Allegiant Travel (ALGT) 10-Q 31 Jul 19 2019 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Jul. 15, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-33166
Entity Registrant Name	Allegiant Travel Co
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, par value $.001
Trading Symbol	ALGT
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	true
Entity Common Stock, Shares Outstanding		16,306,083
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Entity Central Index Key	0001362468
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.001	$ 0.001
CURRENT ASSETS
Cash and cash equivalents	$ 453,852	$ 81,520
Restricted cash	14,318	14,391
Short-term investments	216,746	314,464
Accounts receivable	36,100	36,014
Expendable parts, supplies and fuel, net	25,131	19,516
Prepaid expenses and other current assets	34,100	29,343
TOTAL CURRENT ASSETS	780,247	495,248
Property and equipment, net	2,019,774	1,847,268
Long-term investments	24,704	51,526
Deferred major maintenance, net	89,868	67,873
Operating lease right-of-use assets, net	22,233	0
Deposits and other assets	45,374	36,753
TOTAL ASSETS:	2,982,200	2,498,668
CURRENT LIABILITIES
Accounts payable	32,097	27,452
Accrued liabilities	147,483	122,027
Air traffic liability	267,050	212,230
Current maturities of long-term debt and finance lease obligations, net of related costs	160,523	152,287
TOTAL CURRENT LIABILITIES	607,153	513,996
Long-term debt and finance lease obligations, net of current maturities and related costs	1,338,734	1,119,446
Deferred income taxes	199,689	164,027
Other noncurrent liabilities	32,115	10,878
TOTAL LIABILITIES:	2,177,691	1,808,347
SHAREHOLDERS' EQUITY
Common stock, par value $.001	23	23
Treasury shares	(605,115)	(605,037)
Additional paid in capital	280,783	270,935
Accumulated other comprehensive loss, net	(4)	(661)
Retained earnings	1,128,822	1,025,061
TOTAL EQUITY:	804,509	690,321
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY:	$ 2,982,200	$ 2,498,668

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
OPERATING REVENUES:
Passenger	$ 454,779	$ 405,572	$ 874,755	$ 802,343
Third party products	18,208	17,799	35,350	28,124
Fixed fee contracts	12,487	7,653	23,061	18,209
Other	6,285	5,756	10,215	13,548
Total operating revenues	491,759	436,780	943,381	862,224
OPERATING EXPENSES:
Salary and benefits	113,592	101,645	233,003	214,608
Aircraft fuel	119,987	122,454	219,670	228,481
Station operations	45,870	41,553	84,835	79,137
Maintenance and repairs	20,877	24,611	43,701	43,881
Depreciation and amortization	38,494	29,833	74,676	57,983
Sales and marketing	20,540	18,348	41,466	37,426
Aircraft lease rental	0	75	0	96
Other Cost and Expense, Operating	24,294	24,039	46,849	46,422
Total operating expenses	383,654	362,558	744,200	708,034
OPERATING INCOME	108,105	74,222	199,181	154,190
OTHER (INCOME) EXPENSES:
Interest expense	20,942	13,251	39,025	26,158
Interest Costs Capitalized	(1,038)	(95)	(2,541)	(278)
Interest income	(3,502)	(1,927)	(6,703)	(3,834)
Gain (Loss) on Extinguishment of Debt	0	0	3,677	0
Other, net	(86)	(50)	15	(290)
Total other expenses	16,316	11,179	33,473	21,756
INCOME BEFORE INCOME TAXES	91,789	63,043	165,708	132,434
PROVISION FOR INCOME TAXES	21,246	13,027	38,041	27,225
NET INCOME	$ 70,543	$ 50,016	$ 127,667	$ 105,209
Earnings per share to common shareholders:
Basic	$ 4.33	$ 3.10	$ 7.85	$ 6.53
Earnings Per Share, Diluted	$ 4.33	$ 3.10	$ 7.84	$ 6.52
Shares used for computation:
Basic	16,063,000	15,939,000	16,037,000	15,898,000
Diluted	16,069,000	15,945,000	16,050,000	15,914,000
Cash dividends declared per share:	$ 0.70	$ 0.70	$ 1.40	$ 1.40

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 70,543	$ 50,016	$ 127,667	$ 105,209
Other comprehensive income:
Change in available for sale securities, net of tax	177	113	654	(843)
Foreign currency translation adjustments	9	113	3	214
Change in derivatives, net of tax	0	1,260	0	996
Total other comprehensive income	186	1,486	657	367
TOTAL COMPREHENSIVE INCOME	$ 70,729	$ 51,502	$ 128,324	$ 105,576

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Adjustments to reconcile net income to net cash provided by operating activities:
NET INCOME	$ 127,667	$ 105,209
Depreciation and amortization	74,676	57,983
Gain on aircraft and other equipment disposals	(8,294)	(1,491)
Share-based compensation expense	9,128	6,106
Deferred income taxes	35,634	25,241
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	5,199	1,237
Changes in certain assets and liabilities:
Accounts receivable	(86)	46,873
Prepaid expenses	(4,257)	(10,516)
Accounts payable	4,449	7,631
Accrued liabilities	14,681	20,859
Increase (Decrease) in Air Traffic Liability	54,820	32,633
Deferred major maintenance	(31,591)	(7,841)
Other assets/liabilities	(4,514)	(689)
Net cash provided by operating activities	277,512	283,235
INVESTING ACTIVITIES:
Purchase of investment securities	(130,627)	(168,923)
Proceeds from maturities of investment securities	258,076	199,294
Purchase of property and equipment, including capitalized interest	(234,469)	(187,456)
Other investing activities	10,201	(1,468)
Net cash used in investing activities	(96,819)	(158,553)
FINANCING ACTIVITIES:
Cash dividends paid to shareholders	(22,805)	(22,605)
Proceeds from the issuance of debt	770,435	10,797
Principal payments on debt and finance lease obligations	(522,616)	(142,399)
Payments of Debt Issuance Costs	(30,759)	(409)
Other financing activities	(2,689)	1,529
Net cash provided by (used in) financing activities	191,566	(153,087)
Net change in cash, cash equivalents, and restricted cash	372,259	(28,405)
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	95,911	70,639
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	468,170	42,234
CASH PAYMENTS (RECEIPTS) FOR:
Interest paid, net of amount capitalized	36,886	24,370
Income tax refunds	(3,340)	(41,284)
Operating Lease Obligations Incurred	23,320	0
Lease Obligation Incurred	$ 0	$ 102,609

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Parent [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Common Stock, Shares, Outstanding		16,066,000
Common Stock, Value, Issued		$ 23
Additional paid in capital			$ 253,840
Accumulated other comprehensive loss, net							$ (2,840)
Retained Earnings (Accumulated Deficit)						$ 907,943
Treasury Stock, Value					$ 605,655
Stockholders' Equity Attributable to Parent				$ 553,311
Stock Issued During Period, Shares, Employee Stock Purchase Plans		10,000
StockIssuedDuringPeriodSharesStockOptionsSARsExercised		98,000
Stock Issued During Period, Shares, New Issues	0	5,000	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			$ 9,194	$ 9,194
Treasury Stock, Value, Acquired, Cost Method				(2,994)	(2,994)
Stock Issued During Period, Value, Employee Stock Purchase Plan				1,624	1,624
Treasury Stock, Shares, Acquired		(18,000)
Dividends, Cash				(22,605)		(22,605)
Other Comprehensive Income (Loss), Net of Tax	$ 367			929		562	367
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 105,209			105,209		105,209
Common Stock, Shares, Outstanding		16,151,000
Common Stock, Value, Issued		$ 23
Additional paid in capital			$ 259,225
Accumulated other comprehensive loss, net							(3,959)
Retained Earnings (Accumulated Deficit)						952,403
Treasury Stock, Value					607,888
Stockholders' Equity Attributable to Parent				$ 599,804
Stock Issued During Period, Shares, Employee Stock Purchase Plans		10,000
StockIssuedDuringPeriodSharesStockOptionsSARsExercised		0
Stock Issued During Period, Shares, New Issues	0	5,000	0	0
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			$ 3,809	$ 3,809
Treasury Stock, Value, Acquired, Cost Method				(761)	(761)
Stock Issued During Period, Value, Employee Stock Purchase Plan				1,624	1,624
Treasury Stock, Shares, Acquired		(5,000)
Dividends, Cash				(11,310)		(11,310)
Other Comprehensive Income (Loss), Net of Tax	$ 1,486			1,486			1,486
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	50,016			50,016		50,016
Common Stock, Shares, Outstanding		16,161,000
Common Stock, Value, Issued		$ 23
Additional paid in capital			263,034
Accumulated other comprehensive loss, net							(2,473)
Retained Earnings (Accumulated Deficit)						991,109
Treasury Stock, Value					607,025
Stockholders' Equity Attributable to Parent				644,668
Common Stock, Shares, Outstanding		16,183,000
Common Stock, Value, Issued	23	$ 23
Additional paid in capital	270,935		270,935
Accumulated other comprehensive loss, net	(661)						(661)
Retained Earnings (Accumulated Deficit)	1,025,061					1,025,061
Treasury Stock, Value	(605,037)				605,037
Stockholders' Equity Attributable to Parent	690,321			690,321
Stock Issued During Period, Shares, Employee Stock Purchase Plans		20,000
StockIssuedDuringPeriodSharesStockOptionsSARsExercised		124,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			9,848	9,848
Treasury Stock, Value, Acquired, Cost Method				(3,009)	(3,009)
Stock Issued During Period, Value, Employee Stock Purchase Plan				2,931	2,931
Treasury Stock, Shares, Acquired		(22,000)
Dividends, Cash				(22,805)		(22,805)
Other Comprehensive Income (Loss), Net of Tax	657			106		(551)	657
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	127,667			127,667		127,667
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income				(550)		(550)
Common Stock, Shares, Outstanding		16,284,000
Common Stock, Value, Issued		$ 23
Additional paid in capital			276,247
Accumulated other comprehensive loss, net							(190)
Retained Earnings (Accumulated Deficit)						1,069,690
Treasury Stock, Value					607,316
Stockholders' Equity Attributable to Parent				738,454
Stock Issued During Period, Shares, Employee Stock Purchase Plans		20,000
StockIssuedDuringPeriodSharesStockOptionsSARsExercised		6,000
APIC, Share-based Payment Arrangement, Increase for Cost Recognition			4,536	4,536
Treasury Stock, Value, Acquired, Cost Method				(730)	(730)
Stock Issued During Period, Value, Employee Stock Purchase Plan				2,931	2,931
Treasury Stock, Shares, Acquired		(5,000)
Dividends, Cash				(11,411)		(11,411)
Other Comprehensive Income (Loss), Net of Tax	186			186			186
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	70,543			70,543		70,543
Common Stock, Shares, Outstanding		16,305,000
Common Stock, Value, Issued	23	$ 23
Additional paid in capital	280,783		$ 280,783
Accumulated other comprehensive loss, net	(4)						$ (4)
Retained Earnings (Accumulated Deficit)	1,128,822					$ 1,128,822
Treasury Stock, Value	(605,115)				$ 605,115
Stockholders' Equity Attributable to Parent	$ 804,509			$ 804,509

Consolidated Statements of St_2

Consolidated Statements of Stockholders' Equity Parentheticals - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Stockholders' Equity [Abstract]
Common Stock, Dividends, Per Share, Declared	$ 0.70	$ 0.70	$ 1.40	$ 1.40

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation The accompanying unaudited consolidated financial statements include the accounts of Allegiant Travel Company (the “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. These unaudited consolidated financial statements reflect all normal recurring adjustments which management believes are necessary to present fairly the financial position, results of operations, and cash flows of the Company for the respective periods presented. Certain reclassifications have been made to prior year financial statements to conform to classifications used in the current year. Certain information and footnote disclosures normally included in the annual consolidated financial statements prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") have been omitted pursuant to the rules and regulations of the Securities and Exchange Commission for Form 10-Q. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements of the Company and notes thereto included in the annual report of the Company on Form 10-K for the year ended December 31, 2018 and filed with the Securities and Exchange Commission. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities, at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates. Recent Accounting Pronouncements Recently Adopted Standards In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-02, Leases (Topic 842), (the "New Lease Standard"). This standard requires leases, other than short-term, to be recognized on the balance sheet as a lease liability and a corresponding right-of-use asset. 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 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. This standard is 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 is 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 statement of income and liquidity were not significantly impacted. The most significant change to the consolidated balance sheet upon adoption on January 1, 2019 relates 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 5, "Leases," for more information.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Jun. 30, 2019
Revenue Recognition [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue Recognition Passenger Revenue Passenger revenue is the most significant category in our reported operating revenues. Passenger revenue is primarily composed of scheduled service revenue (including passenger ticket sales and credit voucher breakage), revenue from ancillary air-related charges (including seat fees, baggage fees, and other travel-related services performed in conjunction with a passenger’s flight), as well as co-brand credit card point redemptions, as outlined below: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Scheduled service $ 237,685 $ 235,746 $ 472,456 $ 474,267 Ancillary air-related charges 213,527 167,630 395,227 322,347 Co-brand redemptions 3,567 2,196 7,072 5,729 Total passenger revenue $ 454,779 $ 405,572 $ 874,755 $ 802,343 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. The contract term of passenger tickets is twelve months and revenue associated with future travel will principally be recognized within this time frame. During the six months ended June 30, 2019 , $204.8 million was recognized into passenger revenue that was recorded in the air traffic liability balance of $212.2 million at December 31, 2018 . Co-brand redemptions In relation to the travel component of the 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: Six Months Ended June 30, (in thousands) 2019 2018 Balance at January 1 $ 10,708 $ 8,903 Points awarded (deferral of revenue) 8,827 6,898 Points redeemed (recognition of revenue) (7,072 ) (5,730 ) Balance at June 30 $ 12,463 $ 10,071 As of June 30, 2019 and 2018, $9.8 million and $6.9 million

Property and Equipment

Property and Equipment	6 Months Ended
	Jun. 30, 2019
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure	Property and Equipment Property and equipment: (in thousands) As of June 30, 2019 As of December 31, 2018 Flight equipment, including pre-delivery deposits $ 2,089,440 $ 1,905,157 Computer hardware and software 149,354 140,385 Land and buildings/leasehold improvements 85,939 85,925 Other property and equipment 121,285 89,778 Total property and equipment 2,446,018 2,221,245 Less accumulated depreciation and amortization (426,244 ) (373,977 ) Property and equipment, net $ 2,019,774 $ 1,847,268

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt and finance lease obligations: (in thousands) As of June 30, 2019 As of December 31, 2018 Fixed-rate debt and finance lease obligations due through 2029 (1) (2) $ 321,646 $ 640,806 Variable-rate debt due through 2029 1,177,611 630,927 Total long-term debt and finance lease obligations, net of related costs 1,499,257 1,271,733 Less current maturities, net of related costs (1) 160,523 152,287 Long-term debt and finance lease obligations, net of current maturities and related costs $ 1,338,734 $ 1,119,446 Weighted average fixed-interest rate on debt 4.7 % 5.3 % Weighted average variable-interest rate on debt 5.1 % 4.2 % (1) As of June 30, 2019, and December 31, 2018, respectively, $80.1 million and $428.0 million of the Company's Unsecured Senior Notes were classified as long-term as management refinanced the borrowings on a long-term basis in February 2019, as discussed below. (2) Includes finance lease obligations secured by five aircraft. Maturities of long-term debt and finance lease obligations for the remainder of 2019 and for the next four years and thereafter, in the aggregate, are: remaining in 2019 - $168.1 million ; 2020 - $138.9 million ; 2021 - $133.4 million ; 2022 - $113.9 million ; 2023 - $100.9 million ; and $844.1 million thereafter. Consolidated Variable Interest Entity 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. These borrowings bear interest at a blended rate of 3.8 percent , 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 $39.1 million and $44.0 million , respectively, at the time of borrowing. Senior Secured Revolving Credit Facility The Company has a senior secured revolving credit facility under which it is able to borrow up to $81.0 million . There was no balance under this facility as of June 30, 2019 . The facility has a term of 24 months and is based on the value of aircraft placed in the collateral pool. Aircraft remain in the collateral pool for up to two years, and, as of June 30, 2019 , there were four aircraft in the collateral pool. Secured Debt In June 2019, the Company entered into an agreement to borrow $213.0 million secured by 23 aircraft. The borrowing bears interest at a floating rate based on LIBOR, and is payable in quarterly installments over five years . A portion of the proceeds was used for the prepayment of six existing debt agreements and the repayment of the outstanding balance on the senior secured revolving credit facility. During the second quarter 2019, the Company borrowed a total of $63.4 million under multiple loan agreements secured by spare engines. The borrowings bear interest at a floating rate based on LIBOR, and are payable in quarterly installments, with terms ranging from seven to ten years . Term Loan 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"). 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 has a five-year term, bears interest based on LIBOR and provides for quarterly interest payments along with quarterly principal payments of $1.1 million through February 2024, at which time the Term Loan is due. The Term Loan may be prepaid at any time without penalty. In connection with the Term Loan, the Company conducted a tender offer for its 5.5 percent senior unsecured obligation, as outlined below. General Unsecured Senior Notes Since December 2016 and until February 2019, the Company had outstanding $450.0 million aggregate principal amount of senior unsecured obligations (the "Notes") which bore interest at 5.5 percent per year and matured in July 2019. In connection with the Term Loan discussed above, the Company completed a tender offer in February 2019, whereby it purchased $347.9 million of the Notes, and incurred related debt extinguishment costs of $3.7 million . The indenture governing the Notes was amended to eliminate most of the restrictive covenants and certain events of default and amend certain other provisions applicable to the Notes. The $428.0 million net proceeds from the Term Loan were used to purchase the Notes, of which the remaining $102.1 million outstanding at June 30, 2019 was paid at 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 may borrow up to $175.0 million (the “Loan”) to fund the construction of Phase 1 of Sunseeker Resort -Charlotte Harbor (the “Project”). No amount has been drawn under this agreement as of June 30, 2019 . Under the Construction Loan Agreement, the Lender is to provide the final $175.0 million

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value, Measurement Inputs, Disclosure	Fair Value Measurements 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 by selling 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. These tiers include: 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; and 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, US Treasury Bonds, and corporate debt securities, 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 June 30, 2019 As of December 31, 2018 (in thousands) Total Level 1 Level 2 Total Level 1 Level 2 Cash equivalents Money market funds $ 310,550 $ 310,550 $ — $ 43,281 $ 43,281 $ — Commercial paper 110,429 — 110,429 29,138 — 29,138 Municipal debt securities 2,408 — 2,408 — — — Federal agency debt securities 950 — 950 — — — US Treasury bonds — — — 1,415 — 1,415 Total cash equivalents 424,337 310,550 113,787 73,834 43,281 30,553 Short-term Commercial paper 138,332 — 138,332 180,846 — 180,846 Corporate debt securities 55,729 — 55,729 101,489 — 101,489 Federal agency debt securities 10,504 — 10,504 11,887 — 11,887 Municipal debt securities 7,450 — 7,450 14,252 — 14,252 US Treasury bonds 4,731 — 4,731 5,990 — 5,990 Total short-term 216,746 — 216,746 314,464 — 314,464 Long-term Corporate debt securities 20,367 — 20,367 37,334 — 37,334 US Treasury bonds 3,068 — 3,068 2,901 — 2,901 Federal agency debt securities 1,269 — 1,269 11,291 — 11,291 Total long-term 24,704 — 24,704 51,526 — 51,526 Total financial instruments $ 665,787 $ 310,550 $ 355,237 $ 439,824 $ 43,281 $ 396,543 The fair value of the Company’s publicly held long-term debt is determined based on inputs that are readily available in public markets or can be derived from information available in publicly quoted markets; therefore, the Company has categorized its publicly held debt as Level 2. The Company's remaining debt is not publicly held, and the Company has determined the estimated fair value of these notes to be Level 3, as certain inputs used to determine the fair value 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 are as follows: As of June 30, 2019 As of December 31, 2018 (in thousands) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Hierarchy Level Publicly held debt $ 102,090 $ 102,154 $ 450,463 $ 451,026 2 Non-publicly held debt 1,303,593 1,098,068 703,372 619,379 3 Total long-term debt $ 1,405,683 $ 1,200,222 $ 1,153,835 $ 1,070,405 Due to the short-term nature, carrying amounts of cash, cash equivalents, restricted cash, accounts receivable and accounts payable approximate fair value.

Earnings per Share

Earnings per Share	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share Basic and diluted earnings per share are computed pursuant to the two-class method. Under this method, the Company attributes net income to two classes: common stock and unvested restricted stock. Unvested restricted stock awards granted to employees under the Company’s Long-Term Incentive Plan are considered participating securities as 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 the 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: 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 three and six months ended June 30, 2019 and 2018 , respectively, the second method, which assumes unvested awards are not vested, was used in the computation because it was more dilutive than the first method. The following table sets forth the computation of net income per share, on a basic and diluted basis, for the periods indicated (share count and dollar amounts other than per-share amounts in table are in thousands): Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Basic: Net income $ 70,543 $ 50,016 $ 127,667 $ 105,209 Less net income allocated to participating securities (997 ) (659 ) (1,791 ) (1,427 ) Net income attributable to common stock $ 69,546 $ 49,357 $ 125,876 $ 103,782 Earnings per share, basic $ 4.33 $ 3.10 $ 7.85 $ 6.53 Weighted-average shares outstanding 16,063 15,939 16,037 15,898 Diluted: Net income $ 70,543 $ 50,016 $ 127,667 $ 105,209 Less net income allocated to participating securities (996 ) (658 ) (1,790 ) (1,425 ) Net income attributable to common stock $ 69,547 $ 49,358 $ 125,877 $ 103,784 Earnings per share, diluted $ 4.33 $ 3.10 $ 7.84 $ 6.52 Weighted-average shares outstanding 16,063 15,939 16,037 15,898 Dilutive effect of stock options and restricted stock 39 44 39 63 Adjusted weighted-average shares outstanding under treasury stock method 16,102 15,983 16,076 15,961 Participating securities excluded under two-class method (33 ) (38 ) (26 ) (47 ) Adjusted weighted-average shares outstanding under two-class method 16,069 15,945 16,050 15,914

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies As of June 30, 2019 , the Company had firm commitments to purchase nine Airbus A320 series aircraft and one CFM engine. The Company's contractual purchase commitments consist primarily of aircraft and engine acquisitions. The total future commitments are as follows: (in thousands) As of June 30, 2019 Remaining in 2019 $ 120,927 2020 33,800 2021 500 2022 18,000 Total commitments $ 173,227 Contingencies The Company is subject to certain 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.

Lease (Notes)

Lease (Notes)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Lessee, Leases [Policy Text Block]	Leases The Company determines if an arrangement is a lease at inception and has lease agreements for office facilities, office equipment, certain airport and terminal facilities, and other space and assets. These commitments have remaining non-cancelable lease terms, with lease expirations which range from 2019 to 2036. As a result of the New Lease Standard, certain real estate and property leases, and various other operating leases have been measured on the balance sheet with a lease liability and right-of-use asset ("ROU"). Airport terminal leases mostly include variable lease payments outside of those based on a fixed index, and are therefore excluded from consideration. Accounting for finance leases is substantially unchanged. 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 terms include options to extend when it is reasonably certain that the option will be exercised. Leases with a term of twelve 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. In addition to operating leases, the Company leases certain aircraft and, as of June 30, 2019 , had five aircraft under finance leases with remaining terms to 2029. Lease Costs The components of lease expense were as follows: Three Months Ended Six Months Ended (in thousands) Classification on the Statements of Income June 30, 2019 June 30, 2019 Finance lease costs: Amortization of assets Depreciation and amortization $ 1,629 $ 3,259 Interest on lease liabilities Interest expense 1,326 2,672 Operating lease cost Station operations; Maintenance and repairs; Other operating expense 805 1,581 Variable lease cost Station operations; Maintenance and repairs; Other operating expense 2,703 5,797 Total lease cost $ 6,463 $ 13,309 Lease position as of June 30, 2019 The table below presents the lease-related assets and liabilities recorded on the balance sheet. As of (in thousands) Classification on the Balance Sheet June 30, 2019 Assets Operating lease assets Operating lease right-of-use assets, net $ 22,233 Finance lease assets Property and equipment, net 114,924 Total lease assets $ 137,157 Liabilities Current Operating Accrued liabilities $ 2,240 Finance Current maturities of long-term debt and finance lease obligations 7,499 Noncurrent Operating Other noncurrent liabilities 21,476 Finance Long-term debt and finance lease obligations 111,805 Total lease liabilities $ 143,020 Weighted-average remaining lease term Operating leases 9.3 years Finance leases 10.4 years Weighted-average discount rate Operating leases 4.2 % Finance leases 4.4 % Other Information The table below presents supplemental cash flow information related to leases during the three and six months ended June 30, 2019 . Three Months Ended Six Months Ended (in thousands) June 30, 2019 June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 643 1,272 Operating cash flows for finance leases 1,326 2,672 Financing cash flows for finance leases 1,824 3,628 Maturities of Lease Liabilities The table below indicates the future minimum payments of lease liabilities as of June 30, 2019 . (in thousands) Operating Leases Finance Leases Remaining in 2019 $ 1,586 $ 6,300 2020 3,206 12,600 2021 3,249 12,600 2022 3,294 11,095 2023 3,147 10,500 Thereafter 14,325 103,459 Total lease payments 28,807 156,554 Less imputed interest (5,091 ) (37,250 ) Total lease obligations 23,716 119,304 Less current obligations (2,240 ) (7,499 ) Long-term lease obligations $ 21,476 $ 111,805 The Company adopted the New Lease Standard on January 1, 2019 as noted above, and as required, the following disclosure is provided for periods prior to adoption. Future annual minimum lease payments as of December 31, 2018 were as follows: (in thousands) Operating Leases Capital Leases 2019 $ 8,102 $ 12,600 2020 6,031 12,600 2021 3,643 12,600 2022 1,630 11,095 2023 1,626 10,500 Thereafter 8,297 103,458 Total lease payments $ 29,329 162,853 Less imputed interest (39,922 ) Total lease obligations 122,931 Less current obligations (7,336 ) Long-term lease obligations $ 115,595

Operating Segments (Notes)

Operating Segments (Notes)	6 Months Ended
	Jun. 30, 2019
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: the 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. Plans for the resort include a 500-room hotel and two towers offering an estimated 180 one, two and three bedroom suites, bar and restaurant options, and other amenities. The golf course is a short drive from the resort site and is considered, from a planning and strategic perspective, to be an additional resort amenity. The construction of Sunseeker Resort is an extension of the Company's leisure travel focus and it is expected that many customers flying to Southwest Florida on Allegiant will elect to stay at this resort and enjoy its amenities. 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. 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 Three Months Ended June 30, 2019 Operating revenue: Passenger $ 454,779 $ — $ — $ 454,779 Third party products 18,208 — — 18,208 Fixed fee contract 12,487 — — 12,487 Other 1,299 373 4,613 6,285 Operating income (loss) 115,546 (1,695 ) (5,746 ) 108,105 Interest expense, net 15,924 478 — 16,402 Depreciation and amortization 36,890 326 1,278 38,494 Capital expenditures 98,128 11,296 2,494 111,918 Three Months Ended June 30, 2018 Operating revenue: Passenger $ 405,572 $ — $ — $ 405,572 Third party products 17,799 — — 17,799 Fixed fee contract 7,653 — — 7,653 Other 3,531 — 2,225 5,756 Operating income (loss) 76,054 (301 ) (1,531 ) 74,222 Interest expense, net 11,229 — — 11,229 Depreciation and amortization 29,405 10 418 29,833 Capital expenditures 106,360 9,204 2,725 118,289 (in thousands) Airline Sunseeker Resort Other non- airline Consolidated Six Months Ended June 30, 2019 Operating revenue: Passenger $ 874,755 $ — $ — $ 874,755 Third party products 35,350 — — 35,350 Fixed fee contract 23,061 — — 23,061 Other 1,930 1,275 7,010 10,215 Operating income (loss) 214,035 (2,917 ) (11,937 ) 199,181 Interest expense, net 29,145 636 — 29,781 Depreciation and amortization 72,119 482 2,075 74,676 Capital expenditures 207,048 16,571 10,850 234,469 Six Months Ended June 30, 2018 Operating revenue: Passenger $ 802,343 $ — $ — $ 802,343 Third party products 28,124 — — 28,124 Fixed fee contract 18,209 — — 18,209 Other 10,197 — 3,351 13,548 Operating income (loss) 158,004 (446 ) (3,368 ) 154,190 Interest expense, net 22,046 — — 22,046 Depreciation and amortization 57,172 17 794 57,983 Capital expenditures 165,934 17,344 4,178 187,456 Total assets were as follows as of the date indicated: (in thousands) June 30, 2019 December 31, 2018 Airline $ 2,859,309 $ 2,422,523 Sunseeker Resort 80,895 56,047 Other non-airline 41,996 20,098 Consolidated $ 2,982,200 $ 2,498,668

Summary of Significant Accoun_2

Summary of Significant Accounting Policies - (Policies)	6 Months Ended
	Jun. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements include the accounts of Allegiant Travel Company (the “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. These unaudited consolidated financial statements reflect all normal recurring adjustments which management believes are necessary to present fairly the financial position, results of operations, and cash flows of the Company for the respective periods presented. Certain reclassifications have been made to prior year financial statements to conform to classifications used in the current year. Certain information and footnote disclosures normally included in the annual consolidated financial statements prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") have been omitted pursuant to the rules and regulations of the Securities and Exchange Commission for Form 10-Q. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements of the Company and notes thereto included in the annual report of the Company on Form 10-K for the year ended December 31, 2018 and filed with the Securities and Exchange Commission. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities, at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from these estimates.
New Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Standards In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-02, Leases (Topic 842), (the "New Lease Standard"). This standard requires leases, other than short-term, to be recognized on the balance sheet as a lease liability and a corresponding right-of-use asset. 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 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. This standard is 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 is 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 statement of income and liquidity were not significantly impacted. The most significant change to the consolidated balance sheet upon adoption on January 1, 2019 relates 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 5, "Leases," for more information.

Revenue Recognition (Tables)

Revenue Recognition (Tables)	6 Months Ended
	Jun. 30, 2019
Revenue Recognition [Abstract]
Disaggregation of Revenue [Table Text Block]	Passenger revenue is primarily composed of scheduled service revenue (including passenger ticket sales and credit voucher breakage), revenue from ancillary air-related charges (including seat fees, baggage fees, and other travel-related services performed in conjunction with a passenger’s flight), as well as co-brand credit card point redemptions, as outlined below: Three Months Ended June 30, Six Months Ended June 30, (in thousands) 2019 2018 2019 2018 Scheduled service $ 237,685 $ 235,746 $ 472,456 $ 474,267 Ancillary air-related charges 213,527 167,630 395,227 322,347 Co-brand redemptions 3,567 2,196 7,072 5,729 Total passenger revenue $ 454,779 $ 405,572 $ 874,755 $ 802,343
Contract with Customer, Asset and Liability [Table Text Block]	The following table presents the activity of the co-brand point liability as of the dates indicated: Six Months Ended June 30, (in thousands) 2019 2018 Balance at January 1 $ 10,708 $ 8,903 Points awarded (deferral of revenue) 8,827 6,898 Points redeemed (recognition of revenue) (7,072 ) (5,730 ) Balance at June 30 $ 12,463 $ 10,071

Property and Equipment (Tables)

Property and Equipment (Tables)	6 Months Ended
	Jun. 30, 2019
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	Property and equipment: (in thousands) As of June 30, 2019 As of December 31, 2018 Flight equipment, including pre-delivery deposits $ 2,089,440 $ 1,905,157 Computer hardware and software 149,354 140,385 Land and buildings/leasehold improvements 85,939 85,925 Other property and equipment 121,285 89,778 Total property and equipment 2,446,018 2,221,245 Less accumulated depreciation and amortization (426,244 ) (373,977 ) Property and equipment, net $ 2,019,774 $ 1,847,268

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt and finance lease obligations: (in thousands) As of June 30, 2019 As of December 31, 2018 Fixed-rate debt and finance lease obligations due through 2029 (1) (2) $ 321,646 $ 640,806 Variable-rate debt due through 2029 1,177,611 630,927 Total long-term debt and finance lease obligations, net of related costs 1,499,257 1,271,733 Less current maturities, net of related costs (1) 160,523 152,287 Long-term debt and finance lease obligations, net of current maturities and related costs $ 1,338,734 $ 1,119,446 Weighted average fixed-interest rate on debt 4.7 % 5.3 % Weighted average variable-interest rate on debt 5.1 % 4.2 %

Long-Term Debt Schedule of Matu

Long-Term Debt Schedule of Maturities (Tables)	6 Months Ended
	Jun. 30, 2019
Schedule of Maturities of Long-Term Debt [Abstract]
Schedule of Maturities of Long-term Debt	Maturities of long-term debt and finance lease obligations for the remainder of 2019 and for the next four years and thereafter, in the aggregate, are: remaining in 2019 - $168.1 million ; 2020 - $138.9 million ; 2021 - $133.4 million ; 2022 - $113.9 million ; 2023 - $100.9 million ; and $844.1 million thereafter.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2019
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 June 30, 2019 As of December 31, 2018 (in thousands) Total Level 1 Level 2 Total Level 1 Level 2 Cash equivalents Money market funds $ 310,550 $ 310,550 $ — $ 43,281 $ 43,281 $ — Commercial paper 110,429 — 110,429 29,138 — 29,138 Municipal debt securities 2,408 — 2,408 — — — Federal agency debt securities 950 — 950 — — — US Treasury bonds — — — 1,415 — 1,415 Total cash equivalents 424,337 310,550 113,787 73,834 43,281 30,553 Short-term Commercial paper 138,332 — 138,332 180,846 — 180,846 Corporate debt securities 55,729 — 55,729 101,489 — 101,489 Federal agency debt securities 10,504 — 10,504 11,887 — 11,887 Municipal debt securities 7,450 — 7,450 14,252 — 14,252 US Treasury bonds 4,731 — 4,731 5,990 — 5,990 Total short-term 216,746 — 216,746 314,464 — 314,464 Long-term Corporate debt securities 20,367 — 20,367 37,334 — 37,334 US Treasury bonds 3,068 — 3,068 2,901 — 2,901 Federal agency debt securities 1,269 — 1,269 11,291 — 11,291 Total long-term 24,704 — 24,704 51,526 — 51,526 Total financial instruments $ 665,787 $ 310,550 $ 355,237 $ 439,824 $ 43,281 $ 396,543
Fair Value, Liabilities Measured on Recurring Basis	Carrying value and estimated fair value of long-term debt, including current maturities and without reduction for related costs are as follows: As of June 30, 2019 As of December 31, 2018 (in thousands) Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Hierarchy Level Publicly held debt $ 102,090 $ 102,154 $ 450,463 $ 451,026 2 Non-publicly held debt 1,303,593 1,098,068 703,372 619,379 3 Total long-term debt $ 1,405,683 $ 1,200,222 $ 1,153,835 $ 1,070,405

Earnings per Share (Tables)

Earnings per Share (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Computation of Net Income Per Share, Basic and Diluted	The following table sets forth the computation of net income per share, on a basic and diluted basis, for the periods indicated (share count and dollar amounts other than per-share amounts in table are in thousands): Three Months Ended June 30, Six Months Ended June 30, 2019 2018 2019 2018 Basic: Net income $ 70,543 $ 50,016 $ 127,667 $ 105,209 Less net income allocated to participating securities (997 ) (659 ) (1,791 ) (1,427 ) Net income attributable to common stock $ 69,546 $ 49,357 $ 125,876 $ 103,782 Earnings per share, basic $ 4.33 $ 3.10 $ 7.85 $ 6.53 Weighted-average shares outstanding 16,063 15,939 16,037 15,898 Diluted: Net income $ 70,543 $ 50,016 $ 127,667 $ 105,209 Less net income allocated to participating securities (996 ) (658 ) (1,790 ) (1,425 ) Net income attributable to common stock $ 69,547 $ 49,358 $ 125,877 $ 103,784 Earnings per share, diluted $ 4.33 $ 3.10 $ 7.84 $ 6.52 Weighted-average shares outstanding 16,063 15,939 16,037 15,898 Dilutive effect of stock options and restricted stock 39 44 39 63 Adjusted weighted-average shares outstanding under treasury stock method 16,102 15,983 16,076 15,961 Participating securities excluded under two-class method (33 ) (38 ) (26 ) (47 ) Adjusted weighted-average shares outstanding under two-class method 16,069 15,945 16,050 15,914

Commitments and Contingencies P

Commitments and Contingencies Payments Related to Commitments to Purchase (Tables)	6 Months Ended
	Jun. 30, 2019
Payments Related to Commitments to Purchase [Abstract]
Long-term Purchase Commitment [Table Text Block]	The Company's contractual purchase commitments consist primarily of aircraft and engine acquisitions. The total future commitments are as follows: (in thousands) As of June 30, 2019 Remaining in 2019 $ 120,927 2020 33,800 2021 500 2022 18,000 Total commitments $ 173,227

Lease (Tables)

Lease (Tables)	6 Months Ended
	Jun. 30, 2019
Cash paid for lease [Abstract]
Lease, Cost [Table Text Block]	The components of lease expense were as follows: Three Months Ended Six Months Ended (in thousands) Classification on the Statements of Income June 30, 2019 June 30, 2019 Finance lease costs: Amortization of assets Depreciation and amortization $ 1,629 $ 3,259 Interest on lease liabilities Interest expense 1,326 2,672 Operating lease cost Station operations; Maintenance and repairs; Other operating expense 805 1,581 Variable lease cost Station operations; Maintenance and repairs; Other operating expense 2,703 5,797 Total lease cost $ 6,463 $ 13,309
Leases of Lessee Disclosure [Text Block]	The table below presents the lease-related assets and liabilities recorded on the balance sheet. As of (in thousands) Classification on the Balance Sheet June 30, 2019 Assets Operating lease assets Operating lease right-of-use assets, net $ 22,233 Finance lease assets Property and equipment, net 114,924 Total lease assets $ 137,157 Liabilities Current Operating Accrued liabilities $ 2,240 Finance Current maturities of long-term debt and finance lease obligations 7,499 Noncurrent Operating Other noncurrent liabilities 21,476 Finance Long-term debt and finance lease obligations 111,805 Total lease liabilities $ 143,020 Weighted-average remaining lease term Operating leases 9.3 years Finance leases 10.4 years Weighted-average discount rate Operating leases 4.2 % Finance leases 4.4 %
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The table below presents supplemental cash flow information related to leases during the three and six months ended June 30, 2019 . Three Months Ended Six Months Ended (in thousands) June 30, 2019 June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows for operating leases $ 643 1,272 Operating cash flows for finance leases 1,326 2,672 Financing cash flows for finance leases 1,824 3,628
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 June 30, 2019 . (in thousands) Operating Leases Finance Leases Remaining in 2019 $ 1,586 $ 6,300 2020 3,206 12,600 2021 3,249 12,600 2022 3,294 11,095 2023 3,147 10,500 Thereafter 14,325 103,459 Total lease payments 28,807 156,554 Less imputed interest (5,091 ) (37,250 ) Total lease obligations 23,716 119,304 Less current obligations (2,240 ) (7,499 ) Long-term lease obligations $ 21,476 $ 111,805 The Company adopted the New Lease Standard on January 1, 2019 as noted above, and as required, the following disclosure is provided for periods prior to adoption. Future annual minimum lease payments as of December 31, 2018 were as follows: (in thousands) Operating Leases Capital Leases 2019 $ 8,102 $ 12,600 2020 6,031 12,600 2021 3,643 12,600 2022 1,630 11,095 2023 1,626 10,500 Thereafter 8,297 103,458 Total lease payments $ 29,329 162,853 Less imputed interest (39,922 ) Total lease obligations 122,931 Less current obligations (7,336 ) Long-term lease obligations $ 115,595

Operating Segments (Tables)

Operating Segments (Tables)	6 Months Ended
	Jun. 30, 2019
Segment Reporting [Abstract]
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 Three Months Ended June 30, 2019 Operating revenue: Passenger $ 454,779 $ — $ — $ 454,779 Third party products 18,208 — — 18,208 Fixed fee contract 12,487 — — 12,487 Other 1,299 373 4,613 6,285 Operating income (loss) 115,546 (1,695 ) (5,746 ) 108,105 Interest expense, net 15,924 478 — 16,402 Depreciation and amortization 36,890 326 1,278 38,494 Capital expenditures 98,128 11,296 2,494 111,918 Three Months Ended June 30, 2018 Operating revenue: Passenger $ 405,572 $ — $ — $ 405,572 Third party products 17,799 — — 17,799 Fixed fee contract 7,653 — — 7,653 Other 3,531 — 2,225 5,756 Operating income (loss) 76,054 (301 ) (1,531 ) 74,222 Interest expense, net 11,229 — — 11,229 Depreciation and amortization 29,405 10 418 29,833 Capital expenditures 106,360 9,204 2,725 118,289 (in thousands) Airline Sunseeker Resort Other non- airline Consolidated Six Months Ended June 30, 2019 Operating revenue: Passenger $ 874,755 $ — $ — $ 874,755 Third party products 35,350 — — 35,350 Fixed fee contract 23,061 — — 23,061 Other 1,930 1,275 7,010 10,215 Operating income (loss) 214,035 (2,917 ) (11,937 ) 199,181 Interest expense, net 29,145 636 — 29,781 Depreciation and amortization 72,119 482 2,075 74,676 Capital expenditures 207,048 16,571 10,850 234,469 Six Months Ended June 30, 2018 Operating revenue: Passenger $ 802,343 $ — $ — $ 802,343 Third party products 28,124 — — 28,124 Fixed fee contract 18,209 — — 18,209 Other 10,197 — 3,351 13,548 Operating income (loss) 158,004 (446 ) (3,368 ) 154,190 Interest expense, net 22,046 — — 22,046 Depreciation and amortization 57,172 17 794 57,983 Capital expenditures 165,934 17,344 4,178 187,456 Total assets were as follows as of the date indicated: (in thousands) June 30, 2019 December 31, 2018 Airline $ 2,859,309 $ 2,422,523 Sunseeker Resort 80,895 56,047 Other non-airline 41,996 20,098 Consolidated $ 2,982,200 $ 2,498,668

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Policies (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Adjustments for New Accounting Pronouncements [Line Items]
Operating Lease, Right-of-Use Asset		$ 18,000
Operating Lease, Liability	$ 23,716	$ 19,100

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Passenger	$ 454,779	$ 405,572	$ 874,755	$ 802,343
Allegiant Air
Disaggregation of Revenue [Line Items]
Passenger	454,779	405,572	874,755	802,343
Allegiant Air | Scheduled Service Revenue
Disaggregation of Revenue [Line Items]
Passenger	237,685	235,746	472,456	474,267
Allegiant Air | Air-related revenue
Disaggregation of Revenue [Line Items]
Passenger	213,527	167,630	395,227	322,347
Allegiant Air | Co-brand Revenue
Disaggregation of Revenue [Line Items]
Passenger	$ 3,567	$ 2,196	$ 7,072	$ 5,729

Revenue Recognition Points Liab

Revenue Recognition Points Liability (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Points Liability [Abstract]
Points Liability Start of Period	$ 10,708	$ 8,903
Points awarded	8,827	6,898
Points redeemed	(7,072)	(5,730)
Contract with Customer, Liability	12,463	10,071
Points Liability	$ 9,800	$ 6,900

Revenue Recognition Passenger R

Revenue Recognition Passenger Revenue (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Revenue Recognition [Abstract]
Increase (Decrease) in Deferred Air Traffic Revenue	$ 204,800
Air traffic liability	$ 267,050	$ 212,230

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Flight equipment, including pre-delivery deposits	$ 2,089,440	$ 1,905,157
Computer hardware and software	149,354	140,385
Land and buildings/leasehold improvements	85,939	85,925
Other property and equipment	121,285	89,778
Total property and equipment	2,446,018	2,221,245
Less accumulated depreciation and amortization	426,244	373,977
Property and equipment, net	$ 2,019,774	$ 1,847,268

Long-Term Debt Components of Lo

Long-Term Debt Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Notes Payable	$ 1,405,683	$ 1,153,835
Secured Long-term Debt, Noncurrent	1,499,257	1,271,733
Less current maturities	160,523	152,287
Long-term debt and capital leases, net of current maturities and related costs	1,338,734	1,119,446
Weighted average fixed-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 321,646	$ 640,806
Long-term Debt, Weighted Average Interest Rate, at Point in Time	4.70%	5.30%
Weighted average variable-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 1,177,611	$ 630,927
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.10%	4.20%
Unsecured Debt | Weighted average fixed-interest rate on debt
Debt Instrument [Line Items]
Notes Payable	$ 80,100	$ 428,000

Long-Term Debt (Details)

Long-Term Debt (Details)	2 Months Ended	3 Months Ended				6 Months Ended
	Feb. 15, 2019USD ($)	Jun. 30, 2019USD ($)Aircraftaircraft	Mar. 31, 2019USD ($)aircraft	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Jun. 30, 2019USD ($)Aircraftaircraft	Jun. 30, 2018USD ($)	Feb. 01, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2016USD ($)
Capital Leased Assets, Number of Units | Aircraft		5				5
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year		$ 168,100,000				$ 168,100,000
Long-term Debt, Maturities, Repayments of Principal in Year Two		138,900,000				138,900,000
Long-term Debt, Maturities, Repayments of Principal in Year Three		133,400,000				133,400,000
Long-term Debt, Maturities, Repayments of Principal in Year Four		113,900,000				113,900,000
Long-term Debt, Maturities, Repayments of Principal in Year Five		100,900,000				100,900,000
Long-term Debt, Maturities, Repayments of Principal after Year Five		844,100,000				844,100,000
Debt Instrument, Face Amount		63,400,000				63,400,000		$ 450,000,000
Secured Long-term Debt, Noncurrent		1,499,257,000				1,499,257,000			$ 1,271,733,000
Line of Credit Facility, Maximum Borrowing Capacity			$ 175,000,000
Finance Lease, Right-of-Use Asset, Amortization		1,629,000				3,259,000
Line of Credit Facility, Fair Value of Amount Outstanding			0
Repayments of Unsecured Debt		102,100,000
Gain (Loss) on Extinguishment of Debt		$ 0	3,700,000	$ 0		$ 3,677,000	$ 0
Debt, Number of Debt Instruments		6				6
Debt Instrument, Periodic Payment, Principal	$ 1,100,000
Consolidated Variable Interest Entity
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities			44,000,000
Variable Interest Entity, Consolidated, Carrying Amount, Assets			$ 39,100,000
Debt, Weighted Average Interest Rate			3.80%
Senior Secured Revolving Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity					$ 81,000,000
Line of Credit Facility, Fair Value of Amount Outstanding		$ 0				$ 0
Debt Instrument, Term					24 months
Unsecured Debt
Unsecured Long-term Debt, Noncurrent										$ 450,000,000
Debt Instrument, Interest Rate, Stated Percentage										5.50%
Repayments of Unsecured Debt	$ 347,900,000
Airbus A320 Aircraft Series | Consolidated Variable Interest Entity
Number Of Aircrafts Included As Collateral | aircraft			1
Loan Due June 2024
Debt Instrument, Face Amount		$ 213,000,000				$ 213,000,000
Number Of Aircrafts Included As Collateral | aircraft		23
Debt Instrument, Term		5 years
Minimum
Debt Instrument, Term		7 years
Maximum
Debt Instrument, Term		10 years
Senior Secured Revolving Credit Facility
Number Of Aircrafts Included As Collateral | aircraft						4
Term Loan Due February 2024
Debt Instrument, Term			5 years
Net Proceeds
Debt Instrument, Face Amount								$ 428,000,000

Long-Term Debt Schedule of Ma_2

Long-Term Debt Schedule of Maturities of Long-Term Debt (Details)	3 Months Ended			6 Months Ended
	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)aircraft	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt	$ 0	$ (3,700,000)	$ 0	$ (3,677,000)	$ 0
Line of Credit Facility, Maximum Borrowing Capacity		175,000,000
Line of Credit Facility, Fair Value of Amount Outstanding		$ 0
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	168,100,000			168,100,000
Long-term Debt, Maturities, Repayments of Principal in Year Two	138,900,000			138,900,000
Long-term Debt, Maturities, Repayments of Principal in Year Three	133,400,000			133,400,000
Long-term Debt, Maturities, Repayments of Principal in Year Four	113,900,000			113,900,000
Long-term Debt, Maturities, Repayments of Principal in Year Five	100,900,000			100,900,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	844,100,000			844,100,000
Long-term Debt, Fair Value	$ 1,499,257,000			$ 1,499,257,000		$ 1,271,733,000
Term Loan Due February 2024
Debt Instrument [Line Items]
Debt Instrument, Term		5 years
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Number Of Aircrafts Included As Collateral | aircraft				4

Fair Value Measurements (Detail

Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Available-for-sale Securities	$ 665,787	$ 439,824
Fair Value, Inputs, Level 1
Available-for-sale Securities	310,550	43,281
Fair Value, Inputs, Level 2
Available-for-sale Securities	355,237	396,543
Short-term Investments
Available-for-sale Securities	216,746	314,464
Short-term Investments | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Fair Value, Inputs, Level 2
Available-for-sale Securities	216,746	314,464
Short-term Investments | Commercial paper
Available-for-sale Securities	138,332	180,846
Short-term Investments | Commercial paper | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Commercial paper | Fair Value, Inputs, Level 2
Available-for-sale Securities	138,332	180,846
Short-term Investments | Federal agency debt securities
Available-for-sale Securities	10,504	11,887
Short-term Investments | Federal agency debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Federal agency debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	10,504	11,887
Short-term Investments | Municipal debt securities
Available-for-sale Securities	7,450	14,252
Short-term Investments | Municipal debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Municipal debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	7,450	14,252
Short-term Investments | Corporate debt securities
Available-for-sale Securities	55,729	101,489
Short-term Investments | Corporate debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Corporate debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	55,729	101,489
Short-term Investments | US Treasury Bond Securities
Available-for-sale Securities	4,731	5,990
Short-term Investments | US Treasury Bond Securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | US Treasury Bond Securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	4,731	5,990
Long Term Investments
Available-for-sale Securities	24,704	51,526
Long Term Investments | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | Fair Value, Inputs, Level 2
Available-for-sale Securities	24,704	51,526
Long Term Investments | Federal agency debt securities
Available-for-sale Securities	1,269	11,291
Long Term Investments | Federal agency debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | Federal agency debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	1,269	11,291
Long Term Investments | Corporate debt securities
Available-for-sale Securities	20,367	37,334
Long Term Investments | Corporate debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | Corporate debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	20,367	37,334
Long Term Investments | US Treasury Bond Securities
Available-for-sale Securities	3,068	2,901
Long Term Investments | US Treasury Bond Securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | US Treasury Bond Securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	3,068	2,901
Cash Equivalents
Cash Equivalents	424,337	73,834
Cash Equivalents | Fair Value, Inputs, Level 1
Cash Equivalents	310,550	43,281
Cash Equivalents | Fair Value, Inputs, Level 2
Cash Equivalents	113,787	30,553
Cash Equivalents | Money Market Funds
Cash Equivalents	310,550	43,281
Cash Equivalents | Money Market Funds | Fair Value, Inputs, Level 1
Cash Equivalents	310,550	43,281
Cash Equivalents | Money Market Funds | Fair Value, Inputs, Level 2
Cash Equivalents	0	0
Cash Equivalents | Commercial paper
Cash Equivalents	110,429	29,138
Cash Equivalents | Commercial paper | Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents | Commercial paper | Fair Value, Inputs, Level 2
Cash Equivalents	110,429	29,138
Cash Equivalents | Federal agency debt securities
Cash Equivalents	950	0
Cash Equivalents | Federal agency debt securities | Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents | Federal agency debt securities | Fair Value, Inputs, Level 2
Cash Equivalents	950	0
Cash Equivalents | Municipal debt securities
Cash Equivalents	2,408	0
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	2,408	0
Cash Equivalents | US Treasury Bond Securities
Cash Equivalents	0	1,415
Cash Equivalents | US Treasury Bond Securities | Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents | US Treasury Bond Securities | Fair Value, Inputs, Level 2
Cash Equivalents	$ 0	$ 1,415

Fair Value Measurements Estimat

Fair Value Measurements Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	$ 1,499,257	$ 1,271,733
Notes Payable	1,405,683	1,153,835
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	1,200,222	1,070,405
Publicly Held Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	102,090	450,463
Publicly Held Debt | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	102,154	451,026
Non-Publicly Held Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	1,303,593	703,372
Non-Publicly Held Debt | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	$ 1,098,068	$ 619,379

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic:
Net income attributable to Allegiant Travel Company (in Dollars)	$ 70,543	$ 50,016	$ 127,667	$ 105,209
Less: Net income allocated to participating securities (in Dollars)	(997)	(659)	(1,791)	(1,427)
Net income attributable to common stock (in Dollars)	$ 69,546	$ 49,357	$ 125,876	$ 103,782
Net income per share, basic (in Dollars per share)	$ 4.33	$ 3.10	$ 7.85	$ 6.53
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted	$ (996)	$ (658)	$ (1,790)	$ (1,425)
Net Income (Loss) Available to Common Stockholders, Diluted	$ 69,547	$ 49,358	$ 125,877	$ 103,784
Diluted earnings per share	$ 4.33	$ 3.10	$ 7.84	$ 6.52
Weighted-average shares outstanding	16,063,000	15,939,000	16,037,000	15,898,000
Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights	39,000	44,000	39,000	63,000
Adjusted weighted-average shares outstanding under treasury stock method	16,102,000	15,983,000	16,076,000	15,961,000
Participating securities excluded under two-class method	(33,000)	(38,000)	(26,000)	(47,000)
Two-Class Method, Weighted Average Number of Shares Outstanding, Diluted	16,069,000	15,945,000	16,050,000	15,914,000

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2019USD ($)aircraftAircraft
Long-term Purchase Commitment [Line Items]
Number Of Aircraft Committed To Purchase | aircraft	9
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	$ 120,927
Unrecorded Unconditional Purchase Obligation, Due within Two Years	33,800
Unrecorded Unconditional Purchase Obligation, Due within Three Years	500
Unrecorded Unconditional Purchase Obligation, Due within Four Years	18,000
Unrecorded Unconditional Purchase Obligation	$ 173,227
Airbus A320 Aircraft Series
Long-term Purchase Commitment [Line Items]
Engine scheduled to be acquired | Aircraft	1

Commitments and Contingencies_2

Commitments and Contingencies Payments Related to Commitments to Purchase (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2019USD ($)Aircraft
Long-term Purchase Commitment [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	$ 120,927
Unrecorded Unconditional Purchase Obligation, Due within Two Years	33,800
Unrecorded Unconditional Purchase Obligation, Due within Three Years	500
Unrecorded Unconditional Purchase Obligation, Due within Four Years	18,000
Unrecorded Unconditional Purchase Obligation	$ 173,227
Airbus A320 Aircraft Series
Long-term Purchase Commitment [Line Items]
Engine scheduled to be acquired | Aircraft	1

Lease (Details)

Lease (Details) $ in Thousands	Jun. 30, 2019USD ($)Aircraft	Jan. 01, 2019USD ($)	Dec. 31, 2018USD ($)
Leases [Abstract]
Capital Leased Assets, Number of Units | Aircraft	5
Finance Lease, Weighted Average Remaining Lease Term	9 years 3 months 20 days
Operating Lease, Liability	$ 23,716	$ 19,100
Finance Lease, Right-of-Use Asset	114,924
Total Right-of-Use Asset	137,157
Operating Lease, Liability, Current	2,240
Finance Lease, Liability, Current	7,499
Operating Lease, Liability, Noncurrent	21,476
Finance Lease, Liability, Noncurrent	111,805
Total Lease Liability	$ 143,020
Operating Lease, Weighted Average Discount Rate, Percent	4.20%
Finance Lease, Weighted Average Discount Rate, Percent	4.40%
Operating lease right-of-use assets, net	$ 22,233		$ 0
Operating Lease, Weighted Average Remaining Lease Term	10 years 5 months 6 days

Lease Cash paid for lease (Deta

Lease Cash paid for lease (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Cash paid for lease [Abstract]
Operating Lease, Payments	$ 643	$ 1,272
Finance Lease, Interest Payment on Liability	1,326	2,672
Finance Lease, Principal Payments	$ 1,824	$ 3,628

Lease Scheduled Lease Payments

Lease Scheduled Lease Payments Commitments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Scheduled Lease Payment Commitments [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months			$ 8,102
Capital Leases, Future Minimum Payments Due, Next Twelve Months			12,600
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 1,586
Finance Lease, Liability, Payments, Remainder of Fiscal Year	6,300
Lessee, Operating Lease, Liability, Payments, Due Year Two	3,206
Finance Lease, Liability, Payments, Due Year Two	12,600
Lessee, Operating Lease, Liability, Payments, Due Year Three	3,249
Finance Lease, Liability, Payments, Due Year Three	12,600
Lessee, Operating Lease, Liability, Payments, Due Year Four	3,294
Finance Lease, Liability, Payments, Due Year Four	11,095
Lessee, Operating Lease, Liability, Payments, Due Year Five	3,147
Finance Lease, Liability, Payments, Due Year Five	10,500
Lessee, Operating Lease, Liability, Payments, Due after Year Five	14,325
Finance Lease, Liability, Payments, Due after Year Five	103,459
Lessee, Operating Lease, Liability, Payments, Due	28,807
Finance Lease, Liability, Payment, Due	156,554
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(5,091)
Finance Lease, Liability, Undiscounted Excess Amount	(37,250)
Operating Lease, Liability	23,716	$ 19,100
Finance Lease, Liability	119,304
Operating Lease, Liability, Current	(2,240)
Finance Lease, Liability, Current	(7,499)
Operating Lease, Liability, Noncurrent	21,476
Finance Lease, Liability, Noncurrent	$ 111,805
Operating Leases, Future Minimum Payments, Due in Two Years			6,031
Capital Leases, Future Minimum Payments Due in Two Years			12,600
Operating Leases, Future Minimum Payments, Due in Three Years			3,643
Capital Leases, Future Minimum Payments Due in Three Years			12,600
Operating Leases, Future Minimum Payments, Due in Four Years			1,630
Capital Leases, Future Minimum Payments Due in Four Years			11,095
Operating Leases, Future Minimum Payments, Due in Five Years			1,626
Capital Leases, Future Minimum Payments Due in Five Years			10,500
Operating Leases, Future Minimum Payments, Due Thereafter			8,297
Capital Leases, Future Minimum Payments, Due in Rolling after Year Five			103,458
Commitments, Fair Value Disclosure			29,329
Capital Leases, Future Minimum Payments Due			162,853
Capital Leases, Future Minimum Payments, Interest Included in Payments			(39,922)
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments			122,931
Capital Lease Obligations, Current			(7,336)
Capital Lease Obligations, Noncurrent			$ 115,595

Lease Lease Costs (Details)

Lease Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 1,629	$ 3,259
Finance Lease, Interest Payment on Liability	1,326	2,672
Operating Lease, Cost	805	1,581
Variable Lease, Cost	2,703	5,797
Lease, Cost	$ 6,463	$ 13,309

Operating Segments (Details)

Operating Segments (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments			3
Passenger	$ 454,779	$ 405,572	$ 874,755	$ 802,343
Third party products	18,208	17,799	35,350	28,124
Fixed fee contracts	12,487	7,653	23,061	18,209
Other	6,285	5,756	10,215	13,548
Operating Income (Loss)	108,105	74,222	199,181	154,190
Interest Revenue (Expense), Net	16,402	11,229	29,781	22,046
Depreciation and amortization	38,494	29,833	74,676	57,983
Assets	2,982,200		2,982,200		$ 2,498,668
Payments to Acquire Productive Assets	111,918	118,289	234,469	187,456
Allegiant Air
Segment Reporting Information [Line Items]
Passenger	454,779	405,572	874,755	802,343
Third party products	18,208	17,799	35,350	28,124
Fixed fee contracts	12,487	7,653	23,061	18,209
Other	1,299	3,531	1,930	10,197
Operating Income (Loss)	115,546	76,054	214,035	158,004
Interest Revenue (Expense), Net	15,924	11,229	29,145	22,046
Depreciation and amortization	36,890	29,405	72,119	57,172
Assets	2,859,309		2,859,309		2,422,523
Payments to Acquire Productive Assets	98,128	106,360	207,048	165,934
Sunseeker Resorts
Segment Reporting Information [Line Items]
Passenger		0
Other	373	0	1,275	0
Operating Income (Loss)	(1,695)	(301)	(2,917)	(446)
Interest Revenue (Expense), Net	478	0	636	0
Depreciation and amortization	326	10	482	17
Assets	80,895		80,895		56,047
Payments to Acquire Productive Assets	11,296	9,204	16,571	17,344
Other
Segment Reporting Information [Line Items]
Passenger		0
Other	4,613	2,225	7,010	3,351
Operating Income (Loss)	(5,746)	(1,531)	(11,937)	(3,368)
Interest Revenue (Expense), Net	0	0	0	0
Depreciation and amortization	1,278	418	2,075	794
Assets	41,996		41,996		$ 20,098
Payments to Acquire Productive Assets	$ 2,494	$ 2,725	$ 10,850	$ 4,178