 2,499	$ 2,435
Weighted-average remaining lease term
Operating leases	8 years	7 years
Weighted-average discount rate
Operating leases	5.39%	5.08%

Operating Leases - Lease Cost (

Operating Leases - Lease Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease cost	$ 478	$ 454	$ 337
Variable lease cost	219	284	220
Total lease costs	$ 697	$ 738	$ 557

Operating Leases - Undiscounted

Operating Leases - Undiscounted Cash Flows (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
2023	$ 478
2024	462
2025	447
2026	383
2027	317
Thereafter	1,005
Total undiscounted minimum lease rentals	3,092
Less: amount of lease payments representing interest	(593)
Total lease liabilities	2,499	$ 2,435
Current maturities of operating leases	(465)	(444)
Long-term operating lease obligations	$ 2,034	$ 1,991

Operating Leases - Additional I

Operating Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lessee, Lease, Description [Line Items]
Cash paid for amounts included in measurement of lease liabilities	$ 464	$ 461	$ 340
Aircraft and Aircraft Engines
Lessee, Lease, Description [Line Items]
Acquired aircraft and engines through operating leases	$ 405	$ 500

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 15	$ 11	$ 8
Income tax benefit for stock-based compensation expense	3	2	2
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional income tax benefits for options exercised or vested	$ 1	$ 8	$ 1

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Options and Restricted Awards (Details) - USD ($) $ in Thousands			12 Months Ended
	Jan. 01, 2022	Apr. 01, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for issuance (in shares)			8,000,000
Options granted (in shares)			0	0	0
Stock option exercised (in shares)			277,729	2,202,895	0
Exercised, Aggregate Grant Date Fair Value			$ 3,000	$ 32,000
Aggregate Grant Date Fair Value			61,000
Unrecognized compensation cost related to unvested stock options			$ 1,000
Unrecognized compensation cost, period for recognition			8 months 12 days
Contractual term of exercisable options			2 years 2 months 12 days
2014 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)						38,000,000
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance (in shares)		7,000,000
Common stock issued (in shares)		11,000,000
Maximum number of shares of stock that may be issued upon the exercise of incentive stock options		1%
Maximum number of shares of stock that may be issued upon the exercise of incentive stock options (in shares)		30,000,000
Number of additional shares authorized	2,170,650
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period			4 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period			1 year
Aggregate fair value			$ 10,000	$ 11,000	$ 2,000
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period			3 years
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period			4 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period			1 year

Stock-Based Compensation - St_2

Stock-Based Compensation - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Shares
Beginning balance (in shares)	7,651,407
Granted (in shares)	0	0	0
Exercised (in shares)	(277,729)	(2,202,895)	0
Forfeited (in shares)	0
Ending balance (in shares)	7,373,678	7,651,407
Exercisable (in shares)	7,346,601
Weighted-Average Exercise Price
Beginning balance (in dollars per share)	$ 1.99
Granted (in dollars per share)	0
Exercised (in dollars per share)	2.69
Forfeited (in dollars per share)	0
Ending balance (in dollars per share)	1.96	$ 1.99
Exercisable (in dollars per share)	$ 1.93
Aggregate grant date fair value, outstanding at December 31, 2020	$ 8,000
Issued, aggregate grant date fair value	0
Exercised, aggregate grant date fair value	(1,000)
Forfeited, aggregate grant date fair value	0
Aggregate grant date fair value, outstanding at December 31, 2021	7,000	$ 8,000
Aggregate grant date fair value, exercisable	$ 7,000

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Weighted-Average Grant Date Fair Value
Unrecognized compensation cost, period for recognition	8 months 12 days
Restricted Stock Awards And Restricted Stock Units
Number of Shares
Beginning balance (in shares)	1,970,294	2,020,650	368,714
Issued (in shares)	1,344,532	899,800	1,869,372
Vested (in shares)	(533,065)	(543,879)	(151,430)
Forfeited (in shares)	(73,711)	(205,542)	(26,942)
Repurchased (in shares)	(312,541)	(200,735)	(39,064)
Ending balance (in shares)	2,395,509	1,970,294	2,020,650
Weighted-Average Grant Date Fair Value
Beginning balance (in dollars per share)	$ 12.47	$ 10.54	$ 12.17
Issued (in dollars per share)	11.96	14.70	10.39
Vested (in dollars per share)	12.48	10.23	12.22
Forfeited (in dollars per share)	11.98	10.62	11.05
Repurchased (in dollars per share)	12.14	11	11.82
Ending balance (in dollars per share)	$ 12.24	$ 12.47	$ 10.54
Unrecognized compensation cost	$ 18
Unrecognized compensation cost, period for recognition	2 years 1 month 6 days

Stock-Based Compensation - Liab

Stock-Based Compensation - Liability-Classified Awards (Details) - Phantom Share Units (PSUs) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2022	Mar. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Associated liability, previous			$ 137
Associated liability	$ 26	$ 111

Stock-Based Compensation - St_3

Stock-Based Compensation - Stockholders' Equity (Details) - $ / shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance (in shares)	750,000,000
Preferred stock authorized for issuance (in shares)			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
Nonvoting Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance (in shares)		150,000,000
Common stock, stated par (in dollars per share)	$ 0.001

Employee Retirement Plans - Fro

Employee Retirement Plans - Frontier 401(k) and FAPA Plan (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Apr. 30, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Expense related to matching contributions		$ 56	$ 46	$ 37
Frontier 401(k) Plan
Defined Contribution Plan Disclosure [Line Items]
Percent of match		50%
Annual vesting percentage		25%
Vesting period		4 years
Frontier 401(k) Plan | Maintenance Employee
Defined Contribution Plan Disclosure [Line Items]
Employer contribution, percent of employees' gross pay, initial percentage		2%
Frontier 401(k) Plan | All Employees Excluding Maintenance Employees
Defined Contribution Plan Disclosure [Line Items]
Employer contribution, percent of employees' gross pay, initial percentage		6%
Frontier 401(k) Plan | Flight Attendant
Defined Contribution Plan Disclosure [Line Items]
Percent of match	100%
Employer contribution, percent of employees' gross pay, initial percentage	6%
Frontier Airlines, Inc. Pilots Retirement Plan
Defined Contribution Plan Disclosure [Line Items]
Period following collective bargaining agreement						5 years
Frontier Airlines, Inc. Pilots Retirement Plan | Minimum
Defined Contribution Plan Disclosure [Line Items]
Nonelective contribution amount					12%
Frontier Airlines, Inc. Pilots Retirement Plan | Maximum
Defined Contribution Plan Disclosure [Line Items]
Nonelective contribution amount					15%

Other Long-Term Liabilities (De

Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Other Liabilities Disclosure [Abstract]
Deferred supplier incentives	$ 43,000	$ 14,000
Leased aircraft return costs	18,000	24,000
Long-term frequent flyer liability	18,000	21,000
Other	18,000	1,000
Total other long-term liabilities	$ 97,000	$ 60,000

Commitments and Contingencies -

Commitments and Contingencies - Aircraft and Engine Orders (Details)	1 Months Ended			12 Months Ended
	Nov. 30, 2021 aircraft	Jul. 31, 2021 aircraft	Dec. 31, 2017 aircraft	Dec. 31, 2022 aircraft aircraftEngine
Air Transportation Equipment
Long-term Purchase Commitment [Line Items]
2023				13
2024				33
2025				30
2026				41
2027				42
Thereafter				62
Total				221
Aircraft Engine
Long-term Purchase Commitment [Line Items]
2023 | aircraftEngine				4
2024 | aircraftEngine				2
2025 | aircraftEngine				4
2026 | aircraftEngine				4
2027 | aircraftEngine				3
Thereafter | aircraftEngine				2
Total | aircraftEngine				19
A320neo | Air Transportation Equipment
Long-term Purchase Commitment [Line Items]
2023				0
2024				0
2025				17
2026				19
2027				21
Thereafter				10
Total			67	67
A321neo | Air Transportation Equipment
Long-term Purchase Commitment [Line Items]
2023				13
2024				33
2025				13
2026				22
2027				21
Thereafter				52
Total	91	10	63	154

Commitments and Contingencies_2

Commitments and Contingencies - Additional Information (Details) $ in Millions	1 Months Ended				12 Months Ended
	Nov. 30, 2022 USD ($)	Nov. 30, 2021 aircraft	Jul. 31, 2021 aircraft	Dec. 31, 2017 aircraft	Dec. 31, 2022 USD ($) aircraft employeeGroup	Dec. 31, 2021 USD ($)	Oct. 31, 2019 aircraft
Long-term Purchase Commitment [Line Items]
Purchase commitments for aircraft and engines, 2023					$ 760
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					$ 3,758
Fine paid related to settlement with DOT	$ 1
Number of union-represented employee groups | employeeGroup					7
Amount of employees represented by unions					87%
Accrued liabilities for health care claims					$ 5	$ 5
Air Transportation Equipment
Long-term Purchase Commitment [Line Items]
Number of aircraft agreed to purchase | aircraft					221
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	10	63	154
Number of leasing partners with signed letter of intent | aircraft			2

Commitments and Contingencies_3

Commitments and Contingencies - Collective Bargaining Agreements (Details)	12 Months Ended
	Dec. 31, 2022
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	52%
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%

Stockholders_ Equity (Details)

Stockholders’ Equity (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) votePerShare $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance (in shares) | shares	750,000,000
Preferred stock authorized for issuance (in shares) | shares			10,000,000
Common stock, stated par (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.001
Common stock outstanding (in shares) | shares	217,875,890	217,065,096
Number of votes per share of common stock | votePerShare	1
Dividends declared (in dollars per share) | $ / shares	$ 0	$ 0	$ 0
Dividends paid, vested share-based awards | $	$ 1	$ 1	$ 1
Dividends payable | $	$ 0	$ 1
Nonvoting Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance (in shares) | shares		150,000,000
Common stock, stated par (in dollars per share) | $ / shares	$ 0.001

Net Earnings (Loss) per Share_2

Net Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic:
Net income (loss)	$ (37,000)	$ (102,000)	$ (225,000)
Less: net income attributable to participating rights	0	0	0
Net income (loss) attributable to common stockholders	$ (37,000)	$ (102,000)	$ (225,000)
Weighted average common shares outstanding, basic (in shares)	217,601,373	211,436,542	199,260,410
Net earnings (loss) per share, basic (in dollars per share)	$ (0.17)	$ (0.48)	$ (1.13)
Diluted:
Less: net income attributable to participating rights	$ 0	$ 0	$ 0
Net income (loss) attributable to common stockholders	$ (37,000)	$ (102,000)	$ (225,000)
Effect of dilutive potential common shares (in shares)	0	0	0
Weighted average common shares outstanding, diluted (in shares)	217,601,373	211,436,542	199,260,410
Net earnings (loss) per share, diluted (in dollars per share)	$ (0.17)	$ (0.48)	$ (1.13)

Income Taxes - Components of In

Income Taxes - Components of Income Tax Expense from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Current:
Federal	$ 0	$ (10)	$ (134)
State and local	0	0	1
Current income tax expense (benefit)	0	(10)	(133)
Deferred:
Federal	(7)	(32)	(5)
State and local	(1)	(1)	(9)
Foreign	0	1	0
Deferred income taxes	(8)	(32)	(14)
Total income tax expense (benefit)	$ (8)	$ (42)	$ (147)

Income Taxes - Components of Ef

Income Taxes - Components of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
U.S. federal statutory income tax rate	21%	21%	21%
State taxes, net of federal benefit	1.70%	1.60%	2.10%
Excess tax benefits of stock-based compensation	1.20%	5.20%	0%
Reserves for uncertain tax positions, net	0.60%	6.20%	(0.20%)
Nondeductible warrants	0%	(3.50%)	(0.50%)
Impact of the CARES Act	0%	0%	16.90%
Executive compensation limitation	(3.90%)	(0.50%)	0%
Return to provision adjustment	(2.90%)	0%	0%
Other	0.10%	(0.80%)	0.20%
Effective income tax rate	17.80%	29.20%	39.50%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Cash payments for income taxes, net of refunds	$ 1,000	$ (158,000)	$ 9,000
Deferred tax assets related to state net operating losses	11,000
Deferred tax assets related to federal net operating losses	32,000
Deferred tax assets related to foreign net operating losses	7,000
Valuation allowance	8,000	8,000
Amount of unrecognized benefit that if recognized, would reduce income tax expense	1,000
Amount related to interest and penalties	1,000	$ 1,000	$ 1,000
Foreign Tax Authority
Income Tax Contingency [Line Items]
Valuation allowance	7,000
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Valuation allowance	$ 1,000

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Operating lease liability	$ 568	$ 551
Net operating losses	50	47
Nondeductible accruals	42	32
Deferred revenue	14	12
Income tax credits	1	2
Valuation allowance	8	8
Other	10	10
Deferred tax assets	677	646
Deferred tax liabilities:
Right-of-use asset	(559)	(545)
Property and equipment	(41)	(36)
Maintenance deposits	(24)	(22)
Intangibles	(6)	(6)
Other	(14)	(12)
Deferred tax liabilities	(644)	(621)
Deferred tax assets	$ 33	$ 25

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 1	$ 10	$ 9
Decrease for tax positions taken during prior period	0	(9)	0
Increase for tax positions taken during current period	0	0	1
Ending balance	$ 1	$ 1	$ 10

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Amounts and Estimated Fair Values of the Company’s Debt (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	$ 431	$ 423
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	412	422
Pre-delivery credit facility | Carrying Value | Secured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	277	174
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	277	175
Treasury Loan | Carrying Value | Secured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	0	150
Treasury Loan | Estimated Fair Value | Secured Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, fair value	0	156
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	18
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	19
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	52	58
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	71	15
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	$ 66	$ 14

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
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	$ 761,000	$ 918,000
Other current assets	24,000
Fair Value, Recurring | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	761,000	918,000
Other current assets	0
Fair Value, Recurring | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
Other current assets	24,000
Fair Value, Recurring | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	$ 0
Other current assets	$ 0

Related Parties (Details)

Related Parties (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) director	Dec. 31, 2021 USD ($)	Dec. 31, 2020 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	18%
Indigo Partners | Affiliated Entity
Related Party Transaction [Line Items]
Management fees, expense reimbursements, and director compensation | $	$ 2	$ 2	$ 2
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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Transaction and merger-related costs, net	$ 10	$ 0	$ 0
Spirit Airlines, Inc Merger
Business Acquisition [Line Items]
Merger-related expenses upon termination of agreement	(25)
Termination fee	69
Legal, Accounting and Other Fees | Spirit Airlines, Inc Merger
Business Acquisition [Line Items]
Transaction and merger-related costs, net	16
Retention Bonus | Spirit Airlines, Inc Merger
Business Acquisition [Line Items]
Transaction and merger-related costs, net	$ 19
Employee Retention Costs | Spirit Airlines, Inc Merger
Business Acquisition [Line Items]
Acceleration of merger retention costs	50%