Allegiant Travel (ALGT) 10-K 1 Mar 21 2020 FY Annual report Financial data

Cover Page

Cover Page - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Feb. 12, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	001-33166
Entity Registrant Name	Allegiant Travel Co
Entity Central Index Key	0001362468
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Incorporation, State or Country Code	NV
Entity Tax Identification Number	20-4745737
Entity Address, Address Line One	1201 North Town Center Drive
Entity Address, City or Town	Las Vegas,
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89144
City Area Code	702
Local Phone Number	851-7300
Title of 12(b) Security	Common Stock, $0.001 Par Value
Trading Symbol	ALGT
Security Exchange Name	NASDAQ
Entity Well Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Public Float			$ 1.4
Entity Common Stock, Shares Outstanding		16,415,957
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Documents Incorporated by Reference	Portions of the Proxy Statement to be used in connection with the solicitation of proxies to be voted at the registrant’s annual meeting to be held on June 23, 2021, and to be filed with the Commission subsequent to the date hereof, are incorporated by reference into Part III of this Report on Form 10-K.
Entity Emerging Growth Company	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS
Cash and cash equivalents	$ 152,764	$ 121,888
Restricted cash	17,555	14,897
Short-term investments	532,477	335,928
Accounts receivable	192,215	25,516
Expendable parts, supplies and fuel, net of reserve of $4,323 and $2,748	24,006	28,375
Prepaid expenses and other current assets	24,616	35,617
TOTAL CURRENT ASSETS	943,633	562,221
Property and equipment (including $187,166 and $195,796 from VIEs, Note 7), net of accumulated depreciation of $598,546 and $484,510	2,050,311	2,236,808
Long-term investments	0	15,542
Deferred major maintenance, net of accumulated amortization of $57,022 and $34,423	127,463	129,654
Operating lease right-of-use assets, net	115,911	22,081
Deposits and other assets	21,607	44,497
TOTAL ASSETS:	3,258,925	3,010,803
CURRENT LIABILITIES
Accounts payable	34,197	27,667
Accrued liabilities	116,093	159,031
Current operating lease liabilities	14,313	2,662
Air traffic liability	307,508	249,950
Current maturities of long-term debt and finance lease obligations (including $17,610 and $17,327 from VIEs, Note 7), net of related costs of $7,527 and $5,694	217,234	173,274
TOTAL CURRENT LIABILITIES	689,345	612,584
LONG-TERM DEBT AND OTHER NONCURRENT LIABILITIES
Long-term debt and finance lease obligations (including $135,683 and $159,324 from VIEs, Note 7), net of current maturities and related costs of $15,926 and $17,930	1,441,777	1,248,579
Deferred income taxes	301,763	232,520
Noncurrent operating lease liabilities	102,289	21,290
Other noncurrent liabilities	24,388	12,279
TOTAL LIABILITIES:	2,559,562	2,127,252
SHAREHOLDERS' EQUITY
Common stock, par value $.001, 100,000,000 shares authorized; 23,097,737 and 22,835,715 shares issued; 16,405,565 and 16,303,262 shares outstanding in 2020 and 2019 respectively	23	23
Treasury shares, at cost, 6,692,172 and 6,532,453 shares in 2020 and 2019, respectively	(646,008)	(617,579)
Additional paid in capital	329,753	289,933
Accumulated other comprehensive gain (loss), net	(27)	98
Retained earnings	1,015,622	1,211,076
TOTAL EQUITY:	699,363	883,551
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY:	$ 3,258,925	$ 3,010,803

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Expendable parts, supplies and fuel, net of reserve of $4,323 and $2,748	$ 4,323	$ 2,748
Property and equipment (including $187,166 and $195,796 from VIEs, Note 7), net of accumulated depreciation of $598,546 and $484,510	598,546	484,510
PP&E from VIEs	3,258,925	3,010,803
Deferred major maintenance, net of accumulated amortization of $57,022 and $34,423	57,022	34,423
Current maturities of long-term debt and finance lease obligations (including $17,610 and $17,327 from VIEs, Note 7), net of related costs of $7,527 and $5,694	7,527	5,694
Current maturities of notes payable, from VIEs	689,345	612,584
Long-term debt and finance lease obligations (including $135,683 and $159,324 from VIEs, Note 7), net of current maturities and related costs of $15,926 and $17,930	$ 15,926	$ 17,930
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	23,097,737	22,835,715
Common stock, shares outstanding	16,405,565	16,303,262
Treasury stock, shares	6,692,172	6,532,453
Current maturities of notes payable, from VIEs	$ 689,345	$ 612,584
Variable Interest Entity, Primary Beneficiary [Member]
Statement of Financial Position [Abstract]
PP&E from VIEs	187,166	195,796
Current maturities of notes payable, from VIEs	17,610	17,327
Long-term debt from VIEs	135,683	159,324
Long-term debt from VIEs	135,683	159,324
Current maturities of notes payable, from VIEs	$ 17,610	$ 17,327

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING REVENUES:
Passenger	$ 902,187	$ 1,682,955	$ 1,533,701
Third party products
Third party products	46,482	70,012	58,060
Fixed fee contract	26,865	65,057	50,286
Other	14,539	22,941	25,400
Total operating revenues	990,073	1,840,965	1,667,447
OPERATING EXPENSES:
Aircraft fuel	221,827	427,827	445,814
Salary and benefits	377,825	450,448	413,892
Station operations	144,771	171,420	161,019
Depreciation and amortization	176,267	155,852	129,351
Maintenance and repairs	63,895	91,713	99,015
Sales and marketing	43,517	78,910	73,514
Aircraft lease rentals	9,828	0	868
Other	79,277	100,845	100,515
CARES Act grant recognition	(152,448)	0	0
Special charges	306,299	0	0
Total operating expenses	1,271,058	1,477,015	1,423,988
OPERATING INCOME (LOSS)	(280,985)	363,950	243,459
OTHER (INCOME) EXPENSES:
Interest expense	(60,493)	(76,801)	(56,116)
Interest income	(5,509)	(12,523)	(9,226)
Capitalized interest	(4,067)	(4,472)	(2,354)
Loss on extinguishment of debt	1,222	3,677	0
Special charges	26,632	0	0
Other, net	1,311	780	395
Total other expenses	80,082	62,703	44,141
INCOME (LOSS) BEFORE INCOME TAXES	(361,067)	301,247	199,318
INCOME TAX PROVISION (BENEFIT)	(176,974)	69,130	37,516
NET INCOME (LOSS)	$ (184,093)	$ 232,117	$ 161,802
Earnings (loss) per share to common shareholders:
Basic	$ (11.53)	$ 14.27	$ 10.02
Diluted	$ (11.53)	$ 14.26	$ 10
Shares used for computation:
Basic	15,992	16,027	15,941
Diluted	15,992	16,041	15,967
Cash dividends declared per share:	$ 0.70	$ 2.80	$ 2.80

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	$ (184,093)	$ 232,117	$ 161,802
Other comprehensive income (loss):
Change in available for sale securities, net of tax	(178)	750	(1,153)
Foreign currency translation adjustments	53	9	177
Change in derivatives, net of tax	0	0	3,155
Total other comprehensive income (loss)	(125)	759	2,179
TOTAL COMPREHENSIVE INCOME	$ (184,218)	$ 232,876	$ 163,981

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Treasury Stock
TOTAL EQUITY	$ 553,311		$ 23	$ 253,840	$ (2,840)	$ 907,943		$ 605,655
Common stock, shares issued			16,066,000
Exercises of stock options and stock-settled SARs (Shares)			107,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	17,095			17,095
Stock Repurchased During Period, Shares			(23,000)
Treasury Stock, Value, Acquired, Cost Method	$ (3,650)							(3,650)
Stock Issued During Period, Shares, Employee Stock Purchase Plans	33,300		33,000
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 4,268							4,268
Dividends, Cash	(45,247)					(45,247)
Unrealized gain on short-term investments, net of tax	2,742				2,179	563
Net Income	161,802					161,802
TOTAL EQUITY	690,321		$ 23	270,935	(661)	1,025,061		605,037
Common stock, shares issued			16,183,000
Exercises of stock options and stock-settled SARs (Shares)			213,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	18,998			18,998
Stock Repurchased During Period, Shares			(132,000)
Treasury Stock, Value, Acquired, Cost Method	$ (18,569)							(18,569)
Stock Issued During Period, Shares, Employee Stock Purchase Plans	38,464		39,000
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 6,027							6,027
Dividends, Cash	(45,552)					(45,552)
Unrealized gain on short-term investments, net of tax	759				759
Net Income	232,117					232,117
TOTAL EQUITY	$ 883,551	$ (550)	$ 23	289,933	98	1,211,076	$ (550)	617,579
Common stock, shares issued	16,303,262		16,303,000
Exercises of stock options and stock-settled SARs (Shares)			262,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 38,445			38,445
Stock Repurchased During Period, Shares			(217,000)
Treasury Stock, Value, Acquired, Cost Method	$ (33,773)							(33,773)
Stock Issued During Period, Shares, Employee Stock Purchase Plans	56,866		57,000
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 5,344							5,344
Dividends, Cash	(11,361)					(11,361)
Unrealized gain on short-term investments, net of tax	(125)				(125)
Net Income	(184,093)					(184,093)
Adjustments to Additional Paid in Capital, Warrant Issued	1,375			1,375
TOTAL EQUITY	$ 699,363		$ 23	$ 329,753	$ (27)	$ 1,015,622		$ 646,008
Common stock, shares issued	16,405,565		16,405,000

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends (per Share)	$ 0.70	$ 2.80	$ 2.80

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING ACTIVITIES:
Net income (loss)	$ (184,093,000)	$ 232,117,000	$ 161,802,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	176,267,000	155,852,000	129,351,000
(Gain)/loss on aircraft and other equipment disposals	(1,811,000)	(8,475,000)	2,360,000
Special charges	292,790,000	0	0
Share-based compensation expense	19,287,000	18,226,000	15,098,000
Deferred income taxes	69,344,000	68,466,000	38,222,000
Other adjustments	19,136,000	5,521,000	4,541,000
Changes in certain assets and liabilities:
Accounts receivable	4,390,000	10,498,000	35,624,000
Tax receivable	(164,585,000)	0	0
Prepaid expenses	10,224,000	(5,483,000)	(5,191,000)
Accounts payable	7,016,000	(2,103,000)	8,633,000
Accrued liabilities	(26,386,000)	21,331,000	12,005,000
Air traffic liability	57,558,000	37,720,000	7,931,000
Deferred major maintenance	40,352,000	81,133,000	49,622,000
Other assets/liabilities	(4,163,000)	(10,327,000)	(4,142,000)
Net cash provided by operating activities	234,622,000	442,210,000	356,612,000
INVESTING ACTIVITIES:
Purchase of investment securities	(686,600,000)	(436,237,000)	(371,461,000)
Proceeds from maturity and sale of investment securities	504,600,000	454,813,000	436,581,000
Purchase of property and equipment, including capitalized interest	(281,159,000)	(506,845,000)	(334,774,000)
Proceeds from sale-leaseback transactions	87,580,000	0	0
Other investing activities	9,888,000	11,806,000	677,000
Net cash used in investing activities	(365,691,000)	(476,463,000)	(268,977,000)
FINANCING ACTIVITIES:
Cash dividends paid to shareholders(1)	(11,361,000)	(45,552,000)	(45,247,000)
Proceeds from the issuance of debt	427,987,000	874,936,000	211,225,000
Repurchase of common stock	(33,773,000)	(18,569,000)	(3,650,000)
Principal payments on debt and finance lease obligations	(217,766,000)	(705,763,000)	(232,227,000)
Debt issuance costs	(7,203,000)	(33,333,000)	(1,666,000)
Other financing activities	6,719,000	3,408,000	9,202,000
Net cash provided by (used in) financing activities	164,603,000	75,127,000	(62,363,000)
NET CHANGE IN CASH, CASH EQUIVALENTS, AND RESTRICTED CASH	33,534,000	40,874,000	25,272,000
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	136,785,000	95,911,000	70,639,000
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	170,319,000	136,785,000	95,911,000
CASH PAYMENTS/(RECEIPTS) FOR:
Interest paid, net of amount capitalized	48,002,000	65,152,000	52,323,000
Income tax refunds	(95,229,000)	(2,157,000)	(41,610,000)
Right-of-use (ROU) assets acquired	115,082,000	2,510,000	0
Property capitalized under operating leases	19,294,000	25,830,000	0
Flight equipment acquired under finance leases	$ 27,765,000	$ 0	$ 127,625,000

Organization and Business of Co

Organization and Business of Company (Notes)	12 Months Ended
	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business of Company	Organization and Business of Company Allegiant Travel Company (the “Company”) is a leisure travel company focused on providing travel services and products to residents of under-served cities in the United States. The Company operates a low-cost, low utilization passenger airline which sells air transportation both on a stand-alone basis and bundled with the sale of ancillary air-related and third party services and products. The Company also provides air transportation under fixed fee flying arrangements, generates other ancillary revenues, and operates non-airline related entities which include the development of Sunseeker Resort and related golf course, and Teesnap golf course management solution. Previously, the Company also operated Allegiant Nonstop family entertainment centers.

Unusual or Infrequently Occurri

Unusual or Infrequently Occurring Items	12 Months Ended
	Dec. 31, 2020
Unusual or Infrequent Items, or Both [Abstract]
Unusual or Infrequent Items, or Both, Disclosure	Impact of the COVID-19 Pandemic The rapid spread of COVID-19 and the related government restrictions, social distancing measures, and consumer fears have impacted flight loads, resulted in unprecedented cancellations of bookings and substantially reduced demand for new bookings throughout the airline industry. Starting in March 2020, the Company experienced a severe reduction in air travel, which continued through the remainder of 2020. Demand in the foreseeable future will continue to be affected by fluctuations in COVID-19 cases, hospitalizations, deaths, treatment efficacy and the effectiveness and availability of vaccines. The Company is continuously reevaluating flight schedules and adjusting capacity based on demand trends. The Coronavirus Aid, Relief and Economic Security Act (the "CARES Act") was enacted in March 2020, providing support for the airline industry and other businesses and individuals. On April 20, 2020, the Company through its airline operating subsidiary Allegiant Air, LLC entered into a Payroll Support Program Agreement (the “PSPA”) with the U.S. Department of the Treasury ("Treasury") for an award Allegiant Air would receive under the CARES Act. Allegiant Air received a total of $176.9 million under the PSPA during 2020. The proceeds of the award were used exclusively for wages, salaries and benefits during the second and third quarters of 2020, in accordance with the agreement. The $176.9 million received under the PSPA during the second and third quarters of 2020 includes direct grants of $153.8 million, a $23.1 million loan, and warrants to purchase 27,681 shares of the Company's common stock with a fair value of $1.4 million, as further discussed below. In consideration for the grant, Allegiant Air issued to Treasury a low-interest rate, senior unsecured term promissory note (the “PSP Note”) which will mature 10 years after issuance. The principal amount of the PSP Note is $23.1 million. The PSP Note is guaranteed by the Company and is prepayable at any time at par (see Note 7). Also in consideration for the grant, the Company issued warrants (the “PSP Warrants”) to Treasury to purchase 27,681 shares of common stock of the Company at a price of $83.33 per share (based on the closing price of the Company’s common stock on The Nasdaq Global Select Market on April 9, 2020). The PSP Warrants expire five years after issuance, and will be exercisable either through net share settlement or cash, at the Company’s option. The PSP Warrants include customary anti-dilution provisions, do not have any voting rights and are freely transferable, with registration rights. As indicated above, the Company made significant progress on strengthening its liquidity through efforts including suspending all stock buybacks and dividends; temporarily reducing executives salaries by 50 percent and temporarily foregoing cash compensation of Board members; enacting a hiring freeze and offering voluntary leave; eliminating cash bonuses; suspending all non-essential capital expenditures including, but not limited to, Sunseeker Resorts, Teesnap and Allegiant Nonstop family entertainment centers; and extending payment terms and renegotiating contracts with vendors. On December 27, 2020, the Consolidated Appropriations Act, 2021 (the "Payroll Support Program Extension") was signed into law. This Payroll Support Program Extension provides an additional $15.0 billion in support to the airline industry. See Note 18 - Subsequent Events. Given the above actions and the Company's assumptions about the future impact of COVID-19 on travel demand, which could be materially different due to the inherent uncertainties of the current operating environment, the Company expects to meet its cash obligations as well as remain in compliance with the debt covenants in its existing financing agreements for the next 12 months based on its current level of unrestricted cash and short-term investments, its anticipated access to liquidity, and projected cash flows from operations. Special Charges The effects of COVID-19 triggered an impairment review, and non-cash impairment charges were recognized during the year ended December 31, 2020 (see Note 17 - Impairment for additional detail). The Company also identified expenses that were unique and specific to COVID-19. The impairment charges and other expenses that resulted from the effects of COVID-19 are recorded as special charges within both operating and non-operating expenses during the twelve months ended December 31, 2020. See the table below for a summary of operating and non-operating special charges recorded by segment during the year ended December 31, 2020. (in thousands) Airline Sunseeker Resort Other non-airline Total Year Ended December 31, 2020 Operating $ 141,713 $ 137,994 $ 26,592 $ 306,299 Non-operating — 26,632 — 26,632 Total special charges $ 141,713 $ 164,626 $ 26,592 $ 332,931 Additional detail for the $332.9 million total special charges (operating and non-operating) for the year ended December 31, 2020 appears below: Operating – $161.6 million in impairment charges – Includes Airline - $5.0 million; Sunseeker Resort - $128.9 million; Kingsway - $1.1 million; Other non-airline $26.6 million – $98.0 million adjustment resulting from the accelerated retirements of eight airframes and five engines, loss on sale leaseback transactions of eight aircraft, and write-offs of other aircraft related assets – $35.1 million adjustment for additional salary and benefits expense in relation to the elimination of positions as well as other non-recurring compensation expense associated with the acceleration of certain existing stock awards – Includes Airline - $32.1 million; Sunseeker Resort - $2.9 million – $5.0 million related to suspension of construction at Sunseeker Resort – $6.6 million write-down on various non-aircraft assets and other various expenses Non-operating
Restructuring and Related Activities Disclosure	Special Charges The effects of COVID-19 triggered an impairment review, and non-cash impairment charges were recognized during the year ended December 31, 2020 (see Note 17 - Impairment for additional detail). The Company also identified expenses that were unique and specific to COVID-19. The impairment charges and other expenses that resulted from the effects of COVID-19 are recorded as special charges within both operating and non-operating expenses during the twelve months ended December 31, 2020. See the table below for a summary of operating and non-operating special charges recorded by segment during the year ended December 31, 2020. (in thousands) Airline Sunseeker Resort Other non-airline Total Year Ended December 31, 2020 Operating $ 141,713 $ 137,994 $ 26,592 $ 306,299 Non-operating — 26,632 — 26,632 Total special charges $ 141,713 $ 164,626 $ 26,592 $ 332,931 Additional detail for the $332.9 million total special charges (operating and non-operating) for the year ended December 31, 2020 appears below: Operating – $161.6 million in impairment charges – Includes Airline - $5.0 million; Sunseeker Resort - $128.9 million; Kingsway - $1.1 million; Other non-airline $26.6 million – $98.0 million adjustment resulting from the accelerated retirements of eight airframes and five engines, loss on sale leaseback transactions of eight aircraft, and write-offs of other aircraft related assets – $35.1 million adjustment for additional salary and benefits expense in relation to the elimination of positions as well as other non-recurring compensation expense associated with the acceleration of certain existing stock awards – Includes Airline - $32.1 million; Sunseeker Resort - $2.9 million – $5.0 million related to suspension of construction at Sunseeker Resort – $6.6 million write-down on various non-aircraft assets and other various expenses Non-operating

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying consolidated financial statements include the accounts of Allegiant Travel Company and its majority-owned operating subsidiaries. The Company's investments in unconsolidated affiliates, which are 50 percent or less owned, are accounted for under the equity or cost method. All intercompany balances and transactions have been eliminated. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results could differ from these estimates. The Company adopted Accounting Standards Update (ASU) 2016-02, Leases (Topic 842), (the "New Lease Standard") effective January 1, 2019 using the modified retrospective transition approach. Under this method, the cumulative effect adjustment to the opening balance of retained earnings was recognized at the adoption date. As a result, the Company was not required to adjust its comparative period financial information for effects of the standard or make the new required lease disclosures for periods before the date of adoption on January 1, 2019. See Recent Accounting Pronouncements below for further information. The Company adopted Accounting Standards Update (ASU) 2016-13, Measurement of Credit Losses on Financial Instruments (Topic 326) effective January 1, 2020. The standard requires the use of an “expected loss” model on certain types of financial instruments. The standard also amends the impairment model for available-for-sale debt securities and requires estimated credit losses to be recorded as allowances instead of reductions to amortized cost of the securities. The Company adopted this accounting standard prospectively as of January 1, 2020 and it did not have a significant impact on its consolidated financial statements. Cash and Cash Equivalents Cash and cash equivalents include investments and interest bearing instruments with maturities of three months or less at the balance sheet date. Such investments are carried at cost which approximates fair value. Restricted Cash Restricted cash represents escrowed funds under fixed fee contracts, and cash collateral held against letters of credit required by hotel properties for guaranteed room availability, airports and certain other parties. Accounts Receivable Accounts receivable are carried at face amount which approximates fair value. In addition to income tax receivables, the accounts receivable consist primarily of amounts due from credit card companies associated with the sale of tickets for future travel. These receivables are short-term and generally settle within a few days of sale. There are also receivables related to commission amounts due from Enterprise Holdings Inc. based on terms in the rental car provider agreement and amounts due related to fixed fee charter agreements. If deemed necessary, the Company records charges to its allowance for doubtful accounts for amounts not expected to be collected, for which the balance was immaterial for all years presented. The Company also had outstanding receivables from a third party as of December 31, 2020 and 2019, of which $10.9 million and $11.4 million, respectively, was due more than one year after the balance sheet date and is classified with the Company's other assets. Short-term and Long-term Investments The Company’s investments in marketable securities are classified as available-for-sale and are reported at fair value with the net unrealized gain or (loss) reported as a component of accumulated other comprehensive income (loss) in shareholders’ equity. For investments in an unrealized loss position, the Company determines whether a credit loss exists by considering information about the collectability of the instrument and current market conditions. There have been no credit losses. Investment securities with original maturities of three months or less are classified as cash equivalents. Investment securities with original maturities greater than three months are classified as either short-term investments or long-term investments based on the maturity date in relation to the balance sheet date. Short-term investments have a maturity date less than or equal to one year from the balance sheet date, and long-term investments have a maturity date greater than one year from the balance sheet date. As of December 31, 2019, the Company’s long-term investments consisted of corporate debt securities, federal agency debt securities, US Treasury Bonds, and municipal debt securities with contractual maturities of less than 24 months. The amortized cost of investment securities sold is determined by the specific identification method with any realized gains or losses reflected in other (income) expense. The Company had minimal realized losses during the years ended December 31, 2020, 2019, and 2018. The Company believes unrealized losses related to debt securities are not other-than-temporary and does not intend to sell these securities prior to amortized cost recoverability. The Company attempts to minimize its concentration risk with regard to its cash, cash equivalents, and investment portfolio. This is accomplished by diversifying and limiting amounts among different counterparties, the type of investment, and the amount invested in any individual security, commercial paper, or money market fund. Expendable Parts, Supplies and Fuel, Net Expendable parts, supplies and fuel inventories are valued at cost using the first-in, first-out method. Such inventories are charged to expense as they are used in operations. An obsolescence allowance for expendable parts and supplies is based on salvage values and the average remaining useful life of the Airbus fleet. The obsolescence allowance for expendable parts and supplies was $4.3 million and $2.7 million at December 31, 2020 and 2019, respectively. Rotable aircraft parts inventories are included in property and equipment. Operating Lease Right-of-Use Asset and Liability The Company determines if an arrangement is a lease at inception and has lease agreements for aircraft, office facilities, office equipment, certain airport and terminal facilities, and other space and assets with non-cancelable lease terms. Certain real estate and property leases, aircraft leases, and various other operating leases are measured on the balance sheet with a lease liability and right-of-use ("ROU") asset. Airport terminal leases mostly include variable lease payments outside of those based on a fixed index, and are therefore excluded from consideration. ROU assets represent the Company's right to use an underlying asset for the lease term, and lease liabilities represent the obligation to make scheduled lease payments. ROU assets and liabilities are recognized on the lease commencement date based on the present value of lease payments over the lease term. The present value of lease payments is calculated using the incremental borrowing rate at lease commencement, which takes into consideration recent debt issuances as well as other applicable market data available. Lease payments include fixed payments, variable payments based on an index or rate, reasonably certain purchase options, termination penalties, and others as required by the New Lease Standard. Lease payments do not include variable lease payments other than those that depend on an index or rate, any guarantee by the lessee of the lessor’s debt, or any amount allocated to non-lease components. Lease terms include options to extend when it is reasonably certain that the option will be exercised. Leases with a term of 12 months or less are not recorded on the balance sheet. Additionally, lease and non-lease components are accounted for as a single lease component for real estate agreements. Property and Equipment Property and equipment are recorded at cost and depreciated using the straight-line method over their estimated useful lives less any estimated salvage value. Property under finance leases and related obligations are initially recorded at an amount equal to the present value of future minimum lease payments computed on the basis of the Company’s incremental borrowing rate, and depreciation is recorded on a straight-line basis and is included within depreciation and amortization expense. The estimated useful lives of the principal asset classes are shown below. Aircraft, engines and related rotable parts 10-25 years Buildings and leasehold improvements 10-25 years Equipment 3-10 years Computer hardware and software 3-10 years In estimating the useful lives and residual values of aircraft, the Company primarily relies upon actual experience with the same or similar aircraft types, current and projected future market information, and recommendations from other industry sources. Subsequent revisions to these estimates could be caused by changing market prices of the Company’s aircraft, changes in utilization of the aircraft, and other fleet events. These estimates are evaluated each reporting period and adjusted if necessary. Changes in the estimate for useful lives or residual values of the Company’s property and equipment could result in changes in depreciation expense. Interest is capitalized using the Company’s weighted average borrowing rate and depreciated over the estimated useful life of the related asset(s) acquired/developed. Capitalized interest for the years ended December 31, 2020, 2019 and 2018 was $4.1 million, $4.5 million and $2.4 million, respectively. Software Capitalization The Company capitalizes certain internal and external costs related to the acquisition and development of computer software during the application development stage of projects. The Company amortizes these capitalized costs using the straight-line method over the estimated useful life of the software, which typically ranges from three Aircraft Maintenance and Repair Costs The Company accounts for all non-major maintenance and repair costs incurred for its Airbus fleet under the direct expense method. Under this method, maintenance and repair costs for aircraft are charged to operating expenses as incurred. Maintenance and repair costs includes all parts, materials, and line maintenance activities required to maintain the Company's fleet. The Company accounts for major maintenance costs of its Airbus airframes and the related CFM engines using the deferral method. Under this method, the Company capitalizes the cost of major maintenance events, which are amortized as a component of depreciation and amortization expense, over the estimated period until the next scheduled major maintenance event. During 2020 and 2019, the Company capitalized $12.8 million and $64.1 million of major maintenance costs for engines with associated amortization expense of $17.6 million and $11.1 million, respectively. During 2020 and 2019, the Company capitalized $22.6 million and $18.4 million of major maintenance costs for airframes with associated amortization expense of $19.9 million and $14.9 million, respectively. Until the full retirement of the MD-80 aircraft in November 2018, the Company accounted for major maintenance costs of the MD-80 airframes and JT8D-219 engines, as well as all non-major maintenance and repair costs incurred for the MD-80 fleet, under the direct expense method. Measurement of Impairment of Long-Lived Assets The Company records impairment losses on long-lived assets used in operations, consisting principally of property and equipment, when events or changes in circumstances indicate, in management’s judgment, that the assets might be impaired, and the undiscounted future cash flows estimated to be generated by those assets are less than the carrying amount of those assets. In making these determinations, the Company utilizes certain assumptions, including, but not limited to: (i) estimated fair value of the assets; and (ii) estimated future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization, length of service for which the asset will be used in operations, and estimated salvage values. For the year ended December 31, 2020, the Company recorded a $161.6 million impairment as a result of COVID-19. The impairment is more fully discussed in Note 17. For the years ended December 31, 2019 and 2018, the Company did not incur any impairment losses. Revenue Recognition Passenger revenue Passenger revenue includes scheduled service revenue, ancillary air-related charges, and travel point redemptions from the co-branded Allegiant World Mastercard® credit card. Scheduled service revenue consists of ticket revenue generated from nonstop flights in the Company’s route network, recognized either when the transportation is provided or when the itinerary expires unused. Nonrefundable scheduled itineraries expire on the date of the intended flight, unless the date is extended by notification from the customer in advance. Itineraries sold for transportation not yet used, as well as unexpired credits, are included in air traffic liability. Ancillary air-related charges include various unbundled services and products related to the flight such as baggage fees, the use of the Company’s website to purchase scheduled service transportation, advance seat assignments, and other services. Revenues from air-related charges are recognized when the transportation is provided. If a customer cancels a flight, a voucher may be issued for a future flight, at which time the associated revenue is recognized. Additionally, the Company estimates the value of vouchers that will expire unused and recognizes such revenue at the time of issuance. Various taxes and fees, assessed on the sale of tickets to customers, are collected by the Company serving as an agent, and remitted to taxing authorities. These taxes and fees are not included as revenue in the Company’s consolidated statements of income and are recorded as a liability until remitted to the appropriate taxing authority. Revenue from travel point redemptions from the co-branded credit card are described in the Affinity Credit Card Program section below. Third party products revenue Ancillary third party products revenue is generated from the sale of hotel rooms, rental cars and ticket attractions, as well as marketing revenue associated with the co-branded credit card. Revenue from the sale of third party products is recognized at the time the product is utilized, such as the time a purchased hotel room is occupied. The Company follows accounting standards for determining the amount of revenue to be recognized for each element of a bundled sale involving third party products in addition to airfare. Revenue from the sale of third party products is recorded net of amounts paid to wholesale providers, travel agent commissions, and transaction costs. Pursuant to the co-brand arrangement with Bank of America, the Company has various performance obligations which are collectively referred to as the marketing component. These obligations consist of use of the Company’s brand and access to its member lists, and certain other advertising and marketing elements. The marketing component is recorded as third party products revenue in the period in which points are awarded to the credit card holders. Fixed fee contract revenue Fixed fee contract revenue consists of agreements to provide charter service on a year-round and ad hoc basis. Fixed fee contract revenue is recognized when the transportation is provided. Other revenue Other revenue is generated from non-airline activities as well as leasing aircraft and engines. Lease revenue is recognized ratably over the lease term. Affinity Credit Card Program The Allegiant World Mastercard® is issued by Bank of America through which arrangement points are sold and consideration is received under an agreement that was amended in 2020 and expires in 2029. Under this arrangement, the Company identified the following deliverables: travel points to be awarded (the travel component), use of the Company’s brand and access to its member lists, and certain other advertising and marketing elements (collectively the marketing component). Each of these deliverables is accounted for separately and allocation of the consideration from the agreement is determined based on the relative selling price of each deliverable. The Company applied a level of management judgment and estimation in determining the best estimate of selling price for each deliverable by considering multiple inputs and methods including, but not limited to, the redemption value of points awarded, discounted cash flows, brand value, volume discounts, published selling prices, number of points to be awarded and number of points expected to be redeemed. Revenue from the travel component is deferred based on its relative selling price and is recognized into passenger revenue when the points are redeemed by cardholders and transportation is provided. Revenue from the marketing component is considered earned in the period in which points are sold and is therefore recognized into third party products revenue in the same period. Advertising Costs Advertising costs are charged to expense in the period incurred. Advertising expense was $12.4 million, $29.1 million and $28.8 million for the years ended December 31, 2020, 2019 and 2018, respectively. In 2019, the Company entered into a naming rights agreement with the Raiders of the National Football League for the professional football stadium in Las Vegas which opened in 2020. Prepayments and other associated advertising expenses began in mid-2020 and will continue through the term of this agreement. Earnings per Share Basic and diluted earnings per share are computed pursuant to the two-class method as opposed to the treasury method. Under the two-class method, the Company attributes net income to two classes, common stock and unvested restricted stock awards. Unvested restricted stock awards granted to employees under the Company’s Long-Term Incentive Plan are considered participating securities because they receive non-forfeitable rights to cash dividends at the same rate as common stock. Diluted net income per share is calculated using the more dilutive of two methods. Under both methods, the exercise of employee stock options is assumed using the treasury stock method. The assumption of vesting of restricted stock, however, differs as described below: 1. Assume vesting of restricted stock using the treasury stock method. 2. Assume unvested restricted stock awards are not vested, and allocate earnings to common shares and unvested restricted stock awards using the two-class method. For the years ended December 31, 2019 and 2018, the second method above was used in the computation because it was more dilutive than the first method. Given the loss position in 2020, both methods yield the same result. The following table sets forth the computation of net income (loss) per share on a basic and diluted basis for the periods indicated: Year ended December 31, (in thousands, except per share data) 2020 2019 2018 Basic: Net income (loss) $ (184,093) $ 232,117 $ 161,802 Less net income (loss) allocated to participating securities (236) (3,413) (2,106) Net income (loss) attributable to common stock $ (184,329) $ 228,704 $ 159,696 Earnings (loss) per share, basic $ (11.53) $ 14.27 $ 10.02 Weighted-average shares outstanding 15,992 16,027 15,941 Diluted: Net income (loss) $ (184,093) $ 232,117 $ 161,802 Less net income (loss) allocated to participating securities (236) (3,410) (2,104) Net income (loss) attributable to common stock $ (184,329) $ 228,707 $ 159,698 Earnings (loss) per share, diluted $ (11.53) $ 14.26 $ 10.00 Weighted-average shares outstanding 15,992 16,027 15,941 Dilutive effect of stock options and restricted stock — 51 53 Adjusted weighted-average shares outstanding under treasury stock method 15,992 16,078 15,994 Participating securities excluded under two-class method — (37) (27) Adjusted weighted-average shares outstanding under two-class method 15,992 16,041 15,967 Stock awards outstanding of 24,004, 19,928, and 77,037 shares (not in thousands) as of December 31, 2020, 2019, and 2018, respectively, were excluded from the computation of diluted earnings per share as they were antidilutive. Share-Based Compensation The Company accounts for share-based compensation in accordance with accounting standards which require the compensation cost related to share-based payment transactions be recognized in the Company’s consolidated statements of income. The share-based cost is measured based on grant date fair value. The Company’s share-based employee compensation plan is more fully discussed in Note 13. Income Taxes The Company recognizes deferred income taxes based on the asset and liability method required by accounting standards. Deferred tax assets and liabilities are determined based on the timing differences between book basis for financial reporting purposes and tax basis of the asset and liability and measured using the enacted tax rates and provisions of the enacted tax law. A valuation allowance for deferred tax assets is provided if it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company determines the net non-current deferred tax assets or liabilities separately for federal, state, foreign and other local jurisdictions. The Company’s income tax returns are subject to examination by the Internal Revenue Service (“IRS”) and other tax authorities in the jurisdictions where the Company operates. The Company assesses potentially unfavorable outcomes of such examinations based on the criteria set forth in uncertain tax position accounting standards. The accounting standards prescribe a minimum recognition threshold a tax position is required to meet before being recognized in the financial statements. Accounting standards for income taxes utilize a two-step approach for evaluating tax positions. Recognition (Step I) occurs when the Company concludes that a tax position, based on its technical merits, is more likely than not to be sustained upon examination. Measurement (Step II) is only addressed if the position is deemed to be more likely than not to be sustained. Under Step II, the tax benefit is measured as the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement. The tax positions failing to qualify for initial recognition are recognized in the first subsequent interim period they meet the “more likely than not” standard. If it is subsequently determined that a previously recognized tax position no longer meets the “more likely than not” standard, it is required that the tax position be derecognized. As applicable, the Company will recognize accrued penalties and interest related to unrecognized tax benefits in the provision for income taxes. Recent Accounting Pronouncements In February 2016, the FASB issued the New Lease Standard. This standard requires leases, other than short-term, to be recognized on the balance sheet as a liability and a corresponding ROU asset. This standard was effective for interim and annual reporting periods beginning after December 15, 2018 and the Company adopted the New Lease Standard as of January 1, 2019. The Company also elected the package of practical expedients, which among other things, does not require reassessment of lease classification. The Company adopted the New Lease Standard using the modified retrospective transition approach as of the effective date as permitted by the amendments in ASU 2018-11, "Targeted Improvements - Leases (Topic 842)." Under this method, the cumulative effect adjustment to the opening balance of retained earnings was recognized at the adoption date. As a result, the Company was not required to adjust its comparative period financial information for effects of the standard or make the new required lease disclosures for periods before the date of adoption on January 1, 2019. The Company's consolidated balance sheet was affected by this standard, but the consolidated statements of income and cash flows were not significantly impacted. The most significant change to the consolidated balance sheet upon adoption on January 1, 2019 related to the recognition of new right-of-use (ROU) assets of $18.0 million and operating liabilities of $19.1 million. The Company's accounting for finance leases remains substantially unchanged. See Note 7 for more information on the impact of this standard. On June 16, 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments. The standard requires the use of an “expected loss” model on certain types of financial instruments. The standard also amends the impairment model for available-for-sale debt securities and requires estimated credit losses to be recorded as allowances instead of reductions to amortized cost of the securities. The Company adopted this accounting standard prospectively as of January 1, 2020, and it did not have a significant impact on its consolidated financial statements In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This standard is intended to simplify various aspects related to accounting for income taxes and is effective for fiscal years

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition Passenger revenue Passenger revenue is the most significant category in our reported operating revenues, as outlined below: Year Ended December 31, (in thousands) 2020 2019 2018 Scheduled service $ 435,668 $ 897,631 $ 898,653 Ancillary air-related charges 453,545 770,206 621,939 Co-brand redemptions 12,974 15,118 13,109 Total passenger revenue $ 902,187 $ 1,682,955 $ 1,533,701 Sales of passenger tickets not yet flown are recorded in air traffic liability. Passenger revenue is recognized when transportation is provided or when ticket voucher breakage occurs, to the extent different from estimated breakage. As of December 31, 2020, approximately 27.9 percent of the air traffic liability balance was related to forward bookings, with the remaining 72.1 percent related to credit vouchers for future travel. The normal contract term of passenger tickets is 12 months and revenue associated with future travel will principally be recognized within this time frame. $201.0 million of the $250.0 million that was recorded in the air traffic liability balance at December 31, 2019 was recognized into passenger revenue during the 12 months ended December 31, 2020. In April 2020, the Company announced that credits issued for canceled travel in April through the end of the COVID-19 pandemic will have an extended expiration date of two years from the original booking date. The Company later announced that this extension would also apply to credits issued for cancelled travel in January through March 2020. This change has been considered in estimating the future breakage rate, which represents the value of credit vouchers that are not expected to be redeemed prior to their contractual expiration date. Co-brand redemptions In relation to the travel component of the co-branded credit card contract with Bank of America, the Company has a performance obligation to provide cardholders with points to be used for future travel award redemptions. Therefore, consideration received from Bank of America related to the travel component is deferred based on its relative selling price and is recognized into passenger revenue when the points are redeemed and the transportation is provided. The following table presents the activity of the co-brand point liability as of the dates indicated: Year Ended December 31, (in thousands) 2020 2019 Balance at January 1 $ 15,613 $ 10,708 Points awarded 19,202 20,023 Points redeemed (12,974) (15,118) Balance at December 31 $ 21,841 $ 15,613 As of December 31, 2020 and 2019, $10.9 million and $11.6 million, respectively, of the current points liability is reflected in accrued liabilities and represents the current estimate of revenue to be recognized in the next 12 months based on historical trends, with the remaining balance reflected in other noncurrent liabilities and expected to be recognized into revenue in periods thereafter.

Property and Equipment (Notes)

Property and Equipment (Notes)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure	Property and Equipment Property and equipment consisted of the following: As of December 31, (in thousands) 2020 2019 Flight equipment $ 2,331,499 $ 2,289,157 Computer hardware and software 149,727 171,516 Land and buildings/leasehold improvements (1) 87,030 98,885 Other property and equipment 80,601 161,760 Total property and equipment 2,648,857 2,721,318 Less accumulated depreciation and amortization (598,546) (484,510) Property and equipment, net $ 2,050,311 $ 2,236,808 (1) Balance includes a building currently held for sale in Chesterfield, Missouri with a carrying value of $4.8 million As of December 31, 2020, the Company had firm commitments to purchase three Airbus A320 series aircraft which are expected to be delivered between 2021 and 2022.

Accrued Liabilities (Notes)

Accrued Liabilities (Notes)	12 Months Ended
	Dec. 31, 2020
Payables and Accruals [Abstract]
Accounts Payable and Accrued Liabilities Disclosure	Accrued Liabilities Accrued liabilities consisted of the following: As of December 31, (in thousands) 2020 2019 Salaries, wages and benefits $ 21,878 $ 44,441 Sunseeker Resort development 14,084 15,209 Maintenance and repairs 12,847 12,713 Loyalty card program liability 10,929 11,567 Station expenses 10,526 14,573 Property taxes 9,042 12,272 Interest 6,560 6,514 Passenger taxes and fees 4,686 14,653 Advertising accruals 890 3,303 Other accruals 24,651 23,786 Total accrued liabilities $ 116,093 $ 159,031

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt consisted of the following: As of December 31, (in thousands) 2020 2019 Fixed-rate debt and finance lease obligations due through 2030 $ 525,240 $ 235,071 Variable-rate debt due through 2029 1,133,771 1,186,782 Total long-term debt and finance lease obligations, net of related costs 1,659,011 1,421,853 Less current maturities, net of related costs 217,234 173,274 Long-term debt and finance lease obligations, net of current maturities and related costs $ 1,441,777 $ 1,248,579 Weighted average fixed-interest rate on debt 5.7 % 3.7 % Weighted average variable-interest rate on debt 2.4 % 4.5 % Maturities of long-term debt as of December 31, 2020, for the next five years and thereafter, in the aggregate, are: (in thousands) As of December 31, 2020 2021 $ 217,234 2022 137,252 2023 136,781 2024 806,383 2025 89,194 Thereafter 272,167 Total debt and finance lease obligations, net of related costs $ 1,659,011 Total long-term debt is presented net of related costs of $23.5 million and $23.6 million at December 31, 2020 and 2019, respectively. Term Loan and Senior Secured Notes In February 2019, the Company entered into a Credit and Guaranty Agreement (the “Term Loan”) to borrow $450.0 million, guaranteed by all of the Company's subsidiaries, excluding Sunseeker Resorts Inc. and its subsidiaries, and other insignificant subsidiaries (the "Term Loan Guarantors"). In February 2020, the Company entered into an amendment to the Term Loan under which the interest rate was reduced by 150 basis points, and the principal amount of the debt was increased by a net amount of $100.0 million to $545.5 million. Quarterly principal payments increased under the amendment, but the remaining provisions were substantially unchanged, including the maturity date. The Term Loan is secured by substantially all property and assets of the Company and the Term Loan Guarantors, excluding aircraft and aircraft engines, and excluding certain other assets. The Term Loan bears interest based on LIBOR with a zero percent floor and provides for quarterly interest payments along with quarterly principal payments of $1.4 million through February 2024, at which time the Term Loan is due. The Term Loan may be prepaid at any time without penalty. In October 2020, the Company closed on the private offering of $150.0 million principal amount of 8.5 percent Senior Secured Notes due 2024 (the "Senior Secured Notes"). The Senior Secured Notes and related guarantees are secured by first priority security interests in the same collateral package as securing the Term Loan and the debt is subject to an Intercreditor Agreement with the collateral agent for the Term Loan.The guarantors of the Notes include all significant subsidiaries other than Sunseeker Resorts, Inc. and its subsidiaries. Consolidated Variable Interest Entities The Company evaluates ownership, contractual lease arrangements and other interests in entities to determine if they are variable interest entities ("VIEs") based on the nature and extent of those interests. The Company consolidates a VIE when, among other criteria, it has the power to direct the activities that most significantly impact the VIE’s economic performance as well as the obligation to absorb losses or the right to receive benefits of the VIE, thus making the Company the primary beneficiary of the VIE. In October 2019, the Company, through a wholly owned subsidiary, entered into agreements with a trust to borrow $23.5 million secured by one Airbus A320 series aircraft. The trust was funded on inception. The borrowing bears interest at a blended rate of 3.2 percent and is payable in monthly installments through October 2024, at which time the Company will have a purchase option at a fixed amount. As this transaction is a common control transaction, the Company, as the primary beneficiary, has measured and recorded the assets and liabilities at their carrying values, which were $18.6 million and $23.5 million, respectively, at the time of borrowing. In March 2019, the Company, through a wholly owned subsidiary, entered into agreements with a trust to borrow $44.0 million secured by one aircraft. The trust was funded on inception. The borrowing bears interest at a blended rate of 3.8 percent and is payable in quarterly installments through April 2029, at which time the Company will have a purchase option at a fixed amount. As this transaction is a common control transaction, the Company, as the primary beneficiary, has measured and recorded the assets and liabilities at their carrying values, which were $38.5 million and $44.0 million, respectively, at the time of borrowing. In September 2018, the Company, through a wholly owned subsidiary, entered into agreements with a trust to borrow $44.0 million secured by one Airbus A320 series aircraft. The trust was funded on inception. The borrowing bears interest at a blended rate of 4.0 percent and is payable in quarterly installments through September 2028, at which time the Company will have a purchase option at a fixed amount. As this transaction is a common control transaction, the Company, as the primary beneficiary, has measured and recorded the assets and liabilities at their carrying values, which were $37.8 million and $44.0 million, respectively, at the time of borrowing. CARES Act Payroll Support Program Loan In April 2020 the Company entered into a low-interest rate, senior unsecured term promissory note (the "PSP" Note) with the Treasury under the CARES Act payroll support program. The Note matures in full on April 20, 2030, and bears interest at a rate of 1.0 percent per annum prior to April 20, 2025 and, thereafter, at the secured overnight financing rate (SOFR) plus 2 percent. The PSP Note is prepayable at any time at par, without penalty. During 2020, the Company received $23.1 million in funds under the PSP Note, which is recorded within noncurrent debt on the balance sheet. In connection with the PSP Note, the Company is required to comply with the relevant provisions of the CARES Act, including those prohibiting the repurchase of common stock and the payment of common stock dividends until September 30, 2021, as well as those restricting the payment of certain executive compensation for periods through March 24, 2022. These restrictions have been extended until March 31, 2022 with respect to stock repurchases and payment of dividends and until October 1, 2022 with respect to executive compensation limits as a result of the Payroll Support Extension Program. Senior Secured Revolving Credit Facility The Company has a senior secured revolving credit facility under which it is entitled to borrow up to $81.0 million. The facility has a term of 24 months and the borrowing ability is based on the value of the Airbus A320 series aircraft placed in the collateral pool. In December 2019, the Company drew down $81.0 million under this facility. Principal payments were made during 2020 totaling $27.1 million, and the remaining balance as of December 31, 2020 is $53.9 million. Aircraft remain in the collateral pool for up to two years, and, as of December 31, 2020, there were six aircraft in the pool. The notes for the amounts borrowed under the facility bear interest at a floating rate based on LIBOR and are due in March 2021. Other Secured Debt In September 2020, the Company borrowed $84.0 million under a loan agreement secured by aircraft and spare engines. The note bears interest at a fixed rate, payable in monthly installments maturing in September 2025 and September 2026 for the spare engines and aircraft, respectively. In April 2020, the Company borrowed $31.0 million under a loan agreement secured by two aircraft. The note bears interest at a fixed rate, payable in quarterly installments with a maturity date in April 2028. General Unsecured Notes In connection with the Term Loan discussed above, the Company completed a tender offer in February 2019, whereby it purchased $347.9 million of its previously outstanding unsecured notes due July 2019, and incurred related debt extinguishment costs of $3.7 million. The remaining $102.1 million of the unsecured notes were paid at their maturity in July 2019. Construction Loan Agreement In March 2019, Sunseeker Florida, Inc. (“SFI”), a wholly owned subsidiary of the Company, entered into a Construction Loan Agreement with certain lenders affiliated with TPG Sixth Street Partners, LLC (the “Lender”). Under the Construction Loan Agreement, SFI would have been able to borrow up to $175.0 million (the “Loan”) to fund the construction of Phase 1 of Sunseeker Resort - Charlotte Harbor. No amount was ever drawn under this agreement. Due to the various impacts of COVID-19, the Company suspended construction of Sunseeker Resort, and it is uncertain when construction will resume. In light of these conditions, the Company reached a $19.8 million settlement agreement with the Lender to terminate the Loan which was fully paid in 2020. The expense is reflected within non-operating special charges on the statement of income. Finance Leases The Company has finance lease obligations related to six aircraft, which impacted the Company's recognized assets and liabilities as of December 31, 2020. See Note 8 for more information on finance lease obligations.

Lease (Notes)

Lease (Notes)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Lessee, Operating Leases [Text Block]	Leases Total rental expense for operating leases for the years ended December 31, 2020, 2019 and 2018 was $24.6 million, $15.0 million and $12.7 million, respectively. The Company had six aircraft under finance leases as of December 31, 2020 with remaining terms through 2029. Lease Costs The components of lease costs recognized on the statements of income were as follows: Year Ended December 31, (in thousands) Classification on the Statements of Income 2020 2019 Finance lease costs: Amortization of assets Depreciation and amortization $ 6,631 $ 6,517 Interest on lease liabilities Interest expense 5,335 5,264 Operating lease cost Aircraft lease rentals; Station operations; Maintenance and repairs; Other operating expense 12,616 3,541 Variable lease cost Station operations; Maintenance and repairs; Other operating expense 3,560 2,274 Total lease cost $ 28,142 $ 17,596 Lease position as of December 31, 2020 The table below presents the lease-related assets and liabilities recorded on the balance sheet. As of December 31, (in thousands) Classification on the Balance Sheet 2020 2019 Assets Operating lease assets Operating lease right-of-use assets, net $ 115,911 $ 22,081 Finance lease assets Property and equipment, net 133,175 111,665 Total lease assets $ 249,086 $ 133,746 Liabilities Current Operating Current operating lease liabilities $ 14,313 $ 2,662 Finance Current maturities of long-term debt and finance lease obligations 9,767 7,666 Noncurrent Operating Noncurrent operating lease liabilities 102,289 21,290 Finance Long-term debt and finance lease obligations 117,060 107,930 Total lease liabilities $ 243,429 $ 139,548 Weighted-average remaining lease term Operating leases 8.3 years 9.1 years Finance leases 7.6 years 9.9 years Weighted-average discount rate Operating leases 5.4 % 4.3 % Finance leases 5.0 % 4.4 % Sale-Leaseback Transactions During the year ended December 31, 2020, the Company entered into sale-leaseback transactions involving eight total aircraft. The transactions qualified as sales, and generated $87.6 million of proceeds. As a result of the sales, the aircraft were removed from property and equipment in the Company's balance sheet, resulting in a $53.2 million loss on the sales. The loss is reflected within operating special charges on the statement of income since the Company would not likely have completed the transactions absent cash conservation efforts as a result of COVID-19. The leased aircraft were subsequently recorded within operating lease right-of-use assets, with the related lease liabilities recorded within current and noncurrent operating lease liabilities on the balance sheet. The proceeds from the sales of aircraft in these transactions are treated as cash inflows from investing activities on the statement of cash flows. Other Information The table below presents supplemental cash flow information related to leases during the year ended December 31. Year Ended December 31, (in thousands) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 13,102 $ 2,927 Operating cash flows for finance leases $ 5,335 5,264 Financing cash flows for finance leases 15,908 7,336 Maturities of Lease Liabilities The table below indicates the future minimum payments of lease liabilities as of December 31, 2020. (in thousands) Operating Leases Finance Leases 2021 $ 20,055 $ 15,871 2022 20,313 14,366 2023 20,160 26,045 2024 19,853 10,500 2025 17,723 10,500 Thereafter 44,486 82,458 Total lease payments 142,590 159,740 Less imputed interest (25,988) (32,913) Total lease obligations 116,602 126,827 Less current obligations (14,313) (9,767) Long-term lease obligations $ 102,289 $ 117,060
Sale Leaseback Transactions	Sale-Leaseback Transactions During the year ended December 31, 2020, the Company entered into sale-leaseback transactions involving eight total aircraft. The transactions qualified as sales, and generated $87.6 million of proceeds. As a result of the sales, the aircraft were removed from property and equipment in the Company's balance sheet, resulting in a $53.2 million loss on the sales. The loss is reflected within operating special charges on the statement of income since the Company would not likely have completed the transactions absent cash conservation efforts as a result of COVID-19. The leased aircraft were subsequently recorded within operating lease right-of-use assets, with the related lease liabilities recorded within current and noncurrent operating lease liabilities on the balance sheet. The proceeds from the sales of aircraft in these transactions are treated as cash inflows from investing activities on the statement of cash flows.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2020
Equity [Abstract]
Stockholders' Equity	Shareholders’ Equity The Company is authorized by its Board of Directors to acquire the Company’s stock through open market purchases under its share repurchase program. As repurchase authority is exhausted, the Board of Directors has, to date, authorized additional expenditures for share repurchases. The Company suspended stock repurchases upon the onset of the pandemic and as part of accepting benefits from the Treasury under the PSPA and PSP2, the Company has agreed not to repurchase stock through March 31, 2022. Share repurchases consisted of the following during the periods indicated: Year Ended December 31, 2020 2019 2018 Shares repurchased (1) 197,570 103,943 — Average price per share $ 155.14 $ 141.64 NA Total (in thousands) $ 30,651 $ 14,723 $ — (1) Share amounts shown above include only open market repurchases and do not include shares withheld from employees for tax withholding obligations related to restricted stock vestings, which were 19,001, 27,700 and 22,981 shares for 2020, 2019 and 2018, respectively. Cash dividends declared by the Board and paid by the Company consisted of the following during the periods indicated: Year Ended December 31, 2020 2019 2018 Total quarterly cash dividends declared, per share $ 0.70 $ 2.80 $ 2.80 Total cash dividends paid (in thousands) 11,361 45,552 45,247 The Company suspended payment of cash dividends upon the onset of the pandemic and as part of accepting benefits from the Treasury under the PSPA and PSP2, the Company has agreed not to pay cash dividends through March 31, 2022.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Investments The Company measures certain financial assets and liabilities at fair value on a recurring basis. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Accounting standards pertaining to fair value measurements establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: Level 1 - Defined as observable inputs such as quoted prices in active markets for identical assets or liabilities Level 2 - Defined as inputs other than Level 1 inputs that are either directly or indirectly observable Level 3 - Defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions The Company uses the market approach valuation technique to determine fair value for investment securities. The assets classified as Level 1 consist of money market funds for which original cost approximates fair value. The assets classified as Level 2 consist of commercial paper, municipal debt securities, federal agency debt securities, corporate debt securities, and US treasury bonds, which are valued using quoted market prices or alternative pricing sources including transactions involving identical or comparable assets and models utilizing market observable inputs. The Company has no investment securities classified as Level 3. For those assets classified as Level 2 that are not in active markets, the Company obtains fair value from pricing sources using quoted market prices for identical or comparable instruments, and uses pricing models which include all significant observable inputs: maturity dates, issue dates, settlement dates, benchmark yields, reported trades, broker-dealer quotes, issue spreads, benchmark securities, bids, offers and other market related data. These inputs are observable or can be derived from, or corroborated by, observable market data for substantially the full term of the asset. Financial instruments measured at fair value on a recurring basis: As of December 31, 2020 As of December 31, 2019 (in thousands) Total Level 1 Level 2 Total Level 1 Level 2 Cash equivalents Money market funds $ 5,340 $ 5,340 $ — $ 42,653 $ 42,653 $ — Commercial paper 48,908 — 48,908 5,807 — 5,807 Municipal debt securities 34,338 — 34,338 1,202 — 1,202 Federal agency debt securities 51,400 — 51,400 — — — Total cash equivalents 139,986 5,340 134,646 49,662 42,653 7,009 Short-term Commercial paper 229,821 — 229,821 161,286 — 161,286 Corporate debt securities 166,768 — 166,768 145,975 — 145,975 Federal agency debt securities 48,598 — 48,598 13,515 — 13,515 Municipal debt securities 87,290 — 87,290 12,237 — 12,237 US Treasury Bonds — — — 2,915 — 2,915 Total short-term 532,477 — 532,477 335,928 — 335,928 Long-term Corporate debt securities — — — 15,396 — 15,396 US Treasury Bonds — — — 146 — 146 Total long-term — — — 15,542 — 15,542 Total financial instruments $ 672,463 $ 5,340 $ 667,123 $ 401,132 $ 42,653 $ 358,479 There were no significant transfers between Level 1 and Level 2 assets for the years ended December 31, 2020 or 2019. Long-term Debt None of the Company's long-term debt is publicly traded. The Company has determined the estimated fair value of all of this debt to be Level 3, as certain inputs used to determine the fair value of these agreements are unobservable and, therefore, could be sensitive to changes in inputs.The Company utilizes the discounted cash flow method to estimate the fair value of Level 3 debt. Carrying value and estimated fair value of long-term debt, including current maturities and without reduction for related costs: As of December 31, 2020 As of December 31, 2019 (in thousands) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Fair Value Level Non-publicly held debt $ 1,555,637 $ 1,191,008 $ 1,329,882 $ 1,140,232 3 Other Due to the short term nature, carrying amounts of cash, cash equivalents, restricted cash, accounts receivable and accounts payable approximate fair value.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is subject to income taxation in the United States, foreign countries and various state jurisdictions in which it operates. In accordance with income tax accounting standards, the Company recognizes tax benefits or expenses on the temporary differences between the financial reporting and tax bases of its assets and liabilities. In 2020, 2019 and 2018, the Company recorded net tax (benefit)/provision of $(177.0) million, $69.1 million and $37.5 million, respectively. Cash taxes, net of refunds, were $(95.2) million, $2.2 million and $41.6 million, respectively. Components of Income before Income Taxes from Continuing Operations The components of income before taxes for domestic and foreign operations consisted of the following: Year ended December 31, (in thousands) 2020 2019 2018 Domestic $ (361,242) $ 299,330 $ 195,843 Foreign 175 1,917 3,475 Total $ (361,067) $ 301,247 $ 199,318 Income Tax Provision/(Benefit) The provision for income taxes is composed of the following: Year ended December 31, (in thousands) 2020 2019 2018 Current: Federal $ (195,572) $ (34) $ (3,707) State (211) 505 (650) Foreign 132 530 1,086 Total current (195,651) 1,001 (3,271) Deferred: Federal 24,126 63,430 41,593 State (5,449) 4,699 3,744 Foreign — — (4,550) Total deferred 18,677 68,129 40,787 Total income tax provision $ (176,974) $ 69,130 $ 37,516 Reconciliation of Effective Tax Rate The effective tax rate on income before income taxes differed from the federal statutory income tax rate as follows: Year ended December 31, (in thousands) 2020 2019 2018 Income tax expense at federal statutory rate $ (70,459) $ 63,262 $ 41,857 State income taxes, net of federal income tax benefit (5,495) 5,070 3,560 CARES Act (97,988) — — Foreign income tax expense 132 530 (3,464) Other (3,164) 268 (4,437) Total income tax expense $ (176,974) $ 69,130 $ 37,516 Deferred Taxes The major components of the Company’s net deferred tax assets and liabilities are as follows: As of December 31, (in thousands) 2020 2019 Deferred tax assets: Accrued vacation $ 1,024 $ 907 Accrued bonus — 5,523 State taxes — 88 Accrued property taxes 1,111 1,742 Stock-based compensation expense 1,025 1,415 Net operating loss 15,979 58,066 Tax credit 10,995 — Less: valuation allowance 1,214 1,193 Total deferred tax assets 28,920 66,548 Deferred tax liabilities: Prepaid expenses 2,517 6,211 Depreciation 308,266 278,554 Other 20,242 14,522 Total deferred tax liabilities 331,025 299,287 Net deferred tax liabilities $ 302,105 $ 232,739 Net Operating Loss and Tax Credit Carryforwards Pursuant to the CARES Act, the Company carried back net operating losses generated in 2018, 2019 and 2020 in the amounts of $185.4 million, $116.7 million and $422.1 million respectively to tax years ended December 31, 2013 through December 31, 2016. The net operating loss carryback resulted in prior years’ foreign tax credits and general business credits being released, and these credits generated in 2014 - 2020 in the amount of $5.7 million and $5.2 million will be carried forward. The foreign tax credit and general business credits will expire 2024 – 2040, but the Company expects to utilize these credits prior to the expiration. In addition, as of December 31, 2020, the Company recognized federal and state net operating loss carryforwards for income tax purposes in the amount of $8.5 million and $7.4 million, respectively. Federal net operating loss carryforwards will not expire per the “Tax Cuts and Jobs Act” (the “Tax Act”). The majority of the state net operating loss carryforward amounts will expire between 2022 and 2040 while some state net operating losses have an indefinite carryforward period. The Company previously recognized a federal capital loss carryforward of $0.7 million, as remeasured pursuant to the Tax Act, as of December 31, 2016 which expired in 2021. Tax Contingencies The reconciliation of the Company's tax contingencies is as follows: As of December 31, (in thousands) 2020 2019 2018 Beginning Balance $ 3,970 $ 4,175 $ 778 Increases for tax position of prior years — — 3,364 Increases for tax position of current year — 146 293 Decreases for tax positions of prior years (3,602) (135) (10) Settlements (26) (216) (110) Decreases for lapses in statute of limitations — — (140) Ending Balance $ 342 $ 3,970 $ 4,175 The Company's policy is to recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense. The Company’s income tax returns are subject to examination by the Internal Revenue Service as well as

Related Party Transactions (Not

Related Party Transactions (Notes)	12 Months Ended
	Dec. 31, 2020
Related Party Transactions [Abstract]
Related Party Transactions	Related Party TransactionsDuring the years ended December 31, 2020 and 2019, 2018 there were no related party transactions that required disclosure.

Employee Benefit Plans (Notes)

Employee Benefit Plans (Notes)	12 Months Ended
	Dec. 31, 2020
Employee Benefit Plans [Abstract]
Employee Benefit Plans	Employee Benefit Plans 401(k) Plan The Company has a defined contribution plan covering all eligible employees. Under the plan, employees may contribute up to 90 percent of their eligible annual compensation with the Company making matching contributions on employee deferrals of up to 5 percent of eligible employee wages. The matching contributions on pilot deferrals is 10 percent of eligible wages resulting from the pilot collective bargaining agreement. The Company recognized expense under this plan of $18.6 million, $19.0 million, and $19.1 million for the years ended December 31, 2020, 2019 and 2018, respectively. Share-based employee compensation The Company reserved 2,000,000 shares of common stock for the Company to grant stock options, restricted stock, cash-settled stock appreciation rights ("SARs") and other stock-based awards to certain officers, directors and employees of the Company under the 2016 Long-Term Incentive Plan (the "2016 Plan"). The 2016 Plan is administered by the Company’s compensation committee of the Board of Directors. Employee Stock Purchase Plan The Company reserved 1,000,000 shares of common stock for employee purchases under the 2014 Employee Stock Purchase Plan ("ESPP"). Shares are purchased semi-annually, at a discount, based on the market value at period-end. Employees may contribute up to 25 percent of their base pay per offering period, not to exceed $25,000 each calendar year, for the purchase of common stock. The ESPP is a compensatory plan under applicable accounting guidance and results in the recognition of compensation expense. The following table provides information about the Company’s ESPP activity during 2020, 2019, and 2018: Total number of shares purchased in year Average price paid per share Weighted-average fair value of discount under the ESPP (1) As of December 31, 2018 33,300 $ 134.31 $ 16.79 As of December 31, 2019 38,464 $ 133.54 $ 23.51 As of December 31, 2020 56,866 $ 90.63 $ 14.10 (1) The weighted-average fair value of the discount under the ESPP granted is equal to a percentage discount from the market value of the common stock at the end of each semi-annual purchase period. The Company increased the discount from 10 percent to 15 percent for the second offering period of 2018. 15 percent is the maximum allowable discount under the ESPP. Compensation expense For the years ended December 31, 2020, 2019 and 2018, the Company recorded compensation expense of $20.1 million, $19.2 million and $15.6 million, respectively, related to restricted stock, stock options, cash-settled SARs and the ESPP. Forfeiture rates are estimated at the time of grant based on historical actuals for similar grants, and are matched to actuals over the vesting period. The unrecognized compensation cost was $27.5 million as of December 31, 2020 for unvested restricted stock expected to be recognized over a weighted-average period of 1.34 years. As of December 31, 2020, there was no unrecognized compensation cost for either cash-settled SARs or stock options. Stock options The fair value of stock options granted is estimated as of the grant date using the Black-Scholes option pricing model. The contractual terms of the Company’s stock option awards granted range from five to ten years. A summary of option activity as of December 31, 2020, 2019 and 2018, and changes during the years then ended, is presented below: Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life (years) Aggregate Intrinsic Value (thousands) Outstanding at December 31, 2017 27,575 $ 97.88 0.72 $ 1,568 Exercised (17,838) 92.04 Outstanding at December 31, 2018 9,737 $ 108.59 0.18 $ — Exercised (9,737) 108.59 Outstanding at December 31, 2019 — $ — 0.00 $ — Exercised — — Outstanding at December 31, 2020 — $ — 0.00 $ — During the years ended December 31, 2020, 2019 and 2018, the total intrinsic value of options exercised was $0.0 million, $0.2 million and $1.4 million, respectively. Cash received from option exercises for the years ended December 31, 2020, 2019 and 2018 was $0.0 million, $1.1 million and $1.6 million, respectively. Restricted stock awards The closing price of the Company's stock on the date of grant is used as the fair value for the issuance of restricted stock. A summary of the status of non-vested restricted stock grants during the years ended December 31, 2020, 2019 and 2018 is presented below: Shares Weighted Average Grant Date Fair Value Per Share Non-vested at December 31, 2017 192,890 $ 153.32 Granted 102,842 155.02 Vested (85,410) 153.85 Forfeited (14,128) 154.65 Non-vested at December 31, 2018 196,194 $ 153.88 Granted 218,477 143.72 Vested (104,816) 152.07 Forfeited (15,047) 148.97 Non-vested at December 31, 2019 294,808 $ 147.25 Granted 267,169 137.80 Vested (291,303) 147.58 Forfeited (5,147) 145.82 Non-vested at December 31, 2020 265,527 $ 142.25 The total fair value of restricted stock that vested during the years ended December 31, 2020, 2019 and 2018 was $43.0 million, $15.9 million and $13.4 million, respectively. Cash-settled SARs Cash-settled SARs are liability classified awards for which the fair value and compensation expense recognized are updated monthly using the Black-Scholes option pricing model. The following range of assumptions in the Black-Scholes pricing model was used to determine fair value as of December 31 of the years indicated below (all cash-settled SARs were fully vested as of December 31, 2019): 2020 2019 2018 Weighted-average volatility — % — % 35.0 % Expected term (in years) N/A N/A 0.8 Risk-free interest rate — % — % 2.6 % Dividend yield — % — % 1.68 % These rights were fully vested as of December 31, 2019. Expected volatilities used for award valuation are based on the historical volatility of the Company's common stock price. Expected term represents the weighted average time between the award’s grant date and its expected exercise date. The Company estimated the expected term assumption in 2020, 2019 and 2018 using historical award exercise activity and employee termination activity. The risk-free interest rate for periods equal to the expected term of an award is based on a blended historical rate using Federal Reserve rates for U.S. Treasury securities. The dividend yield reflects the effect that paying a dividend has on the fair value of the Company's stock. The contractual term of the Company’s cash-settled SARs awards granted is five years. A summary of cash-settled SARs awards activity during the years ended December 31, 2020, 2019 and 2018 is presented below: # of SARs Weighted Average Exercise Price Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value (thousands) Balance at December 31, 2017 80,464 $ 155.13 Forfeited (12,890) 181.47 Exercised (13,642) 98.37 Balance at December 31, 2018 53,932 $ 163.19 Exercised (9,886) 135.53 Balance at December 31, 2019 44,046 $ 169.40 Forfeited (29,046) 181.47 Exercised (15,000) 186.85 Balance at December 31, 2020 — $ — 0.00 $ — Vested at December 31, 2020 — $ — 0.00 $ — Exercisable at December 31, 2020 — $ — 0.00 $ —

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company leases assets including aircraft, office facilities, office equipment, certain airport and terminal facilities, and other space. These commitments have remaining non-cancelable lease terms, which range from 2021 to 2048. Refer to Note 8 for more information on the Company's lease agreements. The Company's contractual purchase commitments consist primarily of aircraft and engine acquisitions. The total future commitments are as follows: (in thousands) As of December 31, 2020 2021 65,900 2022 21,000 Total purchase commitments $ 86,900 Aircraft Commitments Through December 31, 2020, the Company has entered into purchase agreements for five Airbus A320 series aircraft which are expected to deliver in 2021 and 2022. Contingencies The Company is party to collective bargaining agreements with the employee groups listed below. As of December 31, 2020 the percentage of full-time equivalent employees for these pay groups were as follows: As of December 31, 2020 Flight Attendants 36.1 % Pilots 23.2 Flight Dispatchers 1.1 Total 60.3 % See Item I - Business, for further discussion on the status of each group which has elected union representation. The Company is subject to certain other legal and administrative actions it considers routine to its business activities. The Company believes the ultimate outcome of any pending legal or administrative matters will not have a material adverse impact on its financial position, liquidity or results of operations.

Valuation and Qualifying Accoun

Valuation and Qualifying Accounts (Notes)	12 Months Ended
	Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]	Valuation and Qualifying Accounts (in thousands) Balance at Beginning of Year Changes Charged to Statement of Income Accounts Write Offs (net of recoveries) Balance at End of Year Allowance for expendable parts and supplies For the Year Ended December 31, 2020 $ 2,748 $ 1,575 $ — $ 4,323 For the Year Ended December 31, 2019 (1) 14,410 2,257 (13,919) 2,748 For the Year Ended December 31, 2018 13,756 2,624 (1,970) 14,410 (1) Increase in write offs mostly related to disposal of MD-80 fleet parts in 2019.

Operating Segment Segment Repor

Operating Segment Segment Reporting (Notes)	12 Months Ended
	Dec. 31, 2020
Segment Reporting [Abstract]
Segment Reporting Disclosure [Text Block]	Segments Operating segments are components of a company for which separate financial and operating information is regularly evaluated and reported to the Chief Operating Decision Maker ("CODM"), and is used to allocate resources and analyze performance. The Company's CODM is the executive leadership team, which reviews information about the Company's three operating segments: Airline, Sunseeker Resort, and other non-airline. Airline Segment The Airline segment operates as a single business unit and includes all scheduled service air transportation, ancillary air-related products and services, third party products and services, fixed fee contract air transportation and other airline-related revenue. The CODM evaluation includes, but is not limited to, route and flight profitability data, ancillary and third party product and service offering statistics, and fixed fee contract information when making resource allocation decisions with the goal of optimizing consolidated financial results. Sunseeker Resort Segment The Sunseeker Resort segment represents activity related to the development and construction of Sunseeker Resort in Southwest Florida, as well as the operation of Kingsway Golf Course. Due to the various impacts of COVID-19, the Company suspended construction of Sunseeker Resort and temporarily closed operation of Kingsway Golf Course. At this time, it is uncertain if and when construction will resume and the golf course will re-open. Other non-Airline Segment The other non-airline segment includes the Teesnap golf course management solution and Allegiant Nonstop family entertainment centers. Allegiant Nonstop family entertainment centers are comprised of games, attractions, and food facilities. Due to the impacts of COVID-19, the Company permanently closed the Allegiant Nonstop locations in Warren, MI, Clearfield, Utah, and the Allegiant Nonstop location in West Jordan, Utah, which was being developed. In July 2019, management began evaluating strategic alternatives for Teesnap, and its business-to-business software as a service offering. As the Company's current strategy has a business to customer focus, rather than business to business, management determined that the best course of action for both entities would be to sell Teesnap and management is actively pursuing this avenue. Selected information for the Company's segments and the reconciliation to the consolidated financial statement amounts are as follows: (in thousands) Airline Sunseeker Resort Other non - airline Consolidated Year Ended December 31, 2020 Operating revenue: Passenger $ 902,187 $ — $ — $ 902,187 Third party products 46,482 — — 46,482 Fixed fee contract 26,865 — — 26,865 Other 1,462 650 12,427 14,539 Operating income (loss) (104,745) (145,721) (30,519) (280,985) Interest expense, net 50,355 562 — 50,917 Depreciation and amortization 174,882 615 770 176,267 Capital expenditures 262,748 45,160 442 308,350 Year Ended December 31, 2019 Operating revenue: Passenger $ 1,682,955 $ — $ — $ 1,682,955 Third party products 70,012 — — 70,012 Fixed fee contract 65,057 — — 65,057 Other 4,474 2,048 16,419 22,941 Operating income (loss) 388,740 (6,588) (18,202) 363,950 Interest expense, net 58,112 1,694 — 59,806 Depreciation and amortization 151,060 1,250 3,542 155,852 Capital expenditures 438,765 66,659 18,304 523,728 Year Ended December 31, 2018 Operating revenue: Passenger $ 1,533,701 $ — $ — $ 1,533,701 Third party products 58,060 — — 58,060 Fixed fee contract 50,286 — — 50,286 Other 17,125 601 7,674 25,400 Operating income (loss) 255,888 (3,299) (9,130) 243,459 Interest expense, net 44,534 2 — 44,536 Depreciation and amortization 127,460 129 1,762 129,351 Capital expenditures 290,998 32,635 16,657 340,290 Total assets were as follows as of the dates indicated: (in thousands) As of December 31, 2020 As of December 31, 2019 Airline $ 3,214,523 $ 2,830,236 Sunseeker Resort 36,612 133,362 Other non-airline 7,790 47,205 Consolidated $ 3,258,925 $ 3,010,803

Impairment (Notes)

Impairment (Notes)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Restructuring, Impairment, and Other Activities Disclosure [Text Block]	Impairment Accounting Standards Codification (ASC) 360 - Property, Plant, and Equipment (ASC 360) requires long-lived assets to be assessed for impairment when events and circumstances indicate that the assets may be impaired. As described in Note 2, the Company's operations and liquidity were significantly impacted by decreased passenger demand and U.S. government travel restrictions and quarantine requirements due to COVID-19. As a result of these events and circumstances, the Company performed impairment tests on its long-lived assets in connection with the preparation of its financial statements. In accordance with ASC 360, an impairment of a long-lived asset or group of long-lived assets exists only when the sum of the estimated undiscounted future cash flows expected to be generated directly by the assets is less than the carrying value of the assets. Assets were grouped by operating segment when estimating future cash flows, and further grouped within each segment as applicable. Estimates of future cash flows were generally based on historical results, and management's best estimate of future market and operating conditions. Airline Segment Long-lived assets for the Airline segment consist primarily of owned and leased flight and ground equipment. To test the recoverability of the Company's airline operating fleet, undiscounted future cash flows for each aircraft under the Company's current expected operating fleet plan were assessed and it was determined that there was no impairment as of December 31, 2020. As the Company obtains greater clarity about the duration and extent of reduced demand due to COVID-19, the Company will continue to evaluate its current fleet compared to network requirements and may decide to permanently retire additional aircraft. The Airline has an equity investment in a technology company. A $5.0 million charge was recorded to impair the investment in the second quarter 2020. As a result of the impairment, net book value of the investment is zero. This decision reflects management's best estimate of the fair value of this investment based on recent market trends. Sunseeker Resort Segment Long-lived assets for Sunseeker Resort and related Kingsway Golf Course consist primarily of the land, construction in process, building, and other various equipment. As a result of the impairment tests performed, the Company determined the sum of the undiscounted cash flows was less than the long-lived assets' carrying value. Impairment charges of $128.9 million and $1.1 million were recorded for Sunseeker Resort and Kingsway Golf Course respectively, in the first quarter 2020 to reflect the difference between the carrying values of these assets and their fair values. Fair value reflects management's best estimate, including valuation inputs from third parties and recent market transactions. Based on an evaluation of impairment indicators in the second, third and fourth quarters 2020, no additional impairment was recognized. Other non-airline Segment Long-lived assets for Allegiant Nonstop family entertainment centers consisted primarily of leasehold improvements, arcade games, various equipment, and ROU assets. As a result of the impairment tests performed, the Company determined the sum of the undiscounted cash flows were less than the long-lived assets' carrying value. An $18.3 million impairment charge was recorded in the first quarter 2020 to reflect the difference between the carrying values of these assets and their fair values. Fair value reflects management's best estimate, including valuation inputs from third parties and recent market trends. Based on an evaluation of impairment indicators in the second, third and fourth quarters 2020, no additional impairment was recognized. Long-lived assets for Teesnap consist primarily of capitalized software and computer equipment. As a result of the impairment tests performed, the Company determined the sum of the undiscounted cash flows was less than the long-lived assets' carrying value. Management does not expect to recover any of the book value of the assets through operations, and an $8.3 million impairment charge was recorded in the first quarter 2020 to write down all long-lived assets to a net book value of zero. This reflects management's best estimate of the fair value of these assets as of the date of the impairment based on recent market trends.

Subsequent Events (Notes)

Subsequent Events (Notes)	12 Months Ended
	Dec. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On January 15, 2021, the Company through its airline operating subsidiary Allegiant Air, LLC entered into a Payroll Support Program Extension Agreement (the “PSP2”) with the Treasury for the first installment of an award Allegiant Air is to receive under the Payroll Support Program Extension. The total amount expected to be allocated to Allegiant Air under the Payroll Support Extension Program is approximately $91.8 million. The Company received an initial installment of $45.9 million in January 2021, which must be used exclusively for wages, salaries and benefits. The remainder of funds are expected to be received during first quarter 2021. If additional funds are allocated by the Treasury under the PSP2 such that the amount received by the Company exceeds $100.0 million, then Allegiant Air will issue a note for 30 percent of the funds received under the PSP2 in excess of $100.0 million and the Company will issue to Treasury warrants to purchase a number of shares of common stock of the Company (based on 10 percent of the amount of Note issued) at a price of $179.23 per share (based on the closing price of the Company’s common stock on The Nasdaq Global Select Market on December 24, 2020). In connection with the PSP2, the Company will be required to comply with the relevant provisions of the CARES Act for a longer period of time, including prohibiting the repurchase of common stock and the payment of cash dividends until March 31, 2022, as well as restricting the payment of certain executive compensation for periods through October 1, 2022.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies - (Policies)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation [Policy Text Block]	Basis of Presentation The accompanying consolidated financial statements include the accounts of Allegiant Travel Company and its majority-owned operating subsidiaries. The Company's investments in unconsolidated affiliates, which are 50 percent or less owned, are accounted for under the equity or cost method. All intercompany balances and transactions have been eliminated. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results could differ from these estimates. The Company adopted Accounting Standards Update (ASU) 2016-02, Leases (Topic 842), (the "New Lease Standard") effective January 1, 2019 using the modified retrospective transition approach. Under this method, the cumulative effect adjustment to the opening balance of retained earnings was recognized at the adoption date. As a result, the Company was not required to adjust its comparative period financial information for effects of the standard or make the new required lease disclosures for periods before the date of adoption on January 1, 2019. See Recent Accounting Pronouncements below for further information. The Company adopted Accounting Standards Update (ASU) 2016-13, Measurement of Credit Losses on Financial Instruments (Topic 326) effective January 1, 2020. The standard requires the use of an “expected loss” model on certain types of financial instruments. The standard also amends the impairment model for available-for-sale debt securities and requires estimated credit losses to be recorded as allowances instead of reductions to amortized cost of the securities. The Company adopted this accounting standard prospectively as of January 1, 2020 and it did not have a significant impact on its consolidated financial statements.
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and Cash EquivalentsCash and cash equivalents include investments and interest bearing instruments with maturities of three months or less at the balance sheet date. Such investments are carried at cost which approximates fair value.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Restricted Cash
Receivable [Policy Text Block]	Accounts Receivable Accounts receivable are carried at face amount which approximates fair value. In addition to income tax receivables, the accounts receivable consist primarily of amounts due from credit card companies associated with the sale of tickets for future travel. These receivables are short-term and generally settle within a few days of sale. There are also receivables related to commission amounts due from Enterprise Holdings Inc. based on terms in the rental car provider agreement and amounts due related to fixed fee charter agreements. If deemed necessary, the Company records charges to its allowance for doubtful accounts for amounts not expected to be collected, for which the balance was immaterial for all years presented. The Company also had outstanding receivables from a third party as of December 31, 2020 and 2019, of which $10.9 million and $11.4 million, respectively, was due more than one year after the balance sheet date and is classified with the Company's other assets.
Marketable Securities, Policy [Policy Text Block]	Short-term and Long-term Investments The Company’s investments in marketable securities are classified as available-for-sale and are reported at fair value with the net unrealized gain or (loss) reported as a component of accumulated other comprehensive income (loss) in shareholders’ equity. For investments in an unrealized loss position, the Company determines whether a credit loss exists by considering information about the collectability of the instrument and current market conditions. There have been no credit losses. Investment securities with original maturities of three months or less are classified as cash equivalents. Investment securities with original maturities greater than three months are classified as either short-term investments or long-term investments based on the maturity date in relation to the balance sheet date. Short-term investments have a maturity date less than or equal to one year from the balance sheet date, and long-term investments have a maturity date greater than one year from the balance sheet date. As of December 31, 2019, the Company’s long-term investments consisted of corporate debt securities, federal agency debt securities, US Treasury Bonds, and municipal debt securities with contractual maturities of less than 24 months. The amortized cost of investment securities sold is determined by the specific identification method with any realized gains or losses reflected in other (income) expense. The Company had minimal realized losses during the years ended December 31, 2020, 2019, and 2018. The Company believes unrealized losses related to debt securities are not other-than-temporary and does not intend to sell these securities prior to amortized cost recoverability. The Company attempts to minimize its concentration risk with regard to its cash, cash equivalents, and investment portfolio. This is accomplished by diversifying and limiting amounts among different counterparties, the type of investment, and the amount invested in any individual security, commercial paper, or money market fund.
Inventory, Policy [Policy Text Block]	Expendable Parts, Supplies and Fuel, Net Expendable parts, supplies and fuel inventories are valued at cost using the first-in, first-out method. Such inventories are charged to expense as they are used in operations. An obsolescence allowance for expendable parts and supplies is based on salvage values and the average remaining useful life of the Airbus fleet. The obsolescence allowance for expendable parts and supplies was $4.3 million and $2.7 million at December 31, 2020 and 2019, respectively. Rotable aircraft parts inventories are included in property and equipment.
Lessee, Leases [Policy Text Block]	Operating Lease Right-of-Use Asset and Liability The Company determines if an arrangement is a lease at inception and has lease agreements for aircraft, office facilities, office equipment, certain airport and terminal facilities, and other space and assets with non-cancelable lease terms. Certain real estate and property leases, aircraft leases, and various other operating leases are measured on the balance sheet with a lease liability and right-of-use ("ROU") asset. Airport terminal leases mostly include variable lease payments outside of those based on a fixed index, and are therefore excluded from consideration. ROU assets represent the Company's right to use an underlying asset for the lease term, and lease liabilities represent the obligation to make scheduled lease payments. ROU assets and liabilities are recognized on the lease commencement date based on the present value of lease payments over the lease term. The present value of lease payments is calculated using the incremental borrowing rate at lease commencement, which takes into consideration recent debt issuances as well as other applicable market data available. Lease payments include fixed payments, variable payments based on an index or rate, reasonably certain purchase options, termination penalties, and others as required by the New Lease Standard. Lease payments do not include variable lease payments other than those that depend on an index or rate, any guarantee by the lessee of the lessor’s debt, or any amount allocated to non-lease components. Lease terms include options to extend when it is reasonably certain that the option will be exercised. Leases with a term of 12 months or less are not recorded on the balance sheet. Additionally, lease and non-lease components are accounted for as a single lease component for real estate agreements.
Property, Plant and Equipment, Policy [Policy Text Block]	Property and Equipment Property and equipment are recorded at cost and depreciated using the straight-line method over their estimated useful lives less any estimated salvage value. Property under finance leases and related obligations are initially recorded at an amount equal to the present value of future minimum lease payments computed on the basis of the Company’s incremental borrowing rate, and depreciation is recorded on a straight-line basis and is included within depreciation and amortization expense. The estimated useful lives of the principal asset classes are shown below. Aircraft, engines and related rotable parts 10-25 years Buildings and leasehold improvements 10-25 years Equipment 3-10 years Computer hardware and software 3-10 years In estimating the useful lives and residual values of aircraft, the Company primarily relies upon actual experience with the same or similar aircraft types, current and projected future market information, and recommendations from other industry sources. Subsequent revisions to these estimates could be caused by changing market prices of the Company’s aircraft, changes in utilization of the aircraft, and other fleet events. These estimates are evaluated each reporting period and adjusted if necessary. Changes in the estimate for useful lives or residual values of the Company’s property and equipment could result in changes in depreciation expense.
Internal Use Software, Policy [Policy Text Block]	Software Capitalization The Company capitalizes certain internal and external costs related to the acquisition and development of computer software during the application development stage of projects. The Company amortizes these capitalized costs using the straight-line method over the estimated useful life of the software, which typically ranges from three
Maintenance and Repair Costs, Policy [Policy Text Block]	Aircraft Maintenance and Repair Costs The Company accounts for all non-major maintenance and repair costs incurred for its Airbus fleet under the direct expense method. Under this method, maintenance and repair costs for aircraft are charged to operating expenses as incurred. Maintenance and repair costs includes all parts, materials, and line maintenance activities required to maintain the Company's fleet. The Company accounts for major maintenance costs of its Airbus airframes and the related CFM engines using the deferral method. Under this method, the Company capitalizes the cost of major maintenance events, which are amortized as a component of depreciation and amortization expense, over the estimated period until the next scheduled major maintenance event. During 2020 and 2019, the Company capitalized $12.8 million and $64.1 million of major maintenance costs for engines with associated amortization expense of $17.6 million and $11.1 million, respectively. During 2020 and 2019, the Company capitalized $22.6 million and $18.4 million of major maintenance costs for airframes with associated amortization expense of $19.9 million and $14.9 million, respectively.
Measurement of Impairment of Long-Lived Assets, Policy [Policy Text Block]	Measurement of Impairment of Long-Lived Assets The Company records impairment losses on long-lived assets used in operations, consisting principally of property and equipment, when events or changes in circumstances indicate, in management’s judgment, that the assets might be impaired, and the undiscounted future cash flows estimated to be generated by those assets are less than the carrying amount of those assets. In making these determinations, the Company utilizes certain assumptions, including, but not limited to: (i) estimated fair value of the assets; and (ii) estimated future cash flows expected to be generated by these assets, which are based on additional assumptions such as asset utilization, length of service for which the asset will be used in operations, and estimated salvage values. For the year ended December 31, 2020, the Company recorded a $161.6 million impairment as a result of COVID-19. The impairment is more fully discussed in Note 17.
Revenue [Policy Text Block]	Revenue Recognition Passenger revenue Passenger revenue includes scheduled service revenue, ancillary air-related charges, and travel point redemptions from the co-branded Allegiant World Mastercard® credit card. Scheduled service revenue consists of ticket revenue generated from nonstop flights in the Company’s route network, recognized either when the transportation is provided or when the itinerary expires unused. Nonrefundable scheduled itineraries expire on the date of the intended flight, unless the date is extended by notification from the customer in advance. Itineraries sold for transportation not yet used, as well as unexpired credits, are included in air traffic liability. Ancillary air-related charges include various unbundled services and products related to the flight such as baggage fees, the use of the Company’s website to purchase scheduled service transportation, advance seat assignments, and other services. Revenues from air-related charges are recognized when the transportation is provided. If a customer cancels a flight, a voucher may be issued for a future flight, at which time the associated revenue is recognized. Additionally, the Company estimates the value of vouchers that will expire unused and recognizes such revenue at the time of issuance. Various taxes and fees, assessed on the sale of tickets to customers, are collected by the Company serving as an agent, and remitted to taxing authorities. These taxes and fees are not included as revenue in the Company’s consolidated statements of income and are recorded as a liability until remitted to the appropriate taxing authority. Revenue from travel point redemptions from the co-branded credit card are described in the Affinity Credit Card Program section below. Third party products revenue Ancillary third party products revenue is generated from the sale of hotel rooms, rental cars and ticket attractions, as well as marketing revenue associated with the co-branded credit card. Revenue from the sale of third party products is recognized at the time the product is utilized, such as the time a purchased hotel room is occupied. The Company follows accounting standards for determining the amount of revenue to be recognized for each element of a bundled sale involving third party products in addition to airfare. Revenue from the sale of third party products is recorded net of amounts paid to wholesale providers, travel agent commissions, and transaction costs. Pursuant to the co-brand arrangement with Bank of America, the Company has various performance obligations which are collectively referred to as the marketing component. These obligations consist of use of the Company’s brand and access to its member lists, and certain other advertising and marketing elements. The marketing component is recorded as third party products revenue in the period in which points are awarded to the credit card holders. Fixed fee contract revenue Fixed fee contract revenue consists of agreements to provide charter service on a year-round and ad hoc basis. Fixed fee contract revenue is recognized when the transportation is provided. Other revenue Other revenue is generated from non-airline activities as well as leasing aircraft and engines. Lease revenue is recognized ratably over the lease term. Affinity Credit Card Program The Allegiant World Mastercard® is issued by Bank of America through which arrangement points are sold and consideration is received under an agreement that was amended in 2020 and expires in 2029. Under this arrangement, the Company identified the following deliverables: travel points to be awarded (the travel component), use of the Company’s brand and access to its
Advertising Cost [Policy Text Block]	Advertising Costs
Earnings Per Share, Policy [Policy Text Block]	Earnings per Share Basic and diluted earnings per share are computed pursuant to the two-class method as opposed to the treasury method. Under the two-class method, the Company attributes net income to two classes, common stock and unvested restricted stock awards. Unvested restricted stock awards granted to employees under the Company’s Long-Term Incentive Plan are considered participating securities because they receive non-forfeitable rights to cash dividends at the same rate as common stock. Diluted net income per share is calculated using the more dilutive of two methods. Under both methods, the exercise of employee stock options is assumed using the treasury stock method. The assumption of vesting of restricted stock, however, differs as described below: 1. Assume vesting of restricted stock using the treasury stock method. 2. Assume unvested restricted stock awards are not vested, and allocate earnings to common shares and unvested restricted stock awards using the two-class method. For the years ended December 31, 2019 and 2018, the second method above was used in the computation because it was more dilutive than the first method. Given the loss position in 2020, both methods yield the same result. The following table sets forth the computation of net income (loss) per share on a basic and diluted basis for the periods indicated: Year ended December 31, (in thousands, except per share data) 2020 2019 2018 Basic: Net income (loss) $ (184,093) $ 232,117 $ 161,802 Less net income (loss) allocated to participating securities (236) (3,413) (2,106) Net income (loss) attributable to common stock $ (184,329) $ 228,704 $ 159,696 Earnings (loss) per share, basic $ (11.53) $ 14.27 $ 10.02 Weighted-average shares outstanding 15,992 16,027 15,941 Diluted: Net income (loss) $ (184,093) $ 232,117 $ 161,802 Less net income (loss) allocated to participating securities (236) (3,410) (2,104) Net income (loss) attributable to common stock $ (184,329) $ 228,707 $ 159,698 Earnings (loss) per share, diluted $ (11.53) $ 14.26 $ 10.00 Weighted-average shares outstanding 15,992 16,027 15,941 Dilutive effect of stock options and restricted stock — 51 53 Adjusted weighted-average shares outstanding under treasury stock method 15,992 16,078 15,994 Participating securities excluded under two-class method — (37) (27) Adjusted weighted-average shares outstanding under two-class method 15,992 16,041 15,967
Share-based Payment Arrangement [Policy Text Block]	Share-Based Compensation The Company accounts for share-based compensation in accordance with accounting standards which require the compensation cost related to share-based payment transactions be recognized in the Company’s consolidated statements of income. The share-based cost is measured based on grant date fair value. The Company’s share-based employee compensation plan is more fully discussed in Note 13.
Income Tax, Policy [Policy Text Block]	Income Taxes The Company recognizes deferred income taxes based on the asset and liability method required by accounting standards. Deferred tax assets and liabilities are determined based on the timing differences between book basis for financial reporting purposes and tax basis of the asset and liability and measured using the enacted tax rates and provisions of the enacted tax law. A valuation allowance for deferred tax assets is provided if it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company determines the net non-current deferred tax assets or liabilities separately for federal, state, foreign and other local jurisdictions. The Company’s income tax returns are subject to examination by the Internal Revenue Service (“IRS”) and other tax authorities in the jurisdictions where the Company operates. The Company assesses potentially unfavorable outcomes of such examinations based on the criteria set forth in uncertain tax position accounting standards. The accounting standards prescribe a minimum recognition threshold a tax position is required to meet before being recognized in the financial statements. Accounting standards for income taxes utilize a two-step approach for evaluating tax positions. Recognition (Step I) occurs when the Company concludes that a tax position, based on its technical merits, is more likely than not to be sustained upon examination. Measurement (Step II) is only addressed if the position is deemed to be more likely than not to be sustained. Under Step II, the tax benefit is measured as the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent Accounting Pronouncements In February 2016, the FASB issued the New Lease Standard. This standard requires leases, other than short-term, to be recognized on the balance sheet as a liability and a corresponding ROU asset. This standard was effective for interim and annual reporting periods beginning after December 15, 2018 and the Company adopted the New Lease Standard as of January 1, 2019. The Company also elected the package of practical expedients, which among other things, does not require reassessment of lease classification. The Company adopted the New Lease Standard using the modified retrospective transition approach as of the effective date as permitted by the amendments in ASU 2018-11, "Targeted Improvements - Leases (Topic 842)." Under this method, the cumulative effect adjustment to the opening balance of retained earnings was recognized at the adoption date. As a result, the Company was not required to adjust its comparative period financial information for effects of the standard or make the new required lease disclosures for periods before the date of adoption on January 1, 2019. The Company's consolidated balance sheet was affected by this standard, but the consolidated statements of income and cash flows were not significantly impacted. The most significant change to the consolidated balance sheet upon adoption on January 1, 2019 related to the recognition of new right-of-use (ROU) assets of $18.0 million and operating liabilities of $19.1 million. The Company's accounting for finance leases remains substantially unchanged. See Note 7 for more information on the impact of this standard. On June 16, 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments. The standard requires the use of an “expected loss” model on certain types of financial instruments. The standard also amends the impairment model for available-for-sale debt securities and requires estimated credit losses to be recorded as allowances instead of reductions to amortized cost of the securities. The Company adopted this accounting standard prospectively as of January 1, 2020, and it did not have a significant impact on its consolidated financial statements In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This standard is intended to simplify various aspects related to accounting for income taxes and is effective for fiscal years

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2020
Accounting Policies [Abstract]
Estimated Useful Lives	The estimated useful lives of the principal asset classes are shown below. Aircraft, engines and related rotable parts 10-25 years Buildings and leasehold improvements 10-25 years Equipment 3-10 years Computer hardware and software 3-10 years Property and equipment consisted of the following: As of December 31, (in thousands) 2020 2019 Flight equipment $ 2,331,499 $ 2,289,157 Computer hardware and software 149,727 171,516 Land and buildings/leasehold improvements (1) 87,030 98,885 Other property and equipment 80,601 161,760 Total property and equipment 2,648,857 2,721,318 Less accumulated depreciation and amortization (598,546) (484,510) Property and equipment, net $ 2,050,311 $ 2,236,808
Schedule of Earnings Per Share, Basic and Diluted	The following table sets forth the computation of net income (loss) per share on a basic and diluted basis for the periods indicated: Year ended December 31, (in thousands, except per share data) 2020 2019 2018 Basic: Net income (loss) $ (184,093) $ 232,117 $ 161,802 Less net income (loss) allocated to participating securities (236) (3,413) (2,106) Net income (loss) attributable to common stock $ (184,329) $ 228,704 $ 159,696 Earnings (loss) per share, basic $ (11.53) $ 14.27 $ 10.02 Weighted-average shares outstanding 15,992 16,027 15,941 Diluted: Net income (loss) $ (184,093) $ 232,117 $ 161,802 Less net income (loss) allocated to participating securities (236) (3,410) (2,104) Net income (loss) attributable to common stock $ (184,329) $ 228,707 $ 159,698 Earnings (loss) per share, diluted $ (11.53) $ 14.26 $ 10.00 Weighted-average shares outstanding 15,992 16,027 15,941 Dilutive effect of stock options and restricted stock — 51 53 Adjusted weighted-average shares outstanding under treasury stock method 15,992 16,078 15,994 Participating securities excluded under two-class method — (37) (27) Adjusted weighted-average shares outstanding under two-class method 15,992 16,041 15,967

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	Passenger revenue is the most significant category in our reported operating revenues, as outlined below: Year Ended December 31, (in thousands) 2020 2019 2018 Scheduled service $ 435,668 $ 897,631 $ 898,653 Ancillary air-related charges 453,545 770,206 621,939 Co-brand redemptions 12,974 15,118 13,109 Total passenger revenue $ 902,187 $ 1,682,955 $ 1,533,701
Contract with Customer, Asset and Liability	The following table presents the activity of the co-brand point liability as of the dates indicated: Year Ended December 31, (in thousands) 2020 2019 Balance at January 1 $ 15,613 $ 10,708 Points awarded 19,202 20,023 Points redeemed (12,974) (15,118) Balance at December 31 $ 21,841 $ 15,613

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Schedule Of Property Plant And Equipment	The estimated useful lives of the principal asset classes are shown below. Aircraft, engines and related rotable parts 10-25 years Buildings and leasehold improvements 10-25 years Equipment 3-10 years Computer hardware and software 3-10 years Property and equipment consisted of the following: As of December 31, (in thousands) 2020 2019 Flight equipment $ 2,331,499 $ 2,289,157 Computer hardware and software 149,727 171,516 Land and buildings/leasehold improvements (1) 87,030 98,885 Other property and equipment 80,601 161,760 Total property and equipment 2,648,857 2,721,318 Less accumulated depreciation and amortization (598,546) (484,510) Property and equipment, net $ 2,050,311 $ 2,236,808

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2020
Payables and Accruals [Abstract]
Schedule of Accrued Liabilities	Accrued liabilities consisted of the following: As of December 31, (in thousands) 2020 2019 Salaries, wages and benefits $ 21,878 $ 44,441 Sunseeker Resort development 14,084 15,209 Maintenance and repairs 12,847 12,713 Loyalty card program liability 10,929 11,567 Station expenses 10,526 14,573 Property taxes 9,042 12,272 Interest 6,560 6,514 Passenger taxes and fees 4,686 14,653 Advertising accruals 890 3,303 Other accruals 24,651 23,786 Total accrued liabilities $ 116,093 $ 159,031

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2020
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt consisted of the following: As of December 31, (in thousands) 2020 2019 Fixed-rate debt and finance lease obligations due through 2030 $ 525,240 $ 235,071 Variable-rate debt due through 2029 1,133,771 1,186,782 Total long-term debt and finance lease obligations, net of related costs 1,659,011 1,421,853 Less current maturities, net of related costs 217,234 173,274 Long-term debt and finance lease obligations, net of current maturities and related costs $ 1,441,777 $ 1,248,579 Weighted average fixed-interest rate on debt 5.7 % 3.7 % Weighted average variable-interest rate on debt 2.4 % 4.5 %
Schedule of Maturities of Long-term Debt [Table Text Block]	Maturities of long-term debt as of December 31, 2020, for the next five years and thereafter, in the aggregate, are: (in thousands) As of December 31, 2020 2021 $ 217,234 2022 137,252 2023 136,781 2024 806,383 2025 89,194 Thereafter 272,167 Total debt and finance lease obligations, net of related costs $ 1,659,011

Lease (Tables)

Lease (Tables)	12 Months Ended
	Dec. 31, 2020
Leases [Abstract]
Lease, Cost [Table Text Block]	The components of lease costs recognized on the statements of income were as follows: Year Ended December 31, (in thousands) Classification on the Statements of Income 2020 2019 Finance lease costs: Amortization of assets Depreciation and amortization $ 6,631 $ 6,517 Interest on lease liabilities Interest expense 5,335 5,264 Operating lease cost Aircraft lease rentals; Station operations; Maintenance and repairs; Other operating expense 12,616 3,541 Variable lease cost Station operations; Maintenance and repairs; Other operating expense 3,560 2,274 Total lease cost $ 28,142 $ 17,596
Leases of Lessee Disclosure [Text Block]	The table below presents the lease-related assets and liabilities recorded on the balance sheet. As of December 31, (in thousands) Classification on the Balance Sheet 2020 2019 Assets Operating lease assets Operating lease right-of-use assets, net $ 115,911 $ 22,081 Finance lease assets Property and equipment, net 133,175 111,665 Total lease assets $ 249,086 $ 133,746 Liabilities Current Operating Current operating lease liabilities $ 14,313 $ 2,662 Finance Current maturities of long-term debt and finance lease obligations 9,767 7,666 Noncurrent Operating Noncurrent operating lease liabilities 102,289 21,290 Finance Long-term debt and finance lease obligations 117,060 107,930 Total lease liabilities $ 243,429 $ 139,548 Weighted-average remaining lease term Operating leases 8.3 years 9.1 years Finance leases 7.6 years 9.9 years Weighted-average discount rate Operating leases 5.4 % 4.3 % Finance leases 5.0 % 4.4 %
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The table below presents supplemental cash flow information related to leases during the year ended December 31. Year Ended December 31, (in thousands) 2020 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 13,102 $ 2,927 Operating cash flows for finance leases $ 5,335 5,264 Financing cash flows for finance leases 15,908 7,336
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	The table below indicates the future minimum payments of lease liabilities as of December 31, 2020. (in thousands) Operating Leases Finance Leases 2021 $ 20,055 $ 15,871 2022 20,313 14,366 2023 20,160 26,045 2024 19,853 10,500 2025 17,723 10,500 Thereafter 44,486 82,458 Total lease payments 142,590 159,740 Less imputed interest (25,988) (32,913) Total lease obligations 116,602 126,827 Less current obligations (14,313) (9,767) Long-term lease obligations $ 102,289 $ 117,060

Stockholders' Equity Share Repu

Stockholders' Equity Share Repurchases (Tables)	12 Months Ended
	Dec. 31, 2020
Share Repurchases [Abstract]
Treasury Stock	Share repurchases consisted of the following during the periods indicated: Year Ended December 31, 2020 2019 2018 Shares repurchased (1) 197,570 103,943 — Average price per share $ 155.14 $ 141.64 NA Total (in thousands) $ 30,651 $ 14,723 $ — (1) Share amounts shown above include only open market repurchases and do not include shares withheld from employees for tax withholding obligations related to restricted stock vestings, which were 19,001, 27,700 and 22,981 shares for 2020, 2019 and 2018, respectively.
Dividends Declared	Cash dividends declared by the Board and paid by the Company consisted of the following during the periods indicated: Year Ended December 31, 2020 2019 2018 Total quarterly cash dividends declared, per share $ 0.70 $ 2.80 $ 2.80 Total cash dividends paid (in thousands) 11,361 45,552 45,247

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value On a Recurring Basis	Financial instruments measured at fair value on a recurring basis: As of December 31, 2020 As of December 31, 2019 (in thousands) Total Level 1 Level 2 Total Level 1 Level 2 Cash equivalents Money market funds $ 5,340 $ 5,340 $ — $ 42,653 $ 42,653 $ — Commercial paper 48,908 — 48,908 5,807 — 5,807 Municipal debt securities 34,338 — 34,338 1,202 — 1,202 Federal agency debt securities 51,400 — 51,400 — — — Total cash equivalents 139,986 5,340 134,646 49,662 42,653 7,009 Short-term Commercial paper 229,821 — 229,821 161,286 — 161,286 Corporate debt securities 166,768 — 166,768 145,975 — 145,975 Federal agency debt securities 48,598 — 48,598 13,515 — 13,515 Municipal debt securities 87,290 — 87,290 12,237 — 12,237 US Treasury Bonds — — — 2,915 — 2,915 Total short-term 532,477 — 532,477 335,928 — 335,928 Long-term Corporate debt securities — — — 15,396 — 15,396 US Treasury Bonds — — — 146 — 146 Total long-term — — — 15,542 — 15,542 Total financial instruments $ 672,463 $ 5,340 $ 667,123 $ 401,132 $ 42,653 $ 358,479
Debt Instrument, Fair Value Disclosure	Carrying value and estimated fair value of long-term debt, including current maturities and without reduction for related costs: As of December 31, 2020 As of December 31, 2019 (in thousands) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Fair Value Level Non-publicly held debt $ 1,555,637 $ 1,191,008 $ 1,329,882 $ 1,140,232 3

Income Taxes Income Taxes (Tabl

Income Taxes Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign	The components of income before taxes for domestic and foreign operations consisted of the following: Year ended December 31, (in thousands) 2020 2019 2018 Domestic $ (361,242) $ 299,330 $ 195,843 Foreign 175 1,917 3,475 Total $ (361,067) $ 301,247 $ 199,318
Schedule of Components of Income Tax Expense (Benefit)	The provision for income taxes is composed of the following: Year ended December 31, (in thousands) 2020 2019 2018 Current: Federal $ (195,572) $ (34) $ (3,707) State (211) 505 (650) Foreign 132 530 1,086 Total current (195,651) 1,001 (3,271) Deferred: Federal 24,126 63,430 41,593 State (5,449) 4,699 3,744 Foreign — — (4,550) Total deferred 18,677 68,129 40,787 Total income tax provision $ (176,974) $ 69,130 $ 37,516
Schedule of Effective Income Tax Rate Reconciliation	The effective tax rate on income before income taxes differed from the federal statutory income tax rate as follows: Year ended December 31, (in thousands) 2020 2019 2018 Income tax expense at federal statutory rate $ (70,459) $ 63,262 $ 41,857 State income taxes, net of federal income tax benefit (5,495) 5,070 3,560 CARES Act (97,988) — — Foreign income tax expense 132 530 (3,464) Other (3,164) 268 (4,437) Total income tax expense $ (176,974) $ 69,130 $ 37,516
Schedule of Deferred Tax Assets and Liabilities	The major components of the Company’s net deferred tax assets and liabilities are as follows: As of December 31, (in thousands) 2020 2019 Deferred tax assets: Accrued vacation $ 1,024 $ 907 Accrued bonus — 5,523 State taxes — 88 Accrued property taxes 1,111 1,742 Stock-based compensation expense 1,025 1,415 Net operating loss 15,979 58,066 Tax credit 10,995 — Less: valuation allowance 1,214 1,193 Total deferred tax assets 28,920 66,548 Deferred tax liabilities: Prepaid expenses 2,517 6,211 Depreciation 308,266 278,554 Other 20,242 14,522 Total deferred tax liabilities 331,025 299,287 Net deferred tax liabilities $ 302,105 $ 232,739
Summary of Income Tax Contingencies	The reconciliation of the Company's tax contingencies is as follows: As of December 31, (in thousands) 2020 2019 2018 Beginning Balance $ 3,970 $ 4,175 $ 778 Increases for tax position of prior years — — 3,364 Increases for tax position of current year — 146 293 Decreases for tax positions of prior years (3,602) (135) (10) Settlements (26) (216) (110) Decreases for lapses in statute of limitations — — (140) Ending Balance $ 342 $ 3,970 $ 4,175

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2020
Employee Benefit Plans [Abstract]
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]	The following table provides information about the Company’s ESPP activity during 2020, 2019, and 2018: Total number of shares purchased in year Average price paid per share Weighted-average fair value of discount under the ESPP (1) As of December 31, 2018 33,300 $ 134.31 $ 16.79 As of December 31, 2019 38,464 $ 133.54 $ 23.51 As of December 31, 2020 56,866 $ 90.63 $ 14.10
Schedule of Share-based Compensation, Stock Options, Activity	A summary of option activity as of December 31, 2020, 2019 and 2018, and changes during the years then ended, is presented below: Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life (years) Aggregate Intrinsic Value (thousands) Outstanding at December 31, 2017 27,575 $ 97.88 0.72 $ 1,568 Exercised (17,838) 92.04 Outstanding at December 31, 2018 9,737 $ 108.59 0.18 $ — Exercised (9,737) 108.59 Outstanding at December 31, 2019 — $ — 0.00 $ — Exercised — — Outstanding at December 31, 2020 — $ — 0.00 $ —
Schedule of Nonvested Restricted Stock Units Activity	A summary of the status of non-vested restricted stock grants during the years ended December 31, 2020, 2019 and 2018 is presented below: Shares Weighted Average Grant Date Fair Value Per Share Non-vested at December 31, 2017 192,890 $ 153.32 Granted 102,842 155.02 Vested (85,410) 153.85 Forfeited (14,128) 154.65 Non-vested at December 31, 2018 196,194 $ 153.88 Granted 218,477 143.72 Vested (104,816) 152.07 Forfeited (15,047) 148.97 Non-vested at December 31, 2019 294,808 $ 147.25 Granted 267,169 137.80 Vested (291,303) 147.58 Forfeited (5,147) 145.82 Non-vested at December 31, 2020 265,527 $ 142.25
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques	The following range of assumptions in the Black-Scholes pricing model was used to determine fair value as of December 31 of the years indicated below (all cash-settled SARs were fully vested as of December 31, 2019): 2020 2019 2018 Weighted-average volatility — % — % 35.0 % Expected term (in years) N/A N/A 0.8 Risk-free interest rate — % — % 2.6 % Dividend yield — % — % 1.68 %
Schedule Of Cash Settled Stock Appreciation Rights Activity	A summary of cash-settled SARs awards activity during the years ended December 31, 2020, 2019 and 2018 is presented below: # of SARs Weighted Average Exercise Price Weighted Average Remaining Contractual Term (years) Aggregate Intrinsic Value (thousands) Balance at December 31, 2017 80,464 $ 155.13 Forfeited (12,890) 181.47 Exercised (13,642) 98.37 Balance at December 31, 2018 53,932 $ 163.19 Exercised (9,886) 135.53 Balance at December 31, 2019 44,046 $ 169.40 Forfeited (29,046) 181.47 Exercised (15,000) 186.85 Balance at December 31, 2020 — $ — 0.00 $ — Vested at December 31, 2020 — $ — 0.00 $ — Exercisable at December 31, 2020 — $ — 0.00 $ —

Commitments and Contingencies S

Commitments and Contingencies Schedule of Future Minimum Payments (Tables)	12 Months Ended
	Dec. 31, 2020
Schedule of Future Minimum Payments [Abstract]
Contractual Obligation, Fiscal Year Maturity Schedule	The Company's contractual purchase commitments consist primarily of aircraft and engine acquisitions. The total future commitments are as follows: (in thousands) As of December 31, 2020 2021 65,900 2022 21,000 Total purchase commitments $ 86,900

Commitments and Contingencies C

Commitments and Contingencies Collective Bargaining (Tables)	12 Months Ended
	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Employees Under Collective Bargaining Agreements [Table Text Block]	The Company is party to collective bargaining agreements with the employee groups listed below. As of December 31, 2020 the percentage of full-time equivalent employees for these pay groups were as follows: As of December 31, 2020 Flight Attendants 36.1 % Pilots 23.2 Flight Dispatchers 1.1 Total 60.3 %

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts (Tables)	12 Months Ended
	Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Schedule Of Valuation And Qualifying Accounts	(in thousands) Balance at Beginning of Year Changes Charged to Statement of Income Accounts Write Offs (net of recoveries) Balance at End of Year Allowance for expendable parts and supplies For the Year Ended December 31, 2020 $ 2,748 $ 1,575 $ — $ 4,323 For the Year Ended December 31, 2019 (1) 14,410 2,257 (13,919) 2,748 For the Year Ended December 31, 2018 13,756 2,624 (1,970) 14,410 (1) Increase in write offs mostly related to disposal of MD-80 fleet parts in 2019.

Operating Segment (Tables)

Operating Segment (Tables)	12 Months Ended
	Dec. 31, 2020
Asset Held for Sale [Abstract]
Disclosure of Long Lived Assets Held-for-sale [Table Text Block]	In July 2019, management began evaluating strategic alternatives for Teesnap, and its business-to-business software as a service offering. As the Company's current strategy has a business to customer focus, rather than business to business, management determined that the best course of action for both entities would be to sell Teesnap and management is actively pursuing this avenue.
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Selected information for the Company's segments and the reconciliation to the consolidated financial statement amounts are as follows: (in thousands) Airline Sunseeker Resort Other non - airline Consolidated Year Ended December 31, 2020 Operating revenue: Passenger $ 902,187 $ — $ — $ 902,187 Third party products 46,482 — — 46,482 Fixed fee contract 26,865 — — 26,865 Other 1,462 650 12,427 14,539 Operating income (loss) (104,745) (145,721) (30,519) (280,985) Interest expense, net 50,355 562 — 50,917 Depreciation and amortization 174,882 615 770 176,267 Capital expenditures 262,748 45,160 442 308,350 Year Ended December 31, 2019 Operating revenue: Passenger $ 1,682,955 $ — $ — $ 1,682,955 Third party products 70,012 — — 70,012 Fixed fee contract 65,057 — — 65,057 Other 4,474 2,048 16,419 22,941 Operating income (loss) 388,740 (6,588) (18,202) 363,950 Interest expense, net 58,112 1,694 — 59,806 Depreciation and amortization 151,060 1,250 3,542 155,852 Capital expenditures 438,765 66,659 18,304 523,728 Year Ended December 31, 2018 Operating revenue: Passenger $ 1,533,701 $ — $ — $ 1,533,701 Third party products 58,060 — — 58,060 Fixed fee contract 50,286 — — 50,286 Other 17,125 601 7,674 25,400 Operating income (loss) 255,888 (3,299) (9,130) 243,459 Interest expense, net 44,534 2 — 44,536 Depreciation and amortization 127,460 129 1,762 129,351 Capital expenditures 290,998 32,635 16,657 340,290 Total assets were as follows as of the dates indicated: (in thousands) As of December 31, 2020 As of December 31, 2019 Airline $ 3,214,523 $ 2,830,236 Sunseeker Resort 36,612 133,362 Other non-airline 7,790 47,205 Consolidated $ 3,258,925 $ 3,010,803

Organization and Business of _2

Organization and Business of Company - Narrative (Details)	12 Months Ended
	Dec. 31, 2020segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	1

Unusual or Infrequently Occur_2

Unusual or Infrequently Occurring Items (Details)	Apr. 20, 2020$ / shares	Mar. 31, 2020USD ($)	Sep. 30, 2020USD ($)shares	Dec. 31, 2020USD ($)	Dec. 31, 2020USD ($)Aircraft	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Apr. 30, 2025	Dec. 27, 2020USD ($)
Unusual or Infrequent Item, or Both [Line Items]
Proceeds from Government Assistance, Payroll Support Program, CARES Act			$ 176,900,000
Proceeds From Payroll Support Program, Low-Interest Loan			$ 23,100,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares			27,681
Debt Instrument, Term	10 years
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 83.33
Total Proceeds To Be Provided to U.S. Airlines From Payroll Support Program Extension									$ 15,000,000,000
Operating Special Charge, Total					$ 306,299,000
Non-Operating Special Charge, Total					26,632,000
Special Charges, Total					332,931,000
Special charges					161,600,000	$ 0	$ 0
Other Aircraft Related Costs					$ 98,000,000
Number of Aircraft Retired | Aircraft					8
Number of Engines Retired | Aircraft					5
Number of Aircraft In Sale-Leaseback Transactions | Aircraft					8
Postemployment Benefits, Period Expense					$ 35,100,000
Termination Loans				$ 19,800,000	19,800,000
Other Expenses					$ 6,600,000
Proceeds Received From Payroll Support Program			$ 153,800,000
Fair Value of Common Stock Called by Warrants			1,400,000
Unsecured Debt | Payroll Support Program Loan CARES Act [Member]
Unusual or Infrequent Item, or Both [Line Items]
Proceeds From Payroll Support Program, Low-Interest Loan			$ 23,100,000
Subsequent Event | Unsecured Debt | Payroll Support Program Loan CARES Act [Member]
Unusual or Infrequent Item, or Both [Line Items]
Debt Instrument, Interest Rate Terms								five years
COVID19 [Member]
Unusual or Infrequent Item, or Both [Line Items]
Unusual Or Infrequent Item, Reduction Of Salary				50.00%	50.00%
Allegiant Air
Unusual or Infrequent Item, or Both [Line Items]
Operating Special Charge					$ 141,713,000
Non-Operating Special Charge					0
Special Charges, Total					141,713,000
Special charges					5,000,000
Postemployment Benefits, Period Expense					32,100,000
Sunseeker Resorts
Unusual or Infrequent Item, or Both [Line Items]
Operating Special Charge					137,994,000
Non-Operating Special Charge					26,632,000
Special Charges, Total					164,626,000
Special charges		$ 128,900,000		$ 0
Postemployment Benefits, Period Expense					2,900,000
Construction Suspension Expense					5,000,000
Other
Unusual or Infrequent Item, or Both [Line Items]
Operating Special Charge					26,592,000
Non-Operating Special Charge					0
Special Charges, Total					26,592,000
Special charges					$ 26,600,000
Kingsway Golf
Unusual or Infrequent Item, or Both [Line Items]
Special charges		$ 1,100,000

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - (Details)	12 Months Ended
	Dec. 31, 2020
Building | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	10.00
Building | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	25.00
Equipment And Leasehold Improvements | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3.00
Equipment And Leasehold Improvements | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	10.00
Computer Hardware and Software | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3.00
Property, Plant and Equipment, Useful Life	3 years
Computer Hardware and Software | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	10.00
Property, Plant and Equipment, Useful Life	10 years
Airbus A320 Aircraft Series | Aircraft And Engines | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	10.00
Airbus A320 Aircraft Series | Aircraft And Engines | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	25.00

Summary of Significant Accoun_5

Summary of Significant Accounting Policies Basis (Details)	Dec. 31, 2020
Accounting Policies [Abstract]
Equity Method Investment, Ownership Percentage	50.00%

Summary of Significant Accoun_6

Summary of Significant Accounting Policies Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Receivables [Abstract]
Accounts Receivable, before Allowance for Credit Loss, Noncurrent	$ 10.9	$ 11.4

Summary of Significant Accoun_7

Summary of Significant Accounting Policies Expendable Parts, Supplies and Fuel (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Expendable Parts, Supplies and Fuel [Abstract]
Inventory Valuation Reserves	$ 4.3	$ 2.7

Summary of Significant Accoun_8

Summary of Significant Accounting Policies Interest Costs Capitalized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Cost [Abstract]
Capitalized interest	$ 4,067	$ 4,472	$ 2,354

Summary of Significant Accoun_9

Summary of Significant Accounting Policies Software Capitalization (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Capitalized Computer Software [Abstract]
Capitalized Computer Software, Net	$ 42.3	$ 55.7
Capitalized Computer Software, Amortization	$ 9.6	$ 12.2	$ 14.1

Summary of Significant Accou_10

Summary of Significant Accounting Policies Aircraft Maintenance and Repair Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
A320 Series Engine
Servicing Asset at Amortized Cost [Line Items]
Deferred Costs for Heavy Maintenance	$ 12.8	$ 64.1
Amortization of Other Deferred Charges	17.6	11.1
Airbus A320 Aircraft Series
Servicing Asset at Amortized Cost [Line Items]
Deferred Costs for Heavy Maintenance	22.6	18.4
Amortization of Other Deferred Charges	$ 19.9	$ 14.9

Summary of Significant Accou_11

Summary of Significant Accounting Policies Advertising Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Advertising Expense	$ 12.4	$ 29.1	$ 28.8

Summary of Significant Accou_12

Summary of Significant Accounting Policies Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	24,004	19,928	77,037
Net income (loss)	$ (184,093)	$ 232,117	$ 161,802
Less net income (loss) allocated to participating securities	(236)	(3,413)	(2,106)
Net income (loss) attributable to common stock	$ (184,329)	$ 228,704	$ 159,696
Earnings (loss) per share, basic	$ (11.53)	$ 14.27	$ 10.02
Weighted-average shares outstanding	15,992,000	16,027,000	15,941,000
Less net income (loss) allocated to participating securities	$ (236)	$ (3,410)	$ (2,104)
Net income (loss) attributable to common stock	$ (184,329)	$ 228,707	$ 159,698
Earnings (loss) per share, diluted	$ (11.53)	$ 14.26	$ 10
Dilutive effect of stock options and restricted stock	0	51,000	53,000
Adjusted weighted-average shares outstanding under treasury stock method	15,992,000	16,078,000	15,994,000
Participating securities excluded under two-class method	0	(37,000)	(27,000)
Adjusted weighted-average shares outstanding under two-class method	15,992,000	16,041,000	15,967,000

Summary of Significant Accou_13

Summary of Significant Accounting Policies Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets, net	$ 115,911	$ 22,081	$ 18,000
Operating Lease, Liability	$ 116,602		$ 19,100

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Passenger Revenue	$ 902,187	$ 1,682,955	$ 1,533,701
Contract with Customer, Liability, Forward Bookings	27.90%
Contract with Customer, Liability, Credit Voucher Bookings	72.10%
Air Traffic Liability, Recognized	$ 201,000
Air Traffic Liability, Current		250,000
Revenue from Contract with Customer, Duration	12 months
Scheduled Service Revenue
Disaggregation of Revenue [Line Items]
Passenger Revenue	$ 435,668	897,631	898,653
Air-related revenue
Disaggregation of Revenue [Line Items]
Passenger Revenue	453,545	770,206	621,939
Co-brand Revenue
Disaggregation of Revenue [Line Items]
Passenger Revenue	$ 12,974	$ 15,118	$ 13,109

Revenue Recognition Points Liab

Revenue Recognition Points Liability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract with Customer, Liability	$ 21,841	$ 15,613	$ 10,708
Points awarded	19,202	20,023
Points redeemed	(12,974)	(15,118)
Points Liability	$ 10,900	$ 11,600

Property and Equipment (Details

Property and Equipment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)Aircraft	Dec. 31, 2019USD ($)
Property, Plant and Equipment [Line Items]
Flight Equipment, Gross	$ 2,331,499	$ 2,289,157
Computer Hardware and Software	149,727	171,516
Land and buildings/leasehold improvements	87,030	98,885
Property, Plant and Equipment, Other, Gross	80,601	161,760
Property, Plant and Equipment, Gross	2,648,857	2,721,318
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	(598,546)	(484,510)
Property, Plant and Equipment, Net	2,050,311	2,236,808
Capital Expenditures Incurred but Not yet Paid	16,900	$ 16,500
Building
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Long Lived, Carrying Value	$ 4,800
Capital Addition Purchase Commitments | Airbus A320 Aircraft Series
Property, Plant and Equipment [Line Items]
Number Of Aircraft Committed To Purchase | Aircraft	3

Accrued Liabilities (Details)

Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Liabilities, Current [Abstract]
Salaries, wages and benefits	$ 21,878	$ 44,441
Sunseeker Resort development	14,084	15,209
Passenger taxes and fees	4,686	14,653
Station expenses	10,526	14,573
Maintenance and repairs	12,847	12,713
Property taxes	9,042	12,272
Loyalty card program liability	10,929	11,567
Interest	6,560	6,514
Advertising accruals	890	3,303
Other accruals	24,651	23,786
Total accrued liabilities	$ 116,093	$ 159,031

Long-Term Debt (Detail)

Long-Term Debt (Detail)	Apr. 20, 2020	Feb. 13, 2020USD ($)	Jul. 31, 2019USD ($)	Feb. 28, 2019USD ($)	Sep. 30, 2020USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2020USD ($)Aircraft	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Apr. 20, 2030	Oct. 31, 2020USD ($)	Apr. 30, 2020USD ($)Aircraft	Mar. 31, 2020USD ($)	Oct. 31, 2019USD ($)Aircraft	Mar. 31, 2019USD ($)Aircraft	Feb. 01, 2019USD ($)	Sep. 30, 2018USD ($)Aircraft
Consolidated Variable Interest Entity
Debt, Weighted Average Interest Rate														3.20%	3.80%		4.00%
PP&E from VIEs																	$ 37,800,000
Consolidated Variable Interest Entity | Variable Interest Entity, Primary Beneficiary [Member]
Liabilities														$ 23,500,000	$ 44,000,000		$ 44,000,000
PP&E from VIEs														$ 18,600,000	$ 38,500,000
Consolidated Variable Interest Entity | Airbus A320 Aircraft Series
Number Of Aircrafts Included As Collateral | Aircraft														1	1		1
Senior Secured Revolving Credit Facility
Debt Instrument, Face Amount											$ 150,000,000
Line of Credit Facility, Maximum Borrowing Capacity						$ 81,000,000
Line of Credit Facility, Fair Value of Amount Outstanding								$ 81,000,000
Debt Instrument, Term						24 months
Line of Credit Facility, Periodic Payment, Principal							$ 27,100,000
Line of Credit Facility, Remaining Borrowing Capacity							$ 53,900,000
Unsecured Debt
Repayments of Unsecured Debt				$ 347,900,000
Unsecured Debt | Payroll Support Program Loan CARES Act [Member]
Debt Instrument, Interest Rate, Stated Percentage							1.00%
Proceeds From Payroll Support Program, Low-Interest Loan					$ 23,100,000
Debt Instrument, Face Amount		$ 545,500,000			84,000,000							$ 31,000,000				$ 450,000,000
Debt Instrument, Increase (Decrease), Net		$ 100,000,000
Total long-term debt and finance lease obligations, net of related costs							$ 1,659,011,000	1,421,853,000
Long-term Debt, Current Maturities							217,234,000	173,274,000
Long-term Debt, Excluding Current Maturities							1,441,777,000	1,248,579,000
Number Of Aircrafts Included As Collateral | Aircraft												2
Repayments of Unsecured Debt			$ 102,100,000
Line of Credit Facility, Maximum Borrowing Capacity													$ 175,000,000
Line of Credit Facility, Fair Value of Amount Outstanding							0
Debt Instrument, Term	10 years
Debt Instrument, Periodic Payment, Principal				1,400,000
Gain (Loss) on Extinguishment of Debt				$ (3,700,000)			$ (1,222,000)	(3,677,000)	$ 0
Number of Terms to be Included in the Collateral Pool						2 years
Capital Leased Assets, Number of Units | Aircraft							6
Liabilities							$ 2,559,562,000	2,127,252,000
PP&E from VIEs							3,258,925,000	3,010,803,000
Termination Loans							19,800,000
Proceeds From Payroll Support Program, Low-Interest Loan					$ 23,100,000
Variable Interest Entity, Primary Beneficiary [Member]
PP&E from VIEs							187,166,000	195,796,000
Fixed Rate
Notes Payable							$ 525,240,000	$ 235,071,000
Long-term Debt, Weighted Average Interest Rate, at Point in Time							5.70%	3.70%
Variable Rate
Notes Payable							$ 1,133,771,000	$ 1,186,782,000
Long-term Debt, Weighted Average Interest Rate, at Point in Time							2.40%	4.50%
Payroll Support Program Loan CARES Act [Member] | Forecast [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument, Basis Spread on Variable Rate										2.00%
Senior Secured Notes due 2024 [Member]
Debt Instrument, Interest Rate, Stated Percentage							8.50%
Senior Secured Revolving Credit Facility
Number Of Aircrafts Included As Collateral | Aircraft							6
Long-term Debt
reduction in debt interest rate		15000.00%

Long-Term Debt - Components of

Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Components of Long-Term Debt [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 217,234
Long-term Debt, Maturities, Repayments of Principal in Year Two	137,252
Long-term Debt, Maturities, Repayments of Principal in Year Three	136,781
Long-term Debt, Maturities, Repayments of Principal in Year Four	806,383
Long-term Debt, Maturities, Repayments of Principal in Year Five	89,194
Long-term Debt, Maturities, Repayments of Principal after Year Five	272,167
Secured Long-term Debt, Noncurrent	1,659,011	$ 1,421,853
Debt Issuance Costs, Net	$ 23,500	$ 23,600

Lease (Details)

Lease (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)Aircraft	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Leases [Abstract]
Operating Leases, Rent Expense	$ 24,600	$ 15,000	$ 12,700
Capital Leased Assets, Number of Units | Aircraft	6
operating right of use asset, net	$ 115,911	22,081
Finance Lease, Right-of-Use Asset	133,175	111,665
Total Right-of-Use Asset	249,086	133,746
Current operating lease liabilities	14,313	2,662
Finance Lease, Liability, Current	9,767	7,666
Noncurrent operating lease liabilities	102,289	21,290
Finance Lease, Liability, Noncurrent	117,060	107,930
Total Lease Liability	$ 243,429	$ 139,548
Operating Lease, Weighted Average Discount Rate, Percent	5.40%	4.30%
Finance Lease, Weighted Average Discount Rate, Percent	5.00%	4.40%
Operating Lease, Weighted Average Remaining Lease Term	8 years 3 months 18 days	9 years 1 month 6 days
Finance Lease, Weighted Average Remaining Lease Term	7 years 7 months 6 days	9 years 10 months 24 days
Number of Aircraft In Sale-Leaseback Transactions | Aircraft	8
Proceeds from sale-leaseback transactions	$ 87,580	$ 0	$ 0
Sale and Leaseback Transaction, Gain (Loss), Net	$ 53,200

Lease Lease Costs (Details)

Lease Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 6,631	$ 6,517
Finance Lease, Interest Payment on Liability	5,335	5,264
Operating Lease, Cost	12,616	3,541
Variable Lease, Cost	3,560	2,274
Lease, Cost	$ 28,142	$ 17,596

Lease Cash paid for lease (Deta

Lease Cash paid for lease (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for lease [Abstract]
Operating Lease, Payments	$ 13,102	$ 2,927
Finance Lease, Interest Payment on Liability	5,335	5,264
Finance Lease, Principal Payments	$ 15,908	$ 7,336

Lease Scheduled Lease Payments

Lease Scheduled Lease Payments Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Scheduled Lease Payments Commitments [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 20,055
Lessee, Operating Lease, Liability, Payments, Due Year Two	20,313
Lessee, Operating Lease, Liability, Payments, Due Year Three	20,160
Lessee, Operating Lease, Liability, Payments, Due Year Four	19,853
Lessee, Operating Lease, Liability, Payments, Due Year Five	17,723
Lessee, Operating Lease, Liability, Payments, Due after Year Five	44,486
Lessee, Operating Lease, Liability, Payments, Due	142,590
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	25,988
Operating Lease, Liability	116,602		$ 19,100
Current operating lease liabilities	14,313	$ 2,662
Noncurrent operating lease liabilities	102,289	21,290
Finance Lease, Liability, to be Paid, Year One	15,871
Finance Lease, Liability, Payments, Due Year Two	14,366
Finance Lease, Liability, Payments, Due Year Three	26,045
Finance Lease, Liability, Payments, Due Year Four	10,500
Finance Lease, Liability, Payments, Due Year Five	10,500
Finance Lease, Liability, Payments, Due after Year Five	82,458
Finance Lease, Liability, Payment, Due	159,740
Finance Lease, Liability, Undiscounted Excess Amount	(32,913)
Finance Lease, Liability	126,827
Finance Lease, Liability, Current	(9,767)	(7,666)
Finance Lease, Liability, Noncurrent	$ 117,060	$ 107,930

Stockholders' Equity (Detail)

Stockholders' Equity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Repurchased During Period, Shares	197,570	103,943	0
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)	$ 155.14	$ 141.64
Stock Repurchased During Period, Value	$ 30,651	$ 14,723	$ 0
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	19,001	27,700	22,981
Dividends Payable, Amount Per Share	$ 0.70	$ 2.80	$ 2.80
Dividends	$ 11,361	$ 45,552	$ 45,247

Fair Value Measurements (Detail

Fair Value Measurements (Detail) - Fair Value Measurements at Reporting Date Using - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Investment Securities	$ 672,463	$ 401,132
Short-term investments
Investment Securities	532,477	335,928
Long-term investments
Investment Securities	0	15,542
Fair Value, Inputs, Level 1
Investment Securities	5,340	42,653
Fair Value, Inputs, Level 1 | Short-term investments
Investment Securities	0	0
Fair Value, Inputs, Level 1 | Long-term investments
Investment Securities	0	0
Fair Value, Inputs, Level 2
Investment Securities	667,123	358,479
Fair Value, Inputs, Level 2 | Short-term investments
Investment Securities	532,477	335,928
Fair Value, Inputs, Level 2 | Long-term investments
Investment Securities	0	15,542
Commercial paper | Short-term investments
Investment Securities	229,821	161,286
Commercial paper | Fair Value, Inputs, Level 1 | Short-term investments
Investment Securities	0	0
Commercial paper | Fair Value, Inputs, Level 2 | Short-term investments
Investment Securities	229,821	161,286
US Government Corporations and Agencies Securities | Short-term investments
Investment Securities	48,598	13,515
US Government Corporations and Agencies Securities | Fair Value, Inputs, Level 1 | Short-term investments
Investment Securities	0	0
US Government Corporations and Agencies Securities | Fair Value, Inputs, Level 2 | Short-term investments
Investment Securities	48,598	13,515
US Treasury Securities | Short-term investments
Investment Securities	0	2,915
US Treasury Securities | Long-term investments
Investment Securities	0	146
US Treasury Securities | Fair Value, Inputs, Level 1 | Short-term investments
Investment Securities	0	0
US Treasury Securities | Fair Value, Inputs, Level 1 | Long-term investments
Investment Securities	0	0
US Treasury Securities | Fair Value, Inputs, Level 2 | Short-term investments
Investment Securities	0	2,915
US Treasury Securities | Fair Value, Inputs, Level 2 | Long-term investments
Investment Securities	0	146
Municipal debt securities | Short-term investments
Investment Securities	87,290	12,237
Municipal debt securities | Fair Value, Inputs, Level 1 | Short-term investments
Investment Securities	0	0
Municipal debt securities | Fair Value, Inputs, Level 2 | Short-term investments
Investment Securities	87,290	12,237
Corporate debt securities | Short-term investments
Investment Securities	166,768	145,975
Corporate debt securities | Long-term investments
Investment Securities	0	15,396
Corporate debt securities | Fair Value, Inputs, Level 1 | Short-term investments
Investment Securities	0	0
Corporate debt securities | Fair Value, Inputs, Level 1 | Long-term investments
Investment Securities	0	0
Corporate debt securities | Fair Value, Inputs, Level 2 | Short-term investments
Investment Securities	166,768	145,975
Corporate debt securities | Fair Value, Inputs, Level 2 | Long-term investments
Investment Securities	0	15,396
Cash Equivalents
Cash Equivalents	139,986	49,662
Cash Equivalents | Fair Value, Inputs, Level 1
Cash Equivalents	5,340	42,653
Cash Equivalents | Fair Value, Inputs, Level 2
Cash Equivalents	134,646	7,009
Cash Equivalents | Money market funds
Cash Equivalents	5,340	42,653
Cash Equivalents | Money market funds | Fair Value, Inputs, Level 1
Cash Equivalents	5,340	42,653
Cash Equivalents | Money market funds | Fair Value, Inputs, Level 2
Cash Equivalents	0	0
Cash Equivalents | Commercial paper
Cash Equivalents	48,908	5,807
Cash Equivalents | Commercial paper | Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents | Commercial paper | Fair Value, Inputs, Level 2
Cash Equivalents	48,908	5,807
Cash Equivalents | US Government Corporations and Agencies Securities
Cash Equivalents	51,400	0
Cash Equivalents | US Government Corporations and Agencies Securities | Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents | US Government Corporations and Agencies Securities | Fair Value, Inputs, Level 2
Cash Equivalents	51,400	0
Cash Equivalents | Municipal debt securities
Cash Equivalents	34,338	1,202
Cash Equivalents | Municipal debt securities | Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents | Municipal debt securities | Fair Value, Inputs, Level 2
Cash Equivalents	$ 34,338	$ 1,202

Fair Value Measurements Fair Va

Fair Value Measurements Fair Value Measurements Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured Long-term Debt, Noncurrent	$ 1,659,011	$ 1,421,853
Non-Publicly Held Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured Long-term Debt, Noncurrent	1,555,637	1,329,882
Fair Value, Inputs, Level 3 | Non-Publicly Held Debt | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Fair Value	$ 1,191,008	$ 1,140,232

Income Taxes Income Taxes (Deta

Income Taxes Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016	Dec. 31, 2014
Income Tax Disclosure [Abstract]
INCOME TAX PROVISION (BENEFIT)	$ (176,974)	$ 69,130	$ 37,516
Income tax refunds	(95,229)	(2,157)	(41,610)
Net Operating Loss, Carryback	422,100	$ 116,700	$ 185,400
Deferred Tax Assets, Operating Loss Carryforwards	5,200				$ 5,700
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	8,500
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 7,400
Deferred Tax Assets, Tax Credit Carryforwards				$ 700

Income Taxes Components of inco

Income Taxes Components of income/(loss) before income tax expense/(benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ (361,242)	$ 299,330	$ 195,843
Income (Loss) from Continuing Operations before Income Taxes, Foreign	175	1,917	3,475
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	$ (361,067)	$ 301,247	$ 199,318

Income Taxes The Components of

Income Taxes The Components of the Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
The Components of the Provision (Benefit) for Income Taxes [Abstract]
Current Federal Tax Expense (Benefit)	$ (195,572)	$ (34)	$ (3,707)
Current State and Local Tax Expense (Benefit)	(211)	505	(650)
Current Foreign Tax Expense (Benefit)	132	530	1,086
Current Income Tax Expense (Benefit)	(195,651)	1,001	(3,271)
Deferred Federal Income Tax Expense (Benefit)	24,126	63,430	41,593
Deferred State and Local Income Tax Expense (Benefit)	(5,449)	4,699	3,744
Deferred Foreign Income Tax Expense (Benefit)	0	0	(4,550)
DeferredTotalIncomeTaxExpenseBenefit	18,677	68,129	40,787
INCOME TAX PROVISION (BENEFIT)	$ (176,974)	$ 69,130	$ 37,516

Income Taxes Reconciliation of

Income Taxes Reconciliation of the Statutory Income Tax Rate and the Company's Effective Tax Rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of the Statutory Income Tax Rate and the Company's Effective Tax Rate [Abstract]
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate	$ (70,459,000)	$ 63,262,000	$ 41,857,000
Income Tax Reconciliation, State and Local Income Taxes	(5,495,000)	5,070,000	3,560,000
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(97,988,000)	0	0
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	132,000	530,000	(3,464,000)
Income Tax Reconciliation, Other Reconciling Items	(3,164,000)	268,000	(4,437,000)
INCOME TAX PROVISION (BENEFIT)	$ (176,974,000)	$ 69,130,000	$ 37,516,000

Income Taxes The Major Componen

Income Taxes The Major Components of the Company's Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Valuation Allowance
Deferred Income Taxes and Tax Credits	$ 10,995	$ 0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	1,214	1,193
Deferred Tax Assets, Net of Valuation Allowance	28,920	66,548
Deferred Tax Liabilities, Other	20,242	14,522
Accrued Vacation
Valuation Allowance
Deferred Tax Assets, Gross	1,024	907
Deferred Tax Assets, Accrued Bonus
Valuation Allowance
Deferred Tax Assets, Gross	0	5,523
State Taxes
Valuation Allowance
Deferred Tax Assets, State Taxes	0	88
Accrued Property Taxes
Valuation Allowance
Deferred Tax Assets, Gross	1,111	1,742
Stock Based Compensation
Valuation Allowance
Deferred Tax Assets, Gross	1,025	1,415
Valuation Allowance, Operating Loss Carryforwards
Valuation Allowance
Deferred Tax Assets, Gross	15,979	58,066
Prepaid Expenses
Valuation Allowance
Deferred Tax Liabilities, Prepaid Expenses	2,517	6,211
Depreciation
Valuation Allowance
Deferred Tax Liabilities, Other	308,266	278,554
Total Noncurrent
Valuation Allowance
Deferred Tax Liabilities, Gross	331,025	299,287
Total
Valuation Allowance
Deferred Income Tax Liabilities, Net	$ 302,105	$ 232,739

Income Taxes Tax Contingencies

Income Taxes Tax Contingencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingencies [Abstract]
Unrecognized Tax Benefits	$ 342	$ 3,970	$ 4,175	$ 778
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	0	0	3,364
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	0	146	293
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(3,602)	(135)	(10)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(26)	216	110
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	$ 0	$ 0	$ (140)

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 0	$ 0	$ 0

Employee Benefit Plans (Details

Employee Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2020USD ($)$ / sharesshares	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2014USD ($)shares	Dec. 31, 2016shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	90.00%				25.00%
Defined Contribution Plan, Cost | $	$ 18,600,000	$ 19,000,000	$ 19,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares						2,000,000
Shares Held in Employee Stock Option Plan, Allocated | shares					1,000,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount | $					$ 25,000
Share-based compensation expense | $	19,287,000	18,226,000	15,098,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized | $	27,500,000
Cash-settled SARs | $	0
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSARsExercisesInPeriodTotalIntrinsicValue | $	0	200,000	1,400,000
Proceeds from the exercise of stock options | $	$ 0	$ 1,100,000	$ 1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | shares	265,527	294,808	196,194	192,890
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares	267,169	218,477	102,842
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | shares	(291,303)	(104,816)	(85,410)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period | shares	(5,147)	(15,047)	(14,128)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares	$ 142.25	$ 147.25	$ 153.88	$ 153.32
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	137.80	143.72	155.02
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares	147.58	152.07	153.85
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value | $ / shares	$ 145.82	$ 148.97	$ 154.65
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value | $	$ 43,000,000	$ 15,900,000	$ 13,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate	0.00%	0.00%	35.00%
Fair Value Assumptions, Risk Free Interest Rate	0.00%	0.00%	2.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%	1.68%
Stock Appreciation Rights (SARs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exercised (in Shares) | shares	(15,000)	(9,886)	(13,642)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ / shares	$ 186.85	$ 135.53	$ 98.37
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSARsOutstandingIntrinsicValue | $	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term			9 months 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | shares	0	44,046	53,932	80,464
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period | shares	(29,046)		(12,890)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares	$ 0	$ 169.40	$ 163.19	$ 155.13
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price | $ / shares	$ 181.47		$ 181.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | shares	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ / shares	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	0 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value | $	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	0 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	0 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $	$ 0
Share-based Payment Arrangement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Share-based compensation expense | $	$ 20,100,000	$ 19,200,000	$ 15,600,000
Restricted Stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 4 months 2 days
Share-based Payment Arrangement, Option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSARsOutstandingNumber | shares	0	0	9,737	27,575
Exercised (in Shares) | shares	0	(9,737)	(17,838)
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSARsOutstandingWeightedAverageExercisePrice | $ / shares	0	0	108.59	97.88
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | $ / shares	$ 0	$ 108.59	$ 92.04
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsSARsOutstandingWeightedAverageRemainingContractualTerm2	0 years	0 years	2 months 4 days	8 months 19 days
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsSARsOutstandingIntrinsicValue | $	$ 0	$ 0	$ 0	$ 1,568,000
Minimum | Share-based Payment Arrangement, Option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	5 years
Maximum | Share-based Payment Arrangement, Option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	10 years
Employee
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	5.00%
Pilot
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			10.00%
Stock Appreciation Rights (SARs)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Terms of Award	5 years

Employee Benefit Plans Employee

Employee Benefit Plans Employee Stock Purchase Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2014
Postemployment Benefits [Abstract]
Stock Issued During Period, Shares, Employee Stock Purchase Plans	56,866	38,464	33,300
Weighted Average Fair Value Of Stock Purchase Right Under Employee Stock Purchase Plan	$ 90.63	$ 133.54	$ 134.31
Aggregate Cost Of Discount Off Market Value For Shares Available Under Employee Stock Purchase Plan	$ 14.10	$ 23.51	$ 16.79
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date			15.00%	10.00%

Commitments and Contingencies (

Commitments and Contingencies (Detail) $ in Thousands	Dec. 31, 2020USD ($)Aircraft
Long-term Purchase Commitment [Line Items]
Purchase Obligation, Due in Next Twelve Months	$ 65,900
Purchase Obligation, Due in Second Year	21,000
Purchase Obligation	$ 86,900
Airbus A320 Aircraft Series
Long-term Purchase Commitment [Line Items]
Number Of Aircraft Committed To Purchase | Aircraft	5

Commitments and Contingencies_2

Commitments and Contingencies Concentration Risk (Details) - Unionized Employees Concentration Risk	12 Months Ended
	Dec. 31, 2020
Flight Attendants
Concentration Risk [Line Items]
Concentration Risk, Percentage	36.10%
Pilots
Concentration Risk [Line Items]
Concentration Risk, Percentage	23.20%
Flight Dispatchers
Concentration Risk [Line Items]
Concentration Risk, Percentage	1.10%
Total Percentage of Employees
Concentration Risk [Line Items]
Concentration Risk, Percentage	60.30%

Valuation and Qualifying Acco_3

Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 2,748	$ 14,410	$ 13,756
Changes Charged to Statement of Income Accounts	1,575	2,257	2,624
Inventory Write-down	0	(13,919)	(1,970)
Balance at End of Year	$ 4,323	$ 2,748	$ 14,410

Operating Segment (Details)

Operating Segment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments	3
PP&E from VIEs	$ 3,258,925	$ 3,010,803
Passenger	902,187	1,682,955	$ 1,533,701
Third party products	46,482	70,012	58,060
Fixed fee contract	26,865	65,057	50,286
Other	14,539	22,941	25,400
Operating Income (Loss)	(280,985)	363,950	243,459
Interest Revenue (Expense), Net	50,917	59,806	44,536
Depreciation and amortization	176,267	155,852	129,351
Payments to Acquire Productive Assets	308,350	523,728	340,290
Allegiant Air
Segment Reporting Information [Line Items]
PP&E from VIEs	3,214,523	2,830,236
Passenger	902,187	1,682,955	1,533,701
Third party products	46,482	70,012	58,060
Fixed fee contract	26,865	65,057	50,286
Other	1,462	4,474	17,125
Operating Income (Loss)	(104,745)	388,740	255,888
Interest Revenue (Expense), Net	50,355	58,112	44,534
Depreciation and amortization	174,882	151,060	127,460
Payments to Acquire Productive Assets	262,748	438,765	290,998
Sunseeker Resorts
Segment Reporting Information [Line Items]
PP&E from VIEs	36,612	133,362
Other	650	2,048	601
Operating Income (Loss)	(145,721)	(6,588)	(3,299)
Interest Revenue (Expense), Net	562	1,694	2
Depreciation and amortization	615	1,250	129
Payments to Acquire Productive Assets	45,160	66,659	32,635
Other
Segment Reporting Information [Line Items]
PP&E from VIEs	7,790	47,205
Other	12,427	16,419	7,674
Operating Income (Loss)	(30,519)	(18,202)	(9,130)
Interest Revenue (Expense), Net	0	0	0
Depreciation and amortization	770	3,542	1,762
Payments to Acquire Productive Assets	$ 442	$ 18,304	$ 16,657

Impairment (Details)

Impairment (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Special charges			$ 161,600,000	$ 0	$ 0
Long-Lived Assets		$ 0	0
Allegiant Air
Segment Reporting Information [Line Items]
Special charges			5,000,000
Sunseeker Resorts
Segment Reporting Information [Line Items]
Special charges	$ 128,900,000	0
Other
Segment Reporting Information [Line Items]
Special charges			26,600,000
Other | Allegiant Nonstop
Segment Reporting Information [Line Items]
Special charges	18,300,000	$ 0
Other | Teesnap
Segment Reporting Information [Line Items]
Special charges	8,300,000
Kingsway Golf
Segment Reporting Information [Line Items]
Special charges	$ 1,100,000
Airbus A320 Aircraft Series | Allegiant Air
Segment Reporting Information [Line Items]
Special charges			$ 0

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Jan. 15, 2021	Dec. 24, 2020	Sep. 30, 2020	Apr. 20, 2020
Subsequent Event [Line Items]
Proceeds Received From Payroll Support Program				$ 153.8
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 83.33
Percent of Securities to be Issued Based on Amount of Note Issued		10.00%
Payroll Support Program Grant Extension [Member]
Subsequent Event [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 179.23
Subsequent Event | Payroll Support Program Grant Extension [Member]
Subsequent Event [Line Items]
Increase In Debt Instrument For Additional Installment		30.00%
Debt Instrument, Amount Need To Exceed To Disburse Note		$ 100
Subsequent Event | Payroll Support Program Grant Extension [Member]
Subsequent Event [Line Items]
Proceeds Received From Payroll Support Program		$ 45.9
Proceeds Expected From Payroll Support Program	$ 91.8