Allegiant Travel (ALGT) 10-Q 31 Oct 18 2018 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 26, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	Allegiant Travel CO
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		16,159,816
Amendment Flag	false
Entity Central Index Key	1,362,468
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3

Consolidated Balance Sheets (Cu

Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.001
CURRENT ASSETS
Cash and cash equivalents	$ 140,752	$ 59,449
Restricted cash	20,317	11,190
Short-term investments	284,616	352,681
Accounts receivable	33,672	71,057
Expendable parts, supplies and fuel, net	23,790	17,647
Prepaid expenses	30,640	23,931
Other current assets	129	5,320
TOTAL CURRENT ASSETS	533,916	541,275
Property and equipment, net	1,816,805	1,512,415
Long-term investments	53,353	78,570
Deferred major maintenance, net	44,402	31,326
Deposits and other assets	32,019	16,571
TOTAL ASSETS:	2,480,495	2,180,157
CURRENT LIABILITIES
Accounts payable	17,299	20,108
Accrued liabilities	110,705	105,127
Air traffic liability	231,731	204,299
Current maturities of long-term debt and capital lease obligations, net of related costs	654,697	214,761
TOTAL CURRENT LIABILITIES	1,014,432	544,295
Long-term debt and capital lease obligations, net of current maturities and related costs	658,352	950,131
Deferred income taxes	140,555	119,013
Other noncurrent liabilities	14,160	13,407
TOTAL LIABILITIES:	1,827,499	1,626,846
SHAREHOLDERS' EQUITY
Common stock, par value $.001	23	23
Treasury stock	(607,649)	(605,655)
Additional paid in capital	266,907	253,840
Accumulated other comprehensive loss, net	(1,227)	(2,840)
Retained earnings	994,942	907,943
TOTAL EQUITY:	652,996	553,311
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY:	$ 2,480,495	$ 2,180,157

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Cash dividends declared per share:	$ 0.70	$ 0.70	$ 2.10	$ 2.10
OPERATING REVENUE:
Passenger revenue	$ 355,100	$ 315,308	$ 1,157,443	$ 1,030,395
Third party products	15,921	12,348	44,045	39,394
Fixed fee contract revenue	14,791	11,831	33,000	34,120
Other revenue	7,297	10,708	20,845	28,140
Total operating revenue	393,109	350,195	1,255,333	1,132,049
OPERATING EXPENSES:
Aircraft fuel	113,525	80,421	342,006	250,470
Salary and benefits	97,706	88,788	312,314	277,307
Station operations	43,128	37,148	122,265	107,979
Maintenance and repairs	31,983	28,870	75,864	87,611
Depreciation and amortization	34,658	31,894	92,641	92,571
Sales and marketing	16,798	13,884	54,224	40,707
Aircraft lease rentals	671	533	767	3,098
Other	28,459	24,315	74,881	68,440
Total operating expenses	366,928	305,853	1,074,962	928,183
OPERATING INCOME	26,181	44,342	180,371	203,866
OTHER (INCOME) EXPENSE:
Interest expense	14,309	10,041	40,188	27,332
Interest income	(2,425)	(1,454)	(6,259)	(4,193)
Other, net	(118)	(400)	(408)	(1,254)
Total other expense	11,766	8,187	33,521	21,885
INCOME BEFORE INCOME TAXES	14,415	36,155	146,850	181,981
PROVISION FOR INCOME TAXES	(732)	12,771	26,494	67,208
NET INCOME	$ 15,147	$ 23,384	$ 120,356	$ 114,773
Earnings per share to common shareholders:
Basic	$ 0.94	$ 1.45	$ 7.46	$ 7
Earnings Per Share, Diluted	$ 0.94	$ 1.45	$ 7.45	$ 6.99
Shares used for computation:
Basic	15,957,000	15,852,000	15,929,000	16,142,000
Diluted	15,962,000	15,862,000	15,938,000	16,160,000

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 15,147	$ 23,384	$ 120,356	$ 114,773
Other comprehensive income (loss):
Change in available for sale securities, net of tax	(83)	230	(926)	453
Foreign currency translation adjustments	4	(117)	218	(416)
Change in derivatives, net of tax	1,325	(368)	2,321	(1,452)
Total other comprehensive income (loss)	1,246	(255)	1,613	(1,415)
TOTAL COMPREHENSIVE INCOME	$ 16,393	$ 23,129	$ 121,969	$ 113,358

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Adjustments to reconcile net income to net cash provided by operating activities:
Net income	$ 120,356	$ 114,773
Depreciation and amortization	92,641	92,571
(Gain) loss on aircraft and other equipment disposals	2,274	6,619
Share-based compensation expense	11,043	10,847
Deferred income taxes	21,760	64,788
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities	1,833	3,959
Changes in certain assets and liabilities:
(Increase) decrease in accounts receivable	38,005	17,709
(Increase) decrease in prepaid expenses	(6,709)	(8,825)
Increase (decrease) in accounts payable	(2,437)	3,671
Increase (decrease) in accrued liabilities	5,960	(11,183)
Increase (Decrease) in Air Traffic Liability	27,432	27,688
Change in deferred major maintenance	(21,699)	(14,779)
Other operating activities	(336)	(5,756)
Net cash provided by operating activities	290,123	302,082
INVESTING ACTIVITIES:
Purchase of investment securities	(263,057)	(273,796)
Proceeds from maturities of investment securities	355,325	239,920
Purchase of property and equipment, including capitalized interest	(273,999)	(333,746)
Other investing activities	(5,399)	1,338
Net cash used in investing activities	(187,130)	(366,284)
FINANCING ACTIVITIES:
Cash dividends paid to shareholders	(33,919)	(34,462)
Proceeds from the issuance of debt	191,724	292,540
Repurchase of common stock	(3,617)	(90,445)
Principal payments on debt and capital lease obligations	(171,438)	(88,026)
Other financing activities	4,687	(405)
Net cash (used in) provided by financing activities	(12,563)	79,202
Net change in cash, cash equivalents, and restricted cash	90,430	15,000
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT BEGINNING OF PERIOD	70,639	76,358
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH AT END OF PERIOD	161,069	91,358
CASH PAYMENTS FOR:
Interest paid, net of amount capitalized	43,751	31,733
Income tax refunds	$ 41,145	$ 18,757

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Unaudited) Reconciliation of Cash, Cash Equivalents, and Restricted Cash - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Consolidated Statements of Cash Flows (Parenthetical) [Abstract]
Cash and cash equivalents	$ 140,752	$ 59,449	$ 74,023
Restricted cash	20,317	11,190	17,335
TOTAL CASH, CASH EQUIVALENTS AND RESTRICTED CASH	$ 161,069	$ 70,639	$ 91,358	$ 76,358

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2018
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 has no independent operations, and all guarantees of the Company's publicly held debt are full and unconditional and joint and several. Any subsidiaries of the parent company other than the subsidiary guarantors are minor. 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, 2017 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 Standards Effective in Future Years In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards update ("ASU") 2016-02, "Leases (topic 842)." This standard will require certain leases with durations greater than twelve months to be recognized on the balance sheet as a lease liability and a corresponding right-of-use asset, and is effective for interim and annual reporting periods beginning after December 15, 2018 with early adoption permitted. The Company will adopt this standard effective January 1, 2019. In July 2018, the FASB issued ASU 2018-11, "Targeted Improvements - Leases (Topic 842)." This update provides an optional transition method that allows entities to elect to apply the standard prospectively at the adoption date, versus recasting the prior periods presented. If elected, the Company will recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company has not completed the assessment of this new standard but believes adoption will have a significant impact on its consolidated balance sheets due to the recognition of right-of-use assets and lease liabilities for certain leases currently accounted for as operating leases. It is not expected to significantly change the recognition, measurement or presentation of associated expenses within the consolidated statements of income or cash flows. Recently Adopted Standards In February 2018, the FASB issued ASU 2018-02, "Income Statement—Reporting Comprehensive Income (Topic 220)." This standard provides an option to reclassify stranded tax effects within accumulated other comprehensive income (loss) ("AOCI") to retained earnings. The Company adopted this standard effective January 1, 2018 and a one-time effect of $0.6 million has been reclassified from AOCI to retained earnings. In 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)" (the "New Revenue Standard"). Under this ASU and subsequently issued amendments, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration received. Entities may use a full retrospective approach or report the cumulative effect as of the date of adoption. The Company adopted this standard using the full retrospective transition method effective January 1, 2018 and recast prior year results. See Note 2, "Revenue Recognition" for more information on the financial impact of this adoption. Under the New Revenue Standard, revenue for all Air-related ancillary fees that are directly related to ticket revenue, such as seat fees and baggage fees, are no longer considered distinct performance obligations separate from passenger travel and are reclassified into passenger revenue. These are deemed part of the single performance obligation of providing passenger transportation. While the adoption of the New Revenue Standard did not have a significant effect on earnings, $150.1 million and $472.4 million of Air-related ancillary fees for the three and nine months ended September 30, 2018 , respectively, are now classified as passenger revenue. The adoption of the New Revenue Standard resulted in a net reduction to air traffic liability at December 31, 2017 of $5.9 million . This change resulted from the recognition of breakage revenue on issuance of credit vouchers that are expected to expire unused. In addition, recognition of revenues for fees associated with flight changes or cancellations are now deferred until the time of flight rather than being recognized at the time the fee is incurred. The Company recognizes revenue from the co-branded credit card program on the deferral method. Bank of America has issued The Allegiant World Mastercard® in which points are earned and awarded to cardholders in exchange for consideration received under an agreement with a seven year scheduled duration expiring in 2023. 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). Consideration received from the Company’s co-brand agreement is allocated between the two components based on the relative selling price of each deliverable. The Company applies 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 to be redeemed.

Revenue Recognition

Revenue Recognition	9 Months Ended
	Sep. 30, 2018
Revenue Recognition [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue Recognition Certain prior period amounts have been recast to conform to the adoption of the New Revenue Standard as shown in the tables below. Three Months Ended September 30, 2017 Nine Months Ended September 30, 2017 (in thousands, except per As Previously Reported Current Presentation As Previously Reported Current Presentation share data) Adjustments Adjustments Income Statement: Passenger revenue (1) $ 183,064 $ 132,244 $ 315,308 $ 615,777 $ 414,618 $ 1,030,395 Air-related charges 130,818 (130,818 ) — 407,789 (407,789 ) — Sales and marketing 13,884 — 13,884 36,744 3,963 40,707 Income tax provision 12,436 335 12,771 66,715 493 67,208 Net income 22,293 1,091 23,384 112,400 2,373 114,773 Diluted earnings per share $ 1.39 $ 0.06 $ 1.45 $ 6.85 $ 0.14 $ 6.99 (1) Passenger revenue previously reported as Scheduled service revenue. December 31, 2017 As Previously Current (in thousands) Reported Adjustments Presentation Balance Sheet: Air traffic liability $ 210,184 $ (5,885 ) $ 204,299 Deferred income taxes 118,492 521 119,013 Retained earnings 902,579 5,364 907,943 Passenger Revenue Passenger revenue is primarily composed of passenger ticket sales, credit voucher breakage, seat fees, baggage fees, and other travel-related services performed in conjunction with a passenger’s flight, as well as co-brand point redemptions as outlined below: Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Scheduled service $ 202,796 $ 183,294 $ 677,061 $ 618,368 Ancillary air-related charges 150,095 131,388 472,443 410,500 Co-brand redemptions 2,209 626 7,939 1,527 Total passenger revenue $ 355,100 $ 315,308 $ 1,157,443 $ 1,030,395 Scheduled service Passenger tickets . The Company provides scheduled air transportation on limited-frequency, nonstop flights predominantly between under-served cities and popular leisure destinations. 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 12 months and revenue associated with future travel will principally be recognized within this time frame. $192.6 million was recognized into passenger revenue during the nine months ended September 30, 2018 that was recorded in the air traffic liability balance of $204.3 million at December 31, 2017. Credit voucher breakage . The Company estimates the value of vouchers that will expire unused and recognizes such revenue at the time the credit voucher is issued. Ancillary air-related charges Air-related revenue is primarily composed of services performed in conjunction with a passenger's flight and includes baggage fees, the use of the Company’s website to purchase scheduled service transportation, advance seat assignments, and other services. Revenue for these services is recognized when the related transportation service is provided. Prior to the adoption of the New Revenue Standard, the majority of these fees were classified separately as Ancillary air-related charges. 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 current and non-current point liabilities (in thousands): 2018 Balance at January 1 $ 8,903 Points awarded 10,872 Points redeemed (7,939 ) Balance at September 30 $ 11,836 As of September 30, 2018, $8.1 million of the current points liability is reflected in Accrued liabilities and represents our current estimate of revenue to be recognized in the next twelve months based on historical trends, with the remaining balance reflected in Other noncurrent liabilities expected to be recognized into revenue in periods thereafter. See below, Third Party Products, for discussion of the marketing component. Third Party Products Third party products revenue is generated from the sale of hotel rooms, rental cars, ticket attractions and co-brand marketing revenue. Revenue from the sale of hotel rooms, rental cars, and ticket attractions is recognized at the time the product is utilized, such as the time a purchased hotel room is occupied. The Company follows the accounting standards for principal versus agent revenue arrangements to determine the amount of revenue to be recognized for each element of a bundled sale involving air-related charges and third party products, in addition to airfare. Revenue from the sale of third party products is recorded net (treatment as an agent) 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 transportation is provided. Other Revenue Other revenue is generated from leased aircraft, engines, and other miscellaneous sources. Lease revenue is recognized ratably over the lease term. Accounts Receivable Accounts receivable, reflected on the accompanying consolidated balance sheets, primarily consist of amounts due from credit card companies associated with passenger revenue. These receivables are short-term, generally settled within a few days of sale. Bad debt expense, which occurs in the form of credit card chargebacks, was not material in any period presented. Taxes and Fees 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.

Property and Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2018
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment Disclosure	Property and Equipment Property and equipment (in thousands): As of September 30, 2018 As of December 31, 2017 Flight equipment, including pre-delivery deposits $ 1,867,655 $ 1,539,433 Computer hardware and software 137,110 123,675 Land and buildings/leasehold improvements 88,882 77,409 Other property and equipment 75,529 48,446 Total property and equipment 2,169,176 1,788,963 Less accumulated depreciation and amortization (352,371 ) (276,548 ) Property and equipment, net $ 1,816,805 $ 1,512,415

Long-Term Debt

Long-Term Debt	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt and capital lease obligations (in thousands): As of September 30, 2018 As of December 31, 2017 Fixed-rate debt and capital lease obligations due through 2030 $ 644,116 $ 465,462 Variable-rate debt due through 2028 668,933 699,430 Total long-term debt and capital lease obligations, net of related costs 1,313,049 1,164,892 Less current maturities, net of related costs 654,697 214,761 Long-term debt and capital lease obligations, net of current maturities and related costs $ 658,352 $ 950,131 Weighted average fixed-interest rate on debt 5.3 % 5.4 % Weighted average variable-interest rate on debt 4.0 % 3.3 % Maturities of long-term debt and capital lease obligations for the remainder of 2018 and for the next five years and thereafter, in the aggregate, are: remaining in 2018 - $114.6 million ; 2019 - $570.2 million ; 2020 - $118.6 million ; 2021 - $91.9 million ; 2022 - $64.5 million ; and $353.2 million thereafter. Consolidated Variable Interest Entity 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. These evaluations are complex and involve judgment and the use of estimates and assumptions based on available historical information and management’s judgment, among other factors. 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 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. These borrowings bear interest at a blended rate of 4.0 percent , 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, as of September 30, 2018 . Senior Secured Revolving Credit Facility In 2015, the Company, through a wholly owned subsidiary, entered into a senior secured revolving credit facility under which it was entitled to borrow up to $56.0 million . In March 2018, the Company paid off the balance of the facility and amended it to increase the borrowing limit to $81.0 million . The amended facility has a term of 24 months and is based on the value of Airbus A320 series aircraft placed in the collateral pool. In July 2018, the Company drew down $46.9 million under this facility, and no principal payments have been made as of September 30, 2018 . Aircraft may remain in the collateral pool for up to two years, and those currently collateralized were placed into the pool in December 2016. The notes for the amounts borrowed under the facility bear interest at a floating rate based on LIBOR and are due on March 31, 2020. Other Secured Debt In September 2018, the Company entered into a senior secured credit facility under which it is able to borrow up to $75.0 million . In that same month, the Company borrowed $55.5 million under this agreement secured by three Airbus A320 series aircraft. The remaining $19.5 million , secured by one Airbus A320 series aircraft, was borrowed in October 2018. The borrowing bears interest at a floating rate based on LIBOR, payable in quarterly installments over seven years. In July 2018, the Company borrowed $34.5 million under a loan agreement secured by one Airbus A320 series aircraft. The note bears interest at a floating rate based on LIBOR, payable in quarterly installments over ten years. In June 2018, the Company borrowed $10.8 million under a loan agreement secured by various ground equipment. The note bears interest at a fixed rate of 4.2 percent per year, payable in monthly installments over five years. General Unsecured Senior Notes In June 2014, the Company completed an offering of $300.0 million aggregate principal amount of senior unsecured obligations (the "Notes") which will mature in July 2019. In December 2016, the Company completed an offering of an additional $150.0 million principal amount of these notes, which were issued at a price of 101.5 percent of the principal amount, plus accrued interest from July 15, 2016. The Notes bear interest at a rate of 5.5 percent per year, payable in cash semi-annually, on January 15th and July 15th of each year. The indenture pursuant to which the Notes were issued includes operating and financial restrictions on the Company. These restrictions limit or restrict, among other things, the Company’s ability and the ability of its restricted subsidiaries to (i) incur additional indebtedness; (ii) incur liens; (iii) make restricted payments (including paying dividends on, redeeming, repurchasing or retiring capital stock); (iv) make investments; and (v) consolidate, merge or sell all or substantially all of its assets. These covenants are subject to various exceptions and qualifications under the terms of the indenture. As of December 31, 2017 and September 30, 2018 , the Company exceeded the consolidated total leverage ratio limit, which could affect the ability to make restricted payments in future periods after exhaustion of various exceptions. However, it is not expected that this will have any impact on the restricted payments routinely made in the ordinary course of business. The calculation is made on a quarterly basis based on the trailing 12 months. Capital Leases The Company has capital lease obligations related to aircraft, which significantly impacted our recognized assets and liabilities as of September 30, 2018 , but did not result in any significant cash receipts or cash payments during the quarter.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
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. The fair value of the Company's derivative instrument is determined using standard valuation models. The significant inputs used in these models are readily available in public markets or can be derived from observable market transactions and therefore have been classified as Level 2. Inputs used in these standard valuation models for derivative instruments include the applicable exchange and interest rates. Financial instruments measured at fair value on a recurring basis (in thousands): As of September 30, 2018 As of December 31, 2017 Total Level 1 Level 2 Total Level 1 Level 2 Cash equivalents Money market funds $ 45,227 $ 45,227 $ — $ 1,297 $ 1,297 $ — Commercial paper 42,157 — 42,157 27,910 — 27,910 Municipal debt securities 2,053 — 2,053 2,782 — 2,782 Total cash equivalents 89,437 45,227 44,210 31,989 1,297 30,692 Short-term Commercial paper 143,961 — 143,961 108,678 — 108,678 Corporate debt securities 99,556 — 99,556 107,878 — 107,878 Municipal debt securities 27,191 — 27,191 101,290 — 101,290 Federal agency debt securities 12,227 — 12,227 31,428 — 31,428 US Treasury Bonds 1,681 — 1,681 3,407 — 3,407 Total short-term 284,616 — 284,616 352,681 — 352,681 Long-term Corporate debt securities 40,343 — 40,343 60,396 — 60,396 Federal agency debt securities 10,026 — 10,026 5,775 — 5,775 US Treasury Bonds 2,984 — 2,984 2,994 — 2,994 Municipal debt securities — — — 9,405 — 9,405 Derivative instruments — — — 282 — 282 Total long-term 53,353 — 53,353 78,852 — 78,852 Total financial instruments $ 427,406 $ 45,227 $ 382,179 $ 463,522 $ 1,297 $ 462,225 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 (in thousands): As of September 30, 2018 As of December 31, 2017 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Hierarchy Level Publicly held debt $ 450,679 $ 455,749 $ 451,321 $ 462,604 2 Non-publicly held debt 742,878 663,776 719,681 660,065 3 Total long-term debt $ 1,193,557 $ 1,119,525 $ 1,171,002 $ 1,122,669 Due to the short-term nature, carrying amounts of cash, cash equivalents, restricted cash, accounts receivable and accounts payable approximate fair value.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Stockholders' Equity	Shareholders’ Equity The Company is authorized by the Board of Directors to acquire up to $100.0 million of its stock through open market purchases under its share repurchase program. As repurchase authority is used, the Board of Directors has, to date, authorized additional expenditures for share repurchases. For the three and nine months ended September 30, 2018 and 2017, open market share repurchases consisted of the following: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Shares repurchased (not in thousands) (1) None None None 604,497 Average price per share NA NA NA $ 142.66 Total (in thousands) None None None $ 86,240 (1) Does not include shares withheld from employees for tax withholding obligations related to restricted stock vestings. During the nine months ended September 30, 2018 , the Company declared and paid recurring cash dividends of $2.10 per share, or $33.9 million .

Earnings per Share

Earnings per Share	9 Months Ended
	Sep. 30, 2018
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 nine months ended September 30, 2018 , 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 September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Basic: Net income $ 15,147 $ 23,384 $ 120,356 $ 114,773 Less net income allocated to participating securities (194 ) (331 ) (1,602 ) (1,784 ) Net income attributable to common stock $ 14,953 $ 23,053 $ 118,754 $ 112,989 Earnings per share, basic $ 0.94 $ 1.45 $ 7.46 $ 7.00 Weighted-average shares outstanding 15,957 15,852 15,929 16,142 Diluted: Net income $ 15,147 $ 23,384 $ 120,356 $ 114,773 Less net income allocated to participating securities (194 ) (330 ) (1,601 ) (1,782 ) Net income attributable to common stock $ 14,953 $ 23,054 $ 118,755 $ 112,991 Earnings per share, diluted $ 0.94 $ 1.45 $ 7.45 $ 6.99 Weighted-average shares outstanding 15,957 15,852 15,929 16,142 Dilutive effect of stock options and restricted stock 35 18 42 60 Adjusted weighted-average shares outstanding under treasury stock method 15,992 15,870 15,971 16,202 Participating securities excluded under two-class method (30 ) (8 ) (33 ) (42 ) Adjusted weighted-average shares outstanding under two-class method 15,962 15,862 15,938 16,160 For the three and nine months ended September 30, 2018 , anti-dilutive shares excluded from the calculation of earnings per share were 39,943 and 74,873 shares (not in thousands), respectively.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies As of September 30, 2018 , the Company had firm commitments to purchase ten Airbus A320 series aircraft. In addition, the Company has entered into lease agreements for 12 Airbus A320 aircraft, four of which have been delivered and are in service, and one of which has been delivered but was not in service as of September 30, 2018 . Future minimum fixed payments for the Company's commitments related to the acquisition of aircraft (including aircraft lease obligations), airport fees under use and lease agreements, and other operating lease obligations are as follows as of September 30, 2018 (in thousands): As of September 30, 2018 Remaining in 2018 $ 44,154 2019 116,322 2020 62,382 2021 21,248 2022 19,159 Thereafter 122,414 Total commitments $ 385,679 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.

Related Party

Related Party	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions Disclosure	Related Party Transactions During the three and nine months ended September 30, 2018 , no related party transactions occurred requiring disclosure. Entities owned or controlled by the Company's Chairman and CEO have been paid for the building of corporate training content. During the nine months ended September 30, 2017 , the Company made payments to these entities of $0.2 million . No further payments are expected.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events [Text Block]	Subsequent Events In October 2018, the Company executed a purchase agreement for one Airbus A320 series aircraft, for which delivery is expected in the second quarter 2019. Also in October 2018, the remaining $19.5 million was borrowed under a senior secured credit facility entered into by the Company in September, which is secured by one Airbus A320 series aircraft.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies - (Policies)	9 Months Ended
	Sep. 30, 2018
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 has no independent operations, and all guarantees of the Company's publicly held debt are full and unconditional and joint and several. Any subsidiaries of the parent company other than the subsidiary guarantors are minor. 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, 2017 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 Standards Effective in Future Years In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards update ("ASU") 2016-02, "Leases (topic 842)." This standard will require certain leases with durations greater than twelve months to be recognized on the balance sheet as a lease liability and a corresponding right-of-use asset, and is effective for interim and annual reporting periods beginning after December 15, 2018 with early adoption permitted. The Company will adopt this standard effective January 1, 2019. In July 2018, the FASB issued ASU 2018-11, "Targeted Improvements - Leases (Topic 842)." This update provides an optional transition method that allows entities to elect to apply the standard prospectively at the adoption date, versus recasting the prior periods presented. If elected, the Company will recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. The Company has not completed the assessment of this new standard but believes adoption will have a significant impact on its consolidated balance sheets due to the recognition of right-of-use assets and lease liabilities for certain leases currently accounted for as operating leases. It is not expected to significantly change the recognition, measurement or presentation of associated expenses within the consolidated statements of income or cash flows. Recently Adopted Standards In February 2018, the FASB issued ASU 2018-02, "Income Statement—Reporting Comprehensive Income (Topic 220)." This standard provides an option to reclassify stranded tax effects within accumulated other comprehensive income (loss) ("AOCI") to retained earnings. The Company adopted this standard effective January 1, 2018 and a one-time effect of $0.6 million has been reclassified from AOCI to retained earnings. In 2014, the FASB issued ASU 2014-09, "Revenue from Contracts with Customers (Topic 606)" (the "New Revenue Standard"). Under this ASU and subsequently issued amendments, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration received. Entities may use a full retrospective approach or report the cumulative effect as of the date of adoption. The Company adopted this standard using the full retrospective transition method effective January 1, 2018 and recast prior year results. See Note 2, "Revenue Recognition" for more information on the financial impact of this adoption. Under the New Revenue Standard, revenue for all Air-related ancillary fees that are directly related to ticket revenue, such as seat fees and baggage fees, are no longer considered distinct performance obligations separate from passenger travel and are reclassified into passenger revenue. These are deemed part of the single performance obligation of providing passenger transportation. While the adoption of the New Revenue Standard did not have a significant effect on earnings, $150.1 million and $472.4 million of Air-related ancillary fees for the three and nine months ended September 30, 2018 , respectively, are now classified as passenger revenue. The adoption of the New Revenue Standard resulted in a net reduction to air traffic liability at December 31, 2017 of $5.9 million . This change resulted from the recognition of breakage revenue on issuance of credit vouchers that are expected to expire unused. In addition, recognition of revenues for fees associated with flight changes or cancellations are now deferred until the time of flight rather than being recognized at the time the fee is incurred. The Company recognizes revenue from the co-branded credit card program on the deferral method. Bank of America has issued The Allegiant World Mastercard® in which points are earned and awarded to cardholders in exchange for consideration received under an agreement with a seven year scheduled duration expiring in 2023. 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). Consideration received from the Company’s co-brand agreement is allocated between the two components based on the relative selling price of each deliverable. The Company applies 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 to be redeemed.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies Disaggregation of Revenue (Tables)	9 Months Ended
	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Disaggregation of Revenue [Table Text Block]	Passenger revenue is primarily composed of passenger ticket sales, credit voucher breakage, seat fees, baggage fees, and other travel-related services performed in conjunction with a passenger’s flight, as well as co-brand point redemptions as outlined below: Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Scheduled service $ 202,796 $ 183,294 $ 677,061 $ 618,368 Ancillary air-related charges 150,095 131,388 472,443 410,500 Co-brand redemptions 2,209 626 7,939 1,527 Total passenger revenue $ 355,100 $ 315,308 $ 1,157,443 $ 1,030,395

Revenue Recognition (Tables)

Revenue Recognition (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue Recognition [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	Certain prior period amounts have been recast to conform to the adoption of the New Revenue Standard as shown in the tables below. Three Months Ended September 30, 2017 Nine Months Ended September 30, 2017 (in thousands, except per As Previously Reported Current Presentation As Previously Reported Current Presentation share data) Adjustments Adjustments Income Statement: Passenger revenue (1) $ 183,064 $ 132,244 $ 315,308 $ 615,777 $ 414,618 $ 1,030,395 Air-related charges 130,818 (130,818 ) — 407,789 (407,789 ) — Sales and marketing 13,884 — 13,884 36,744 3,963 40,707 Income tax provision 12,436 335 12,771 66,715 493 67,208 Net income 22,293 1,091 23,384 112,400 2,373 114,773 Diluted earnings per share $ 1.39 $ 0.06 $ 1.45 $ 6.85 $ 0.14 $ 6.99 (1) Passenger revenue previously reported as Scheduled service revenue. December 31, 2017 As Previously Current (in thousands) Reported Adjustments Presentation Balance Sheet: Air traffic liability $ 210,184 $ (5,885 ) $ 204,299 Deferred income taxes 118,492 521 119,013 Retained earnings 902,579 5,364 907,943
Disaggregation of Revenue [Table Text Block]	Passenger revenue is primarily composed of passenger ticket sales, credit voucher breakage, seat fees, baggage fees, and other travel-related services performed in conjunction with a passenger’s flight, as well as co-brand point redemptions as outlined below: Three Months Ended September 30, Nine Months Ended September 30, (in thousands) 2018 2017 2018 2017 Scheduled service $ 202,796 $ 183,294 $ 677,061 $ 618,368 Ancillary air-related charges 150,095 131,388 472,443 410,500 Co-brand redemptions 2,209 626 7,939 1,527 Total passenger revenue $ 355,100 $ 315,308 $ 1,157,443 $ 1,030,395
Contract with Customer, Asset and Liability [Table Text Block]	The following table presents the activity of the current and non-current point liabilities (in thousands): 2018 Balance at January 1 $ 8,903 Points awarded 10,872 Points redeemed (7,939 ) Balance at September 30 $ 11,836

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	Property and equipment (in thousands): As of September 30, 2018 As of December 31, 2017 Flight equipment, including pre-delivery deposits $ 1,867,655 $ 1,539,433 Computer hardware and software 137,110 123,675 Land and buildings/leasehold improvements 88,882 77,409 Other property and equipment 75,529 48,446 Total property and equipment 2,169,176 1,788,963 Less accumulated depreciation and amortization (352,371 ) (276,548 ) Property and equipment, net $ 1,816,805 $ 1,512,415

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Summary of Long-Term Debt	Long-term debt and capital lease obligations (in thousands): As of September 30, 2018 As of December 31, 2017 Fixed-rate debt and capital lease obligations due through 2030 $ 644,116 $ 465,462 Variable-rate debt due through 2028 668,933 699,430 Total long-term debt and capital lease obligations, net of related costs 1,313,049 1,164,892 Less current maturities, net of related costs 654,697 214,761 Long-term debt and capital lease obligations, net of current maturities and related costs $ 658,352 $ 950,131 Weighted average fixed-interest rate on debt 5.3 % 5.4 % Weighted average variable-interest rate on debt 4.0 % 3.3 %

Long-Term Debt Schedule of Matu

Long-Term Debt Schedule of Maturities (Tables)	9 Months Ended
	Sep. 30, 2018
Schedule of Maturities of Long-Term Debt [Abstract]
Schedule of Maturities of Long-term Debt	Maturities of long-term debt and capital lease obligations for the remainder of 2018 and for the next five years and thereafter, in the aggregate, are: remaining in 2018 - $114.6 million ; 2019 - $570.2 million ; 2020 - $118.6 million ; 2021 - $91.9 million ; 2022 - $64.5 million ; and $353.2 million thereafter.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Assets Measured at Fair Value On a Recurring Basis	Financial instruments measured at fair value on a recurring basis (in thousands): As of September 30, 2018 As of December 31, 2017 Total Level 1 Level 2 Total Level 1 Level 2 Cash equivalents Money market funds $ 45,227 $ 45,227 $ — $ 1,297 $ 1,297 $ — Commercial paper 42,157 — 42,157 27,910 — 27,910 Municipal debt securities 2,053 — 2,053 2,782 — 2,782 Total cash equivalents 89,437 45,227 44,210 31,989 1,297 30,692 Short-term Commercial paper 143,961 — 143,961 108,678 — 108,678 Corporate debt securities 99,556 — 99,556 107,878 — 107,878 Municipal debt securities 27,191 — 27,191 101,290 — 101,290 Federal agency debt securities 12,227 — 12,227 31,428 — 31,428 US Treasury Bonds 1,681 — 1,681 3,407 — 3,407 Total short-term 284,616 — 284,616 352,681 — 352,681 Long-term Corporate debt securities 40,343 — 40,343 60,396 — 60,396 Federal agency debt securities 10,026 — 10,026 5,775 — 5,775 US Treasury Bonds 2,984 — 2,984 2,994 — 2,994 Municipal debt securities — — — 9,405 — 9,405 Derivative instruments — — — 282 — 282 Total long-term 53,353 — 53,353 78,852 — 78,852 Total financial instruments $ 427,406 $ 45,227 $ 382,179 $ 463,522 $ 1,297 $ 462,225
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 (in thousands): As of September 30, 2018 As of December 31, 2017 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Hierarchy Level Publicly held debt $ 450,679 $ 455,749 $ 451,321 $ 462,604 2 Non-publicly held debt 742,878 663,776 719,681 660,065 3 Total long-term debt $ 1,193,557 $ 1,119,525 $ 1,171,002 $ 1,122,669

Stockholders' Equity Repurchase

Stockholders' Equity Repurchases (Tables)	9 Months Ended
	Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Treasury Stock [Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Shares repurchased (not in thousands) (1) None None None 604,497 Average price per share NA NA NA $ 142.66 Total (in thousands) None None None $ 86,240

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Sep. 30, 2018
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 September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Basic: Net income $ 15,147 $ 23,384 $ 120,356 $ 114,773 Less net income allocated to participating securities (194 ) (331 ) (1,602 ) (1,784 ) Net income attributable to common stock $ 14,953 $ 23,053 $ 118,754 $ 112,989 Earnings per share, basic $ 0.94 $ 1.45 $ 7.46 $ 7.00 Weighted-average shares outstanding 15,957 15,852 15,929 16,142 Diluted: Net income $ 15,147 $ 23,384 $ 120,356 $ 114,773 Less net income allocated to participating securities (194 ) (330 ) (1,601 ) (1,782 ) Net income attributable to common stock $ 14,953 $ 23,054 $ 118,755 $ 112,991 Earnings per share, diluted $ 0.94 $ 1.45 $ 7.45 $ 6.99 Weighted-average shares outstanding 15,957 15,852 15,929 16,142 Dilutive effect of stock options and restricted stock 35 18 42 60 Adjusted weighted-average shares outstanding under treasury stock method 15,992 15,870 15,971 16,202 Participating securities excluded under two-class method (30 ) (8 ) (33 ) (42 ) Adjusted weighted-average shares outstanding under two-class method 15,962 15,862 15,938 16,160

Commitments and Contingencies P

Commitments and Contingencies Payments Related to Commitments to Purchase (Tables)	9 Months Ended
	Sep. 30, 2018
Payments Related to Commitments to Purchase [Abstract]
Long-term Purchase Commitment [Table Text Block]	Future minimum fixed payments for the Company's commitments related to the acquisition of aircraft (including aircraft lease obligations), airport fees under use and lease agreements, and other operating lease obligations are as follows as of September 30, 2018 (in thousands): As of September 30, 2018 Remaining in 2018 $ 44,154 2019 116,322 2020 62,382 2021 21,248 2022 19,159 Thereafter 122,414 Total commitments $ 385,679

Summary of Significant Accoun_4

Summary of Significant Accounting Policies Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018	Dec. 31, 2017
Adjustments for New Accounting Pronouncements [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets					$ 600
Passenger revenue	$ 355,100	$ 315,308	$ 1,157,443	$ 1,030,395
Sales and marketing	16,798	13,884	54,224	40,707
Income Tax Expense (Benefit)	(732)	12,771	26,494	67,208
Net income	$ 15,147	$ 23,384	$ 120,356	$ 114,773
Diluted earnings per share	$ 0.94	$ 1.45	$ 7.45	$ 6.99
Air traffic liability	$ (231,731)		$ (231,731)			$ (204,299)
Deferred income taxes	140,555		140,555			119,013
Retained earnings	$ 994,942		$ 994,942			907,943
Calculated under Revenue Guidance in Effect before Topic 606
Adjustments for New Accounting Pronouncements [Line Items]
Passenger revenue		$ 183,064		$ 615,777
Air-related charges		130,818		407,789
Sales and marketing		13,884		36,744
Income Tax Expense (Benefit)		12,436		66,715
Net income		$ 22,293		$ 112,400
Diluted earnings per share		$ 1.39		$ 6.85
Air traffic liability						(210,184)
Deferred income taxes						118,492
Retained earnings						902,579
Difference between Revenue Guidance in Effect before and after Topic 606
Adjustments for New Accounting Pronouncements [Line Items]
Passenger revenue		$ 132,244		$ 414,618
Air-related charges		(130,818)		(407,789)
Sales and marketing				3,963
Income Tax Expense (Benefit)		335		493
Net income		$ 1,091		$ 2,373
Diluted earnings per share		$ 0.06		$ 0.14
Air traffic liability						5,885
Deferred income taxes						521
Retained earnings						$ 5,364

Revenue Recognition (Details)

Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 355,100	$ 315,308	$ 1,157,443	$ 1,030,395
Scheduled Service Revenue
Disaggregation of Revenue [Line Items]
Passenger revenue	202,796	183,294	677,061	618,368
Air-related revenue
Disaggregation of Revenue [Line Items]
Passenger revenue	150,095	131,388	472,443	410,500
Co-brand Revenue
Disaggregation of Revenue [Line Items]
Passenger revenue	$ 2,209	626	$ 7,939	1,527
Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Passenger revenue		183,064		615,777
Air-related charges		$ 130,818		$ 407,789

Revenue Recognition Points Liab

Revenue Recognition Points Liability (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Points Liability [Abstract]
Points Liability Start of Period	$ 8,903
Points awarded	10,872
Points redeemed	(7,939)
Contract with Customer, Liability	11,836
Points Liability	$ 8,100

Revenue Recognition Passenger R

Revenue Recognition Passenger Revenue (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Revenue Recognition [Abstract]
Increase (Decrease) in Deferred Air Traffic Revenue	$ 192,600
Air traffic liability	$ 231,731	$ 204,299

Revenue Recognition Disaggregat

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Adjustments for New Accounting Pronouncements [Line Items]
Air Traffic Liability, Current	$ 231,731		$ 231,731		$ 204,299
Deferred Tax Liabilities, Net, Noncurrent	140,555		140,555		119,013
Retained Earnings (Accumulated Deficit)	994,942		994,942		907,943
Passenger Revenue	355,100	$ 315,308	1,157,443	$ 1,030,395
Selling and Marketing Expense	16,798	13,884	54,224	40,707
Income Tax Expense (Benefit)	(732)	12,771	26,494	67,208
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 15,147	$ 23,384	$ 120,356	$ 114,773
Earnings Per Share, Diluted	$ 0.94	$ 1.45	$ 7.45	$ 6.99
Calculated under Revenue Guidance in Effect before Topic 606
Adjustments for New Accounting Pronouncements [Line Items]
Air Traffic Liability, Current					210,184
Deferred Tax Liabilities, Net, Noncurrent					118,492
Retained Earnings (Accumulated Deficit)					902,579
Passenger Revenue		$ 183,064		$ 615,777
Air-related charges		130,818		407,789
Selling and Marketing Expense		13,884		36,744
Income Tax Expense (Benefit)		12,436		66,715
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 22,293		$ 112,400
Earnings Per Share, Diluted		$ 1.39		$ 6.85
Difference between Revenue Guidance in Effect before and after Topic 606
Adjustments for New Accounting Pronouncements [Line Items]
Air Traffic Liability, Current					(5,885)
Deferred Tax Liabilities, Net, Noncurrent					521
Retained Earnings (Accumulated Deficit)					$ 5,364
Passenger Revenue		$ 132,244		$ 414,618
Air-related charges		(130,818)		(407,789)
Selling and Marketing Expense				3,963
Income Tax Expense (Benefit)		335		493
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		$ 1,091		$ 2,373
Earnings Per Share, Diluted		$ 0.06		$ 0.14

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Flight equipment, including pre-delivery deposits	$ 1,867,655	$ 1,539,433
Computer hardware and software	137,110	123,675
Land and buildings/leasehold improvements	88,882	77,409
Other property and equipment	75,529	48,446
Total property and equipment	2,169,176	1,788,963
Less accumulated depreciation and amortization	352,371	276,548
Property and equipment, net	$ 1,816,805	$ 1,512,415

Long-Term Debt Components of Lo

Long-Term Debt Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Notes Payable	$ 1,193,557	$ 1,171,002
Secured Long-term Debt, Noncurrent	1,313,049	1,164,892
Less current maturities	654,697	214,761
Long-term debt and capital leases, net of current maturities and related costs	658,352	950,131
Fixed-rate debt and capital lease obligations due through 2030
Debt Instrument [Line Items]
Notes Payable	644,116	465,462
Variable-rate debt due through 2028
Debt Instrument [Line Items]
Notes Payable	$ 668,933	$ 699,430
Weighted average fixed-interest rate on debt
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	5.30%	5.40%
Weighted average variable-interest rate on debt
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	4.00%	3.30%

Long-Term Debt (Details)

Long-Term Debt (Details) - USD ($) $ in Thousands	Oct. 01, 2018	Dec. 31, 2016	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 01, 2016	Dec. 31, 2015	Jun. 01, 2014
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year			$ 114,600
Long-term Debt, Maturities, Repayments of Principal in Year Two			570,200
Long-term Debt, Maturities, Repayments of Principal in Year Three			118,600
Long-term Debt, Maturities, Repayments of Principal in Year Four			91,900
Long-term Debt, Maturities, Repayments of Principal in Year Five			64,500
Long-term Debt, Maturities, Repayments of Principal after Year Five			353,200
Secured Long-term Debt, Noncurrent			1,313,049			$ 1,164,892
Consolidated Variable Interest Entity
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities			44,000
Variable Interest Entity, Consolidated, Carrying Amount, Assets			$ 37,800
Debt, Weighted Average Interest Rate			4.00%
Senior Secured Revolving Credit Facility
Line of Credit Facility, Maximum Borrowing Capacity					$ 81,000			$ 56,000
Line of Credit Facility, Fair Value of Amount Outstanding			$ 46,900
Secured Debt September 2018
Debt Instrument, Face Amount			55,500
Line of Credit Facility, Maximum Borrowing Capacity			75,000
Secured Debt July 2018
Debt Instrument, Face Amount			34,500
Secured Debt June 2018
Debt Instrument, Face Amount			$ 10,800
Debt Instrument, Interest Rate, Stated Percentage			4.20%
Unsecured Debt
Unsecured Long-term Debt, Noncurrent							$ 150,000		$ 300,000
Debt Instrument, Redemption Price, Percentage		101.50%
Debt Instrument, Interest Rate, Stated Percentage				5.50%
Airbus A320 Aircraft Series | Consolidated Variable Interest Entity
Debt Instrument, Collateral			1
Airbus A320 Aircraft Series | Secured Debt September 2018
Debt Instrument, Collateral			3
Airbus A320 Aircraft Series | Secured Debt July 2018
Debt Instrument, Collateral			1
Subsequent Event [Member]
Debt Instrument, Face Amount	$ 19,500
Subsequent Event [Member] | Airbus A320 Aircraft Series
Debt Instrument, Collateral	1

Long-Term Debt Schedule of Ma_2

Long-Term Debt Schedule of Maturities of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	$ 114,600
Long-term Debt, Maturities, Repayments of Principal in Year Two	570,200
Long-term Debt, Maturities, Repayments of Principal in Year Three	118,600
Long-term Debt, Maturities, Repayments of Principal in Year Four	91,900
Long-term Debt, Maturities, Repayments of Principal in Year Five	64,500
Long-term Debt, Maturities, Repayments of Principal after Year Five	353,200
Long-term Debt, Fair Value	$ 1,313,049	$ 1,164,892

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Measurements, Recurring
Available-for-sale Securities	$ 427,406	$ 463,522
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Available-for-sale Securities	45,227	1,297
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Available-for-sale Securities	382,179	462,225
Short-term Investments | Fair Value, Measurements, Recurring
Available-for-sale Securities	284,616	352,681
Short-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Available-for-sale Securities	284,616	352,681
Short-term Investments | Fair Value, Measurements, Recurring | Commercial paper
Available-for-sale Securities	143,961	108,678
Short-term Investments | Fair Value, Measurements, Recurring | Commercial paper | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Fair Value, Measurements, Recurring | Commercial paper | Fair Value, Inputs, Level 2
Available-for-sale Securities	143,961	108,678
Short-term Investments | Fair Value, Measurements, Recurring | Federal agency debt securities
Available-for-sale Securities	12,227	31,428
Short-term Investments | Fair Value, Measurements, Recurring | Federal agency debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Fair Value, Measurements, Recurring | Federal agency debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	12,227	31,428
Short-term Investments | Fair Value, Measurements, Recurring | Municipal debt securities
Available-for-sale Securities	27,191	101,290
Short-term Investments | Fair Value, Measurements, Recurring | Municipal debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Fair Value, Measurements, Recurring | Municipal debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	27,191	101,290
Short-term Investments | Fair Value, Measurements, Recurring | Corporate debt securities
Available-for-sale Securities	99,556	107,878
Short-term Investments | Fair Value, Measurements, Recurring | Corporate debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Fair Value, Measurements, Recurring | Corporate debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	99,556	107,878
Short-term Investments | Fair Value, Measurements, Recurring | US Treasury Securities
Available-for-sale Securities	1,681	3,407
Short-term Investments | Fair Value, Measurements, Recurring | US Treasury Securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Short-term Investments | Fair Value, Measurements, Recurring | US Treasury Securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	1,681	3,407
Long Term Investments | Municipal debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | Municipal debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	0	9,405
Long Term Investments | Fair Value, Measurements, Recurring
Available-for-sale Securities	53,353	78,852
Long Term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Available-for-sale Securities	53,353	78,852
Long Term Investments | Fair Value, Measurements, Recurring | Federal agency debt securities
Available-for-sale Securities	10,026	5,775
Long Term Investments | Fair Value, Measurements, Recurring | Federal agency debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | Fair Value, Measurements, Recurring | Federal agency debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	10,026	5,775
Long Term Investments | Fair Value, Measurements, Recurring | Municipal debt securities
Available-for-sale Securities	0	9,405
Long Term Investments | Fair Value, Measurements, Recurring | Corporate debt securities
Available-for-sale Securities	40,343	60,396
Long Term Investments | Fair Value, Measurements, Recurring | Corporate debt securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | Fair Value, Measurements, Recurring | Corporate debt securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	40,343	60,396
Long Term Investments | Fair Value, Measurements, Recurring | US Treasury Securities
Available-for-sale Securities	2,984	2,994
Long Term Investments | Fair Value, Measurements, Recurring | US Treasury Securities | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | Fair Value, Measurements, Recurring | US Treasury Securities | Fair Value, Inputs, Level 2
Available-for-sale Securities	2,984	2,994
Long Term Investments | Fair Value, Measurements, Recurring | Derivative Financial Instruments, Assets
Available-for-sale Securities	0	282
Long Term Investments | Fair Value, Measurements, Recurring | Derivative Financial Instruments, Assets | Fair Value, Inputs, Level 1
Available-for-sale Securities	0	0
Long Term Investments | Fair Value, Measurements, Recurring | Derivative Financial Instruments, Assets | Fair Value, Inputs, Level 2
Available-for-sale Securities	0	282
Cash Equivalents | Fair Value, Measurements, Recurring
Cash Equivalents	89,437	31,989
Cash Equivalents | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Cash Equivalents	45,227	1,297
Cash Equivalents | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Cash Equivalents	44,210	30,692
Cash Equivalents | Fair Value, Measurements, Recurring | US Treasury Bonds
Cash Equivalents	45,227	1,297
Cash Equivalents | Fair Value, Measurements, Recurring | US Treasury Bonds | Fair Value, Inputs, Level 1
Cash Equivalents	45,227	1,297
Cash Equivalents | Fair Value, Measurements, Recurring | US Treasury Bonds | Fair Value, Inputs, Level 2
Cash Equivalents	0	0
Cash Equivalents | Fair Value, Measurements, Recurring | Commercial paper
Cash Equivalents	42,157	27,910
Cash Equivalents | Fair Value, Measurements, Recurring | Commercial paper | Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents | Fair Value, Measurements, Recurring | Commercial paper | Fair Value, Inputs, Level 2
Cash Equivalents	42,157	27,910
Cash Equivalents | Fair Value, Measurements, Recurring | Municipal debt securities
Cash Equivalents	2,053	2,782
Cash Equivalents | Fair Value, Measurements, Recurring | Municipal debt securities | Fair Value, Inputs, Level 1
Cash Equivalents	0	0
Cash Equivalents | Fair Value, Measurements, Recurring | Municipal debt securities | Fair Value, Inputs, Level 2
Cash Equivalents	$ 2,053	$ 2,782

Fair Value Measurements Estimat

Fair Value Measurements Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	$ 1,313,049	$ 1,164,892
Notes Payable	1,193,557	1,171,002
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	1,119,525	1,122,669
Publicly Held Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	450,679	451,321
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	455,749	462,604
Non-Publicly Held Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured Long-term Debt, Noncurrent	742,878	719,681
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	$ 663,776	$ 660,065

Stockholders' Equity (Details)

Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 100,000		$ 100,000
Dividends Payable, Amount Per Share	$ 2.10		$ 2.10
Stock Repurchased During Period, Shares	0	0	0	604,497
Treasury Stock Acquired, Average Cost Per Share				$ 142.66
Stock Repurchased During Period, Value	$ 0	$ 0	$ 0	$ 86,240
Payments of Dividends			$ 33,919	$ 34,462

Earnings per Share (Details)

Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	39,943		74,873
Basic:
Net income attributable to Allegiant Travel Company (in Dollars)	$ 15,147	$ 23,384	$ 120,356	$ 114,773
Less: Net income allocated to participating securities (in Dollars)	(194)	(331)	(1,602)	(1,784)
Net income attributable to common stock (in Dollars)	$ 14,953	$ 23,053	$ 118,754	$ 112,989
Net income per share, basic (in Dollars per share)	$ 0.94	$ 1.45	$ 7.46	$ 7
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted	$ (194)	$ (330)	$ (1,601)	$ (1,782)
Net Income (Loss) Available to Common Stockholders, Diluted	$ 14,953	$ 23,054	$ 118,755	$ 112,991
Diluted earnings per share	$ 0.94	$ 1.45	$ 7.45	$ 6.99
Weighted-average shares outstanding	15,957,000	15,852,000	15,929,000	16,142,000
Dilutive effect of stock options, restricted stock and stock-settled stock appreciation rights	35,000	18,000	42,000	60,000
Adjusted weighted-average shares outstanding under treasury stock method	15,992,000	15,870,000	15,971,000	16,202,000
Participating securities excluded under two-class method	(30,000)	(8,000)	(33,000)	(42,000)
Two-Class Method, Weighted Average Number of Shares Outstanding, Diluted	15,962,000	15,862,000	15,938,000	16,160,000

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)aircraft
Long-term Purchase Commitment [Line Items]
Number Of Aircraft Committed To Purchase | aircraft	10
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	$ 44,154
Unrecorded Unconditional Purchase Obligation, Due within Two Years	116,322
Unrecorded Unconditional Purchase Obligation, Due within Three Years	62,382
Unrecorded Unconditional Purchase Obligation, Due within Four Years	21,248
Unrecorded Unconditional Purchase Obligation, Due within Five Years	19,159
Unrecorded Unconditional Purchase Obligation, Due after Five Years	122,414
Unrecorded Unconditional Purchase Obligation	$ 385,679
Airbus A320 Aircraft Series
Long-term Purchase Commitment [Line Items]
Number of Aircraft Committed to be Leased | aircraft	12
Airbus A320 Aircraft Series, In Service
Long-term Purchase Commitment [Line Items]
Aircraft acquired | aircraft	4
Airbus A320 Aircraft Series, Not In Service
Long-term Purchase Commitment [Line Items]
Aircraft acquired | aircraft	1

Commitments and Contingencies_2

Commitments and Contingencies Payments Related to Commitments to Purchase (Details) $ in Thousands	Sep. 30, 2018USD ($)
Payments Related to Commitments to Purchase [Abstract]
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	$ 44,154
Unrecorded Unconditional Purchase Obligation, Due within Two Years	116,322
Unrecorded Unconditional Purchase Obligation, Due within Three Years	62,382
Unrecorded Unconditional Purchase Obligation, Due within Four Years	21,248
Unrecorded Unconditional Purchase Obligation, Due within Five Years	19,159
Unrecorded Unconditional Purchase Obligation, Due after Five Years	122,414
Unrecorded Unconditional Purchase Obligation	$ 385,679

Related Party (Details)

Related Party (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction	$ 0.2

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	Oct. 01, 2018USD ($)aircraft	Sep. 30, 2018aircraft
Subsequent Event [Line Items]
Number Of Aircraft Committed To Purchase		10
Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount | $	$ 19.5
Airbus A320 Aircraft Series | Subsequent Event [Member]
Subsequent Event [Line Items]
Number Of Aircraft Committed To Purchase	1
Debt Instrument, Collateral	1