Harbor Diversified (HRBR) 10-K 10 Jul 20 2019 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2020	May 31, 2020	Jun. 28, 2019
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	HARBOR DIVERSIFIED, INC.
Entity Central Index Key	0000899394
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	No
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Interactive Data Current	Yes
Entity Small Business	true
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity File Number	001-34584
Entity Incorporation State Country Code	DE
Entity Tax Identification Number	13-3697002
Entity Address Address Line1	W6390 Challenger Drive
Entity Address Address Line2	Suite 203
Entity Address City Or Town	Appleton
Entity Address Postal Zip Code	54914-9120
Entity Address State Or Province	WI
City Area Code	920
Local Phone Number	749-4188
Entity Common Stock, Shares Outstanding			54,863,305
Entity Public Float				$ 1,046,000
Document Annual Report	true
Document Transition Report	false
Subsequent Event [Member]
Document Information [Line Items]
Entity Public Float		$ 2,743,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 69,454	$ 60,257
Restricted cash	819	814
Accounts receivable, less allowance of $129 in 2019 and $363 in 2018	5,525	9,514
Spare parts and supplies, less allowances of $8,389 in 2019 and $7,129 in 2018	7,819	8,676
Contract costs	400	400
Prepaid aircraft rent		27,396
Prepaid expenses and other	1,003	3,542
Total Current Assets	85,020	110,599
Property and Equipment
Flight property and equipment	242,613	242,004
Ground property and equipment	8,305	7,211
Building leasehold improvements		4,509
Less accumulated depreciation	(99,680)	(95,336)
Net Property and Equipment	151,238	158,388
Other Assets
Operating lease right of use asset	24,026
Intangibles	5,300	5,300
Long-term investments	4,275	4,275
Long-term contract costs	867	1,268
Other	1,906	1,833
Total Other Assets	36,374	12,676
Total Assets	272,632	281,663
Current Liabilities
Accounts payable	16,608	25,079
Accrued payroll and employee benefits	15,474	15,846
Current portion of operating lease liability	6,311
Other accrued expenses	327	1,323
Contract liabilities	8,342	7,226
Income taxes payable	213	313
Current portion of long-term debt (stated principal amount of $7,198 in both 2019 and 2018)	12,845	7,198
Total Current Liabilities	60,120	56,985
Other Liabilities
Long-term debt (stated principal amount of $96,988 in 2019 and $92,397 in 2018)	107,838	108,894
Long-term promissory note	4,275	4,275
Deferred tax liability	2,599	1,855
Long-term operating lease liability	10,538
Long-term contract liabilities	8,086	11,510
Other	1,655	1,409
Total Long-Term Liabilities	134,991	127,943
Commitments and Contingencies (Note 8)
Shareholders' Equity
Common stock	555	555
Additional paid-incapital	288,980	288,980
Retained deficit	(211,533)	(192,319)
Treasury stock	(481)	(481)
Total Shareholders' Equity	77,521	96,735
Total Liabilities and Shareholders' Equity	$ 272,632	$ 281,663

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivables	$ 129	$ 363
Inventory allowances valuation reserves	8,389	7,129
Current portion of long-term debt principal amount	7,198	7,198
Non-current portion of long term debt principal amount	$ 96,988	$ 92,397

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Revenues
Total Operating Revenues	$ 263,605	$ 240,610
Operating Expenses
Payroll and related costs	126,505	125,094
Aircraft fuel and oil	172	129
Aircraft maintenance, materials and repairs	57,827	55,118
Aircraft rent	43,118	32,945
Other rents	8,372	9,523
Depreciation, amortization and obsolescence	25,238	22,145
Purchased services and other	23,235	20,154
Total Operating Expenses	284,467	265,108
Loss From Operations	(20,862)	(24,498)
Other Income (Expense)
Interest income	1,271	1,012
Interest expense	(1,806)	(13,450)
Gain on extinguishment of debt		198,729
Other	2,505	14,396
Total Other Income (Expense)	1,970	200,687
Net (Loss) Income Before Taxes	(18,892)	176,189
Income Tax Expense (Benefit)	322	(5,124)
Net (Loss) Income	$ (19,214)	$ 181,313
Basic earnings (loss) per share	$ (0.35)	$ 3.30
Diluted earnings (loss) per share	$ (0.35)	$ 3.27
Weighted average common shares:
Basic	54,863	54,863
Diluted	54,863	55,422
Contract Revenue [Member]
Operating Revenues
Total Operating Revenues	$ 263,495	$ 240,552
Contract Service and Other [Member]
Operating Revenues
Total Operating Revenues	$ 110	$ 58

Consolidated Statements of Shar

Consolidated Statements of Shareholders Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]		Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]
Beginning Balance at Dec. 31, 2017	$ (79,158)		$ 555		$ (481)	$ 288,980	$ (368,212)
Beginning balance, Shares at Dec. 31, 2017			54,863	[1]	618
Impact of adoption of new accounting standards | Accounting Standards Update (ASU) 2014-09 [Member]		$ (5,420)						$ (5,420)
Net income	181,313						181,313
Ending Balance at Dec. 31, 2018	96,735		$ 555		$ (481)	288,980	(192,319)
Ending balance, shares at Dec. 31, 2018			54,863	[1]	618
Net income	(19,214)						(19,214)
Ending Balance at Dec. 31, 2019	$ 77,521		$ 555		$ (481)	$ 288,980	$ (211,533)
Ending balance, shares at Dec. 31, 2019			54,863	[1]	618
[1]	Common stock, $.01 par value, 100,000 shares authorized and 55,481 shares issued at December 31, 2019 and 2018. Shares outstanding at December 2019 and 2018 were 54,863

Consolidated Statements of Sh_2

Consolidated Statements of Shareholders Equity (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Common stock par value	$ 0.01	$ 0.01
Common stock share autorized	100,000,000	100,000,000
Common stock share issued	55,481,000	55,481,000
Common stock share outstanding	54,863,000	54,863,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash Flows From Operating Activities
Net (loss) income	$ (19,214)	$ 181,313
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, amortization and obsolescence allowance	25,238	22,145
Aircraft lease termination costs	19,353
Amortization of contract costs	(3,725)	(3,480)
Amortization of engine overhauls	4,067	3,613
Deferred income taxes	744	(4,359)
Loss on disposition of property	2,528	225
Gain on extinguishment of debt		(198,729)
Debt restructuring costs		(641)
Changes in operating assets and liabilities:
Accounts receivable	3,989	(1,654)
Spare parts and supplies	(402)	1,266
Prepaid expenses and other	2,466	(4,995)
Operating lease right of use asset	(1,987)
Accounts payable	(7,706)	(3,401)
Accrued payroll and employee benefits	(372)	1,560
Other accrued expenses	(996)	4,985
Contract liabilities	1,417	12,941
Income taxes payable	(100)	146
Other long-term liabilities	246	4,663
Net Cash Provided by Operating Activities	25,546	15,598
Cash Flows From Investing Activities
Restricted cash	(5)	(4)
Additions to property and equipment	(21,498)	(31,583)
Proceeds on disposition of property and equipment	562	131
Net Cash Used in Investing Activities	(20,941)	(31,456)
Cash Flows From Financing Activities
Repayments of long-term debt	(7,198)
Proceeds from note payable	11,790	15,199
Net Cash Provided by Financing Activities	4,592	15,199
Increase (Decrease) in Cash and Cash Equivalents	9,197	(659)
Cash and Cash Equivalents, beginning of year	60,257	60,916
Cash and Cash Equivalents, end of year	$ 69,454	$ 60,257

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. Summary of Significant Accounting Policies Basis of Presentation The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and include the accounts of Harbor Diversified, Inc. and subsidiaries (collectively, Harbor or the Company). The Company’s subsidiaries consist of its wholly owned subsidiaries, Harbor Therapeutics, Inc. (which is a non-operating Description of Operations The Company is comprised of principal lines of business focused on (1) providing air transportation (airline business), (2) acquiring aircraft rotable equipment for the purpose of leasing to Air Wisconsin and (3) providing flight equipment financing to Air Wisconsin. The airline business is operated entirely through Air Wisconsin, an independent regional air carrier that is engaged in the business of providing scheduled passenger service under capacity purchase agreements (CPA) with United Airlines, Inc. (United or UA), and American Airlines, Inc. (American or AA). See Note 3 to the financial statements for further information regarding the service agreements with these partner airlines. The CPA with AA ended in February 2018. As of December 31, 2019, Air Wisconsin operated as a United Express carrier primarily in Chicago (O’Hare) and Washington, D. C. (Dulles). Segment Reporting Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing operating performance. In consideration of ASC 280, “ Segment Reporting As further discussed below, all of our operating revenue in 2019 and 2018 was derived from operations associated with our United or American CPAs. It is currently impractical to provide certain information on our revenue from our customers for our services and geographic information on our revenues and long-lived assets. Contract and Other Revenues In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2014-09, The major airline partners make provisional cash payments to the Company during each month of service based on monthly flight schedules and the provisional cash payments are reconciled based on actual completed flights after each month’s flight activity is completed. As a lessor, for our aircraft operated under our CPA, we have historically accounted for the non-lease non-lease Under the nonrefundable up-front up-front 340-40, up-front The Company recognizes revenue under its CPAs with United and American over time as the service is provided. For the year ended December 31, 2019, revenue from the CPA with United represented 100% of contract revenues. For the year ended December 31, 2018, contract revenues from the Company’s CPAs with United and American were 97.2% and 2.8%, respectively. United pays the Company a fixed rate for each departure and block hour (measured from takeoff to landing, including taxi time), and a fixed amount per aircraft each month, with additional incentives primarily based on flight completion, on-time For the year ended December 31, 2019 2018 Capacity purchase agreements revenue: flight operations $ 263,495 $ 123,375 Capacity purchase agreements revenue: aircraft lease — 117,177 Contract Revenues $ 263,495 $ 240,552 A portion of the Company’s compensation under the CPA is designed to reimburse the Company for certain aircraft ownership costs. For the year ended December 31, 2018, the consideration received for the use of the aircraft under the Company’s CPA is reflected as lease revenue, inasmuch as the agreements identify the “right of use” of a specific number of aircraft over a stated period of time. Under the application of ASC 840 for the year ended December 31, 2018, the Company is required to apply the allocation objective of the new revenue recognition standard (Topic 606) to the lease and non-lease The property associated with the aircraft lease had a cost of $45,896, accumulated depreciation of $5,851, and a net carrying value of $40,045 at December 31, 2018. The contingent variable revenue associated with the aircraft lease for the year ended December 31, 2018 was $57,252. The Company’s CPA with United includes weekly provisional cash payments based on a projected level of flying each month. The Company and United subsequently reconcile these payments to the actual completed flight activity on a monthly basis. Under the CPA with United, the Company is eligible to receive incentive compensation upon the achievement of certain performance criteria. The incentives are defined in the CPA and are measured and determined on a monthly basis. At the end of each month during the term of the CPA, the Company calculates the incentives achieved during that period and recognizes revenue attributable to the CPA accordingly, subject to the variable constraint guidance under Topic 606. Other revenues are immaterial and primarily consist of the sales of parts to other airlines. The transaction price for the sale of these parts generally occurs at fair market value. Cash and Cash Equivalents Investments and deposits with a maturity of three months or less when acquired and money market funds are considered cash and cash equivalents. Restricted Cash Restricted cash represents amounts escrowed in an interest-bearing account relating to the Company’s letters of credit. Spare Parts and Supplies Expendable parts are stated at average cost less an obsolescence allowance. The Company provides for an allowance for obsolescence after considering the useful life of the aircraft fleet, the estimated cost of expendable parts expected to be on hand at the end of the useful life and the estimated salvage value of the parts. This allowance is based on management estimates and are subject to change. Expendable parts are charged to expense when used. Expendable parts that are repairable are returned to inventory at the average cost of comparable parts, less a reserve for scrap. Supplies are stated at average cost. Property and Equipment and Depreciation Property and equipment are stated at cost and depreciated over their useful lives to their estimated residual values using the straight-line method as follows: Assets Depreciable Life Current Residual Value Aircraft 7 years $ 50,000 Rotable parts 7 years 10 % Spare engines 7 years $ 25,000 Ground equipment up to 10 years 0 % Office equipment up to 10 years 0 % Leasehold improvements Shorter of asset or lease life 0 % Capitalized engine maintenance costs are amortized over their estimated useful life measured in remaining engine cycles to the next scheduled shop event. Depreciation expense in 2019 and 2018 was $23,578 and $20,363, respectively, and is included in depreciation, amortization, and obsolescence in the accompanying statements of operations. Impairment of Long-Lived Assets The Company evaluates long-lived assets for potential impairment and records impairment losses on long-lived assets when events and circumstances indicate the assets might be impaired and the undiscounted cash flows estimated to be generated by those assets are less than their carrying amounts. Impairment losses are measured by comparing the fair value of the assets to their carrying amounts. In determining the need to record impairment charges, the Company is required to make certain estimates regarding such things as the current fair market value of the assets and future net cash flows to be generated by the assets. If there are subsequent changes to these estimates, or if actual results differ from these estimates, such changes could impact the financial statements in the future. Certain factors occurring in 2017 and 2018 resulted in an impairment triggering event that required the Company to evaluate the carrying value of its long-lived property and equipment assets. Such factors included, but were not limited to, the early termination of aircraft residual value guarantees; significantly increased costs to recruit and retain pilots; the termination of the CPA with American Airlines; transition costs associated with the flying agreement with UA; and significantly reduced revenue from UA to cover the Company’s aircraft ownership costs. After reviewing for impairment, the Company recorded an impairment charge during the year ended December 31, 2017. The Company has determined that no further impairment charges on property and equipment were needed for the years ended December 31, 2019 and 2018. Intangible Assets Indefinite-lived intangible assets are not subject to amortization but are subject to an annual assessment for impairment by applying a fair value-based test. The trade names and the air carrier certificate have indefinite lives, therefore, there is no amortization. Maintenance The Company operates its aircraft under a continuous inspection and maintenance program. The normal cost of recurring maintenance is expensed when incurred except for planned major maintenance activities for engines where the deferral method of accounting is applied. Income Taxes The Company utilizes the asset and liability method for accounting for income taxes. Under the asset and liability method, deferred tax assets and liabilities are determined based upon the estimated future tax effects of differences between the financial statement and tax basis of assets and liabilities, as measured by the current applicable tax rates. Deferred tax expense represents the result of changes in deferred tax assets and liabilities. As required by the uncertain tax position guidance, the Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more-likely-than-not more-likely-than-not The Company is subject to income taxes in the United States (U.S.) federal jurisdiction and various state jurisdictions. Tax regulations within each jurisdiction are subject to the interpretation of the related tax laws and regulations and require significant judgment to apply. The Company is no longer subject to U.S. federal income tax examinations for the years prior to 2015. With few exceptions, the Company is no longer subject to state, and local income tax examinations for the years prior to 2014. As of December 31, 2019, the Company had no outstanding tax examinations. The Company recognizes interest and penalties related to unrecognized tax benefits in income tax expense for all periods presented. The Company had accrued $121 and $252 for the payment of interest and penalties at December 31, 2019 and 2018, respectively. Comprehensive Income The Company does not have any components of comprehensive income and, as of December 31, 2019 and 2018, comprehensive income is equal to net income reported in the statements of operations. Concentration of Credit Risk The Company at times has had cash in excess of the Federal Deposit Insurance Corporation (FDIC) insurance limit. As of December 31, 2019, there were no bank deposits that exceeded the FDIC insurance limits. Substantially all the Company’s revenues in 2019 and 2018 were derived from United (see Note 3). Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States 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 could differ from those estimates. Fair Value of Financial Instruments The Company’s financial instruments include cash and cash equivalents, restricted cash, accounts receivable, long-term investments, accounts payable, and long-term debt. The Company believes the carrying amounts of these financial instruments are a reasonable estimate of their fair value because of the short-term nature of such instruments, or in the case of long-term debt, because of interest rates available to the Company for similar obligations. Long-term investments are held-to-maturity debt securities and are reported at amortized cost. Fair value is defined as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date (that is, an exit price). Accounting Standards Codification (ASC) 820 establishes a three-tier fair value hierarchy, which prioritizes inputs used in fair value. The tiers are as follows: Level 1 - Quoted market prices in active markets for identical assets or liabilities. Level 2 - Inputs other than Level 1 inputs that are either directly or indirectly observable. Level 3 - Unobservable inputs developed using the Company’s estimates and assumptions, which reflect those that market participants would use. The determination of where an asset or liability falls in the hierarchy requires significant judgment. The Company evaluates its hierarchy disclosures annually and based on various factors, it is possible that an asset or liability may be classified differently from year to year. However, the Company expects that changes in classifications between different levels will be rare. The Company classifies money market funds and deposits as Level 1 and long-term investments as Level 2. There have been no transfers between Level 1 and Level 2 investments during 2019. Recently Adopted Standards: ASU 2014-09 In May 2014, the FASB issued Accounting Standards Update No. 2014-09, The Company recast certain prior period amounts to conform to the adoption of Topic 606, as shown in the tables below (in thousands): Balance Sheet Previously Reported Adjustment As Adjusted Assets Contract costs $ — $ 400 $ 400 Long-term contract costs — 1,268 1,268 Total Assets $ — $ 1,668 $ 1,668 Liabilities Contract liability $ — $ 3,725 $ 3,725 Long-term contract liability — 11,510 11,510 Total Liabilities $ — $ 15,235 $ 15,235 The $1,668 and the $15,235 adjustment to contract assets and contract liabilities, respectively, reflects the amount of capitalized up-front up-front up-front In December 2019 and 2018, the Company received payments of $5,539 and $4,999 from UA for services to be rendered in January 2020 and January 2019, respectively. The Company recast the December 31, 2018, amount of $4,999 from accounts payable to contract liabilities on the balance sheet. These customer deposits have been recorded as contract liabilities in the balance sheets as of December 31, 2019 and 2018, and recorded as revenue in January 2020 and 2019, respectively. The statement of operations was recast as follows for the year ended December 31, 2018 (in thousands): For the Year Ended Previously Adjustments As Operating Revenues Contract revenues $ 243,272 $ (2,720 ) $ 240,552 Operating Expenses Aircraft maintenance repair 51,879 3,239 55,118 Amortization expense 21,745 400 22,145 Loss from Operations (18,139 ) (6,359 ) (24,498 ) Income Tax (Benefit) (4,297 ) (827 ) (5,124 ) Net Income $ 186,845 $ (5,532 ) $ 181,313 Explanations for each of the adjustments above are as follows: • Contract revenues – revenue of $6,200 was deferred as a contract liability and is partially offset by the amortization of the contract liability in the amount of $3,480. • Aircraft maintenance and repair – cost incurred in preparing the aircraft for service which were previously treated as a reimbursed expense. • Amortization expense – amortization of capitalized contract costs. • Income tax benefit – changes due to Topic 606 resulted in an increased loss from operations in the amount of $6,359. This resulted in an income tax benefit and additional deferred tax asset in the amount of $1,284, offset by the creation of a federal and state valuation allowance of $457 on deferred tax assets. Recently Adopted Standards: ASU 2016-02 In February 2016, the FASB issued ASU No. 2016-02, 2016-02 No. 2018-11, Additionally, the Company’s adoption of Topic 842 did not have a significant impact on the recognition, measurement or presentation of lease revenue and lease expenses within the financial statements of operations and statement of cash flows. The Company’s prepaid aircraft rents and accrued aircraft rents that were separately stated in the Company’s December 31, 2018 balance sheet have been classified as a component of the Company’s right-of-use As a result of the adoption of the new lease accounting guidance, the Company recognized the following ROU assets and lease liabilities as of January 1, 2019: Right-of-use $ 70,892 Lease liabilities – operating leases $ 40,921

Liquidity and Management's Plan

Liquidity and Management's Plan, COVID-19	12 Months Ended
	Dec. 31, 2019
Text Block [Abstract]
Liquidity and Management's Plan, COVID-19	2. Liquidity and Management’s Plan, COVID-19 The Company’s ability to meet its liquidity needs is dependent upon generating cash flows from operations in the future in amounts sufficient to meet its obligations and repay its liabilities arising from normal business operations when they come due. There can be no assurance that the Company’s operations will be sufficiently profitable to meet its liquidity needs. During 2019, the Company’s operations reflected the full effect of operating its fleet entirely under the United CPA compared to 2018; with the substantial growth in its pilot workforce, together with scheduling enhancements which improved crew productivity, the Company’s 2019 block hours increased year-over-year approximately 10 percent. The Company in 2019 also implemented a number of cost reduction measures and liquidity management actions, including decreasing expenses with third party vendors through competitive bidding processes, strategically reviewing whether to eliminate employee positions caused by attrition, and creating efficiencies through a realignment of its crew domiciles and maintenance bases. On January 30, 2020, the World Health Organization WHO announced a global health emergency because of a new strain of a novel coronavirus (COVID-19) in Wuhan, China and warned of the risks to the international community as the virus spreads globally beyond its point of origin. In March 2020, the WHO classified the COVID-19 In response to the reduction in flying demand due to the COVID-19 COVID-19 “shelter-in-place” “stay-at-home” COVID-19 pre-COVID-19 The full impact of the COVID-19 COVID-19 Since a portion of the Company’s revenue is fixed due to the structure of its United CPA, the impact to the Company from the COVID-19 COVID-19 COVID-19 In response to these developments, the Company has implemented cost saving initiatives seeking to mitigate the impact of the COVID-19 (1) Reducing employee-related costs, including: (i) Offering voluntary short-term unpaid leaves to employees, (ii) Suspending all pay increases and bonuses for salaried employees, and (iii) Instituting a company-wide hiring freeze. (2) Reducing other non-employee (i) Delaying planned heavy airframe maintenance events, (ii) Delaying maintenance events associated with engines and rotable parts, (iii) Reducing or suspending certain discretionary spending, and (iv) Reducing rent payments on certain leased engines. The Company’s primary lender (see Note 6) has agreed to defer approximately $5,000 of interest payments otherwise due in the period from March 31, 2020, through September 29, 2020. All deferred amounts are due in a lump sum payment on September 30, 2020, per the letter agreement dated March 30, 2020. Although the agreement is to pay the full amount back on September 30, 2020, the Company may seek more favorable repayment terms from the lender. There is no certainty as to whether the repayment terms will be able to be modified. On March 27, 2020, President Trump signed into law the CARES Act. The Company is examining the impact that the CARES Act may have on its business. In addition to the cost saving measures outlined above, on April 6, 2020, the Company applied to a lender for a $10,000 loan under the small business Paycheck Protection Program (PPP) established under the CARES Act and administered by the SBA (SBA Loan). The application was processed and approved through the SBA system, and the full loan amount of $10,000 was received by the Company on April 13, 2020. The application for these funds required the Company to certify in good faith that current economic uncertainty made the loan request necessary to support the ongoing operations of the Company. The Company was also required to certify that the loan funds would be used to retain workers and maintain payroll or make mortgage payments, lease payments, and utility payments. The SBA Loan has a two-year non-payroll In addition, on April 20, 2020, the Company entered into a Payroll Support Program Agreement (PSP Agreement) with respect to payroll support (Treasury Payroll Support) from the U.S. Department of Treasury (Treasury) with respect to the payroll support program (Payroll Support Program) under the CARES Act, pursuant to which the Company expects to receive approximately $41,000 in the aggregate, of which approximately $20,499 has been received. The remaining amount is expected to be paid to the Company in three equal payments of $6,833 each from July to September 2020. The payments are subject to adjustment in Treasury’s sole discretion. The PSP Agreement contains various covenants, including that the payroll support proceeds must be used exclusively for the payment of wages, salaries and benefits, that the Company cannot involuntarily terminate or furlough any employee prior to October 1, 2020, and that the Company cannot reduce any employee’s pay rates or benefits prior to October 1, 2020, without that employee’s consent. Given the measures discussed above that the Company has implemented to address its historical net losses from operations and to mitigate the impact of the COVID-19

Service Agreements

Service Agreements	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Service Agreements	3. Service Agreements American Airlines, Inc. In February 2005, the Company and US Airways, Inc. entered into a CPA under which the Company agreed to provide regional jet service through December 31, 2015, operating 70 CRJ-200 mid-February Under the terms of the CPA, the Company was paid fees by AA for the number of aircraft in the fleet, completed block hours, completed departures, available seat miles (ASMs), and certain other amounts based on the Company’s performance measured against certain performance criteria. United Airlines, Inc. On February 26, 2017, the Company entered into a CPA with United Airlines, Inc. to operate up to 65 CRJ-200 two-year two-year

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Property and Equipment	4. Property and Equipment The following presents the Company’s aircraft as of December 31, 2019 and 2018. December 31, 2019 Owned Leased CRJ-200 51 13 December 31, 2018 Owned Leased CRJ-200 37 26 As part of an agreement reached in January 2018 Bombardier Inc. (BBD) agreed to pay the Company $25,192 in installments through September 2019 provided that BBD had the right to deliver to the Company the unencumbered title to certain CRJ-200 On July 1, 2019, BBD exercised its right under the agreement and delivered to the Company 14 CRJ-200 The Company recorded the 14 CRJ-200 • Right-of-use • Unamortized engine overhauls of $9,535, recorded under “Flight property and equipment” on the Balance Sheet, related to the 28 engines acquired as part of the transaction. • Leasehold improvements with a remaining book value of $738 and included on the Balance Sheet as “Flight property and equipment,” related to the 14 acquired aircraft. The delivery in mid-2019 CRJ-200

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	5. Income Taxes The income tax provision consists of the following (the 2018 amounts have been recast in accordance with Note 1 above): Year ended December 31, 2019 2018 Current Benefit Federal $ (247 ) $ (753 ) State (174 ) (10 ) Total Current Benefit (421 ) (763 ) Deferred Expense (Benefit) Federal 789 (2,095 ) State (46 ) (2,266 ) Total Deferred Expense (Benefit) 743 (4,361 ) Income Tax Expense (Benefit) $ 322 $ (5,124 ) The following is a reconciliation between a federal income tax rate of 21% in for the years ended December 31, 2019 and 2018 of income before income taxes and the effective tax rate which is derived by dividing the provision (benefit) for income taxes by the income before the provision for income taxes (in thousands): Year ended December 31, 2019 2018 Computed provision for income taxes at the statutory rate $ (3,964 ) $ 37,000 Increase (decrease) in income taxes resulting from: State income tax provision, net of federal income tax benefit (830 ) (2,880 ) Non-deductible 241 198 Gain on troubled debt restructuring — (44,981 ) Loss of tax attributes — 14,322 Valuation allowance changes affecting the provision for income taxes 5,873 (9,562 ) Return to provision adjustments (954 ) (125 ) Other, net (46 ) 904 Provision (benefit) for income taxes $ 322 $ (5,124 ) As of December 31, 2019, the Company recorded $6,330 of valuation allowance against certain deferred tax assets primarily associated with federal and state net operating losses. As of December 31, 2018, the company recorded $457 of valuation allowance against certain deferred tax assets primarily associated with state net operating losses. The increase in the valuation allowance for 2019 was primarily based on federal and state net operating losses generated in 2019. Deferred tax assets and liabilities reflect temporary differences between financial and tax reporting. Significant components of deferred tax assets and liabilities are as follows: December 31, 2019 2018 Deferred Tax Assets Accruals and reserves not currently deductible $ 6,631 $ 7,084 Federal NOL and interest expense limitation carryovers 13,796 286 State NOL and interest expense limitation carryovers 1,106 39 Accrued and deferred compensation 2,888 2,809 Prepaid items 1,198 2,432 Lease liability 4,052 — Contract liability 2,543 3,242 Residual value guarantee settlement — 2,568 Other 1,010 849 Subtotal before valuation allowance 33,224 19,309 Less: valuation allowance (6,330 ) (457 ) Total Deferred Tax Assets 26,894 18,852 Deferred Tax Liabilities Property and equipment (24,696 ) (20,701 ) Right-of-use (4,791 ) — Other (6 ) (6 ) Total Deferred Tax Liabilities (29,493 ) (20,707 ) Net Deferred Income Tax Liabilities $ (2,599 ) $ (1,855 ) At December 31, 2019 and 2018, the Company had federal net operating losses of approximately $60,940 and $0, and state net operating losses of approximately $17,897 and $509, respectively. The estimated effective tax rate applicable to the federal and state net operating losses are 21.0% and 3.1%, respectively. The federal net operating loss is not subject to an expiration date but is subject to an 80% of taxable income limitation, while the Company expects the state net operating losses to begin to expire in 2024. State net operating losses differ with respect to expiration dates and limitations dependent on state specific regulations. For the year ended December 31, 2019 and 2018, the Company had a federal business interest carryforward of $4,724 and $1,360, respectively. These amounts, as well as future interest deductions, are subject to a limitation of 30% of adjusted taxable income. For the years ended December 31, 2019 and 2018, the Company recorded a valuation allowance of $6,330 and $457, respectively, against federal and state deferred tax assets consisting of net operating loss carryovers and interest expense limitation carryovers. As the Company was in a cumulative loss position as of December 31, 2019 and 2018, the reversal of existing temporary differences was used to determine the extent to which valuation allowances were recorded. The Company has no ongoing federal or state examinations. Federal tax years 2016, 2017, and 2018 are open to examination. As a result of the troubled debt restructuring in 2018, any remaining federal and state net operating loss and tax credit carryovers were eliminated, and therefore any related deferred tax assets and valuation allowances have also been reduced as of December 31, 2018. Under ASC Topic 740, the accounting guidance related to uncertain tax positions requires that the impact of a tax position be recognized in the financial statements if that position is more likely than not of being sustained on audit, based on the technical merits of the position. A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2019 and 2018 is as follows (in thousands): December 31, 2019 2018 Unrecognized tax benefits at the beginning of the year $ 388 $ 278 Gross increases – current year tax positions — 128 Gross decreases – lapse of statute (140 ) (18 ) Unrecognized tax benefits at the end of the year $ 248 $ 388 Interest and penalties in year-end $ 121 $ 252

Debt

Debt	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Debt	6. Debt Long-Term Debt Long-term debt consists of the following (with interest rates as of December 31, 2019 and December 31, 2018): December 31, 2019 2018 Notes due December 31, 2025, 4.0% (a) $ 86,497 $ 86,497 Credit Agreements due through 2022, 5.0% (b) 34,186 29,595 Total debt 120,683 116,092 Less: current maturities 12,845 7,198 Long-Term Debt $ 107,838 $ 108,894 (a) On December 24, 2018, Air Wisconsin entered into a debt restructuring agreement with a lender (Lender), which held certain senior aircraft notes and subordinated aircraft notes. Under the agreement the senior aircraft notes were exchanged for Notes in the aggregate principal amount of $70,000 (Aircraft Notes) and the subordinated aircraft notes were cancelled. The Aircraft Notes bear interest at the rate of 4% per annum. Air Wisconsin concluded the restructuring should be classified as a troubled debt restructuring and, as such, future undiscounted interest payments of $16,497 were capitalized as part of the carrying value of the debt. (b) Air Wisconsin entered into a credit agreement with the Lender in June 2017 in the amount of $14,397, and a second credit agreement in January 2018 in the amount of $15,198, which was subsequently amended in December 2018 and again in June 2019 for additional funding of $5,755 and $6,034, respectively, and to extend the maturity date. The loans made by the Lender under these two credit agreements (Other Loans) have an interest rate of 5% and maturity dates of December 31, 2020 and June 30, 2022, respectively. Aircraft Notes In seven separate transactions occurring in 2003 and 2004, Air Wisconsin financed the acquisition of 35 CRJ-200 6-month 15-months, 18-months In April 2016, the Lender, as the holder of the senior aircraft notes, the holder of the subordinated aircraft notes, and a loan trustee entered into a deferral agreement which was amended several times between April 14, 2016 and February 16, 2018. This agreement, as amended: (i) Deferred certain scheduled principal and interest payments on the senior aircraft notes and the subordinated aircraft notes through June 30, 2019; (ii) Imposed certain restrictions on Air Wisconsin’s ability to make payments to affiliates; (iii) Imposed an obligation on Air Wisconsin to perform certain engine maintenance through June 30, 2019; and (iv) Required Air Wisconsin to grant to a trustee for the benefit of the lenders security interests in certain unencumbered aircraft, engines and spare parts. On January 25, 2018, Air Wisconsin, the Lender, as the holder of the senior aircraft notes, and the holder of the subordinated aircraft notes entered into an omnibus restructuring agreement whereby, among other things, the holder of the subordinated aircraft notes assigned all of its rights and interest in the subordinated aircraft notes and certain other notes payable due 2020 to the Lender. On December 24, 2018, Air Wisconsin and the Lender entered into a debt restructuring agreement whereby: (i) The senior aircraft notes were exchanged for the Aircraft Notes in an aggregate principal amount of $70,000; (ii) The aggregate principal balance outstanding under the senior aircraft notes in excess of $70,000, the entire aggregate principal balance outstanding under the subordinated aircraft notes and certain notes payable due 2020, and all interest accrued on the senior aircraft notes and the subordinated aircraft notes prior to the restructuring date, including deferred amounts, was forgiven and deemed paid in full; (iii) The interest rate for the Aircraft Notes was reset to 4.0% per annum; (iv) Commencing on June 30, 2021, there is mandatory amortization of the Aircraft Notes in the aggregate amount of $3,500 semi-annually; (v) Certain additional mandatory prepayments based on excess cash flow are required; and (vi) The maturity date of the Aircraft Notes was extended to December 31, 2025. The Aircraft Notes are secured by Air Wisconsin’s owned aircraft and certain spare engines and spare parts. Air Wisconsin concluded the restructuring should be classified as a troubled debt restructuring and recorded a gain of $198,611 in 2018. Accordingly, the carrying value of the restructured debt was reduced to the expected future undiscounted cash flows related to its repayment, which includes future principal and interest payments of $70,000 and $16,497, respectively. Other Loans On June 5, 2017, Air Wisconsin and the Lender entered into a credit agreement under which Air Wisconsin borrowed $14,397. The Other Loans under the 2017 credit agreement have an interest rate of 5% and a maturity date of December 31, 2020 and are secured by Air Wisconsin’s owned aircraft and certain spare engines and spare parts. On January 25, 2018, Air Wisconsin entered into a second credit agreement with the Lender to borrow $15,198 in 2018. On December 24, 2018, the Lender and Air Wisconsin entered into a first amendment to that 2018 credit agreement in which the Lender agreed to make an additional loan in the amount of $5,755 on April 30, 2019. In April 2019, Air Wisconsin entered into a second amendment with respect to the 2018 credit agreement that extended the due date of one of the payments due in the amount of $7,273 from July 2019 to July 2020. As of December 31, 2018, the $7,273 payment was included in long-term debt on the balance sheet. In June 2019, Air Wisconsin entered into a third amendment to the 2018 credit agreement that changed the due date of the installment payment of $7,273, due July 2020, to December 2021. The amendment also provided Air Wisconsin the option to make the March 2020 and June 2020 payments under the 2017 credit agreement in December 2019, which totaled $7,198. In return, the December 2019 payment under the 2018 credit agreement, in the amount of $7,925, would be deferred to be made into two installments of $3,963 each due in March and June of 2022. Air Wisconsin exercised this option. The June 2019 amendment also increased the loan amount of the 2018 credit agreement by $6,034, to a total of $26,987, and the amendment extended the maturity date to June 30, 2022, at which time the $6,034 is also due. The Other Loans under the 2018 credit agreement have an interest rate of 5% and a maturity date of June 30, 2022 and are secured by Air Wisconsin’s owned aircraft and certain spare engines and spare parts. Air Wisconsin concluded that the amendments discussed above should be classified as a troubled debt restructuring due to the Lender granting changes to the amortization schedule and extending the loan maturity dates in the amendments. March 30, 2020 Deferral Agreement On March 30, 2020, Air Wisconsin entered into a Letter Agreement with the Lender to defer all principal and interest payments on the Aircraft Notes and the Other Loans that would otherwise be due from March 31, 2020 through September 29, 2020 to September 30, 2020. Under this agreement Air Wisconsin deferred a payment of $3,918 due in March 2020 and will defer a second payment of $1,118 due in June 2020. Maturities of long-term debt for the years subsequent to December 31, 2019, are as follows: Fiscal Year Amount 2020 $ 12,845 2021 22,758 2022 23,410 2023 9,170 2024 8,890 Thereafter 43,610 Total $ 120,683 The debt agreements include provisions and certain non-financial Long-Term Promissory Note In July 2003, Air Wisconsin financed a hangar through the issuance of $4,275 City of Milwaukee, Wisconsin variable rate Industrial Development Bonds. The bonds mature November 1, 2033. Prior to May 1, 2006, the bonds were secured by a guaranteed investment contract, which was collateralized with cash and interest was payable semiannually on each May 1 and November 1. On May 1, 2006, Air Wisconsin acquired the bonds using the cash collateral. The bonds are reported as long-term investments on the balance sheets. The hangar is accounted for as a right-of-use asset.

Lease Obligations

Lease Obligations	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Lease Obligations	7. Lease Obligations Effective January 1, 2019, the Company adopted Topic 842. The Company leases property and equipment under operating leases. For leases with durations longer than 12 months, the Company recorded the related operating lease right-of-use For all underlying classes of assets, the Company has elected to not recognize ROU assets and lease liabilities for short-term leases that have a lease term of 12 months or less at lease commencement and do not include an option to purchase the underlying asset that the Company is reasonably certain to exercise. Leases containing termination clauses in which either party may terminate the lease without cause and the notice period is less than 12 months are deemed short-term leases with lease costs included in rent expense. As of December 31, 2019, the Company’s right-of-use The table below presents operating lease related terms and discount rates as of December 31, 2019: Weighted-average remaining lease term 4.04 years Weighted-average discount rate 7.02 % Components of lease costs were as follows for the year ended December 31, 2019: Operating lease cost $ 27,624 Short-term lease cost 4,331 Variable lease cost 182 Lease termination expense 19,353 Total lease cost $ 51,490 As of December 31, 2019, the Company leased or subleased certain aircraft and engines, training simulators, and facilities. Rent expense recorded under these leases was $51,490 and $42,468 in 2019 and 2018, respectively. The following table summarizes the future minimum rental payments required under operating leases that had initial or remaining non-cancelable Fiscal Year Amount 2020 $ 7,384 2021 3,975 2022 3,906 2023 2,722 2024 1,087 Thereafter 987 Total lease payments 20,061 Less imputed interest (2,104 ) Total lease liabilities $ 17,957

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	8. Commitments and Contingencies Legal Matters The Company is subject to certain legal actions, which it considers routine to its business activities. As of December 31, 2019, management believes, after consultation with legal counsel, that the ultimate outcome of such legal matters will not have a material adverse effect on the Company’s financial position, liquidity, or results of operations. Standby Letters of Credit As of December 31, 2019, the Company had ten outstanding letters of credit in the total amount of $814 to guarantee the performance of Company obligations in certain lease agreements and insurance policies. The Company’s restricted cash secures the letters of credit. The following table sets forth our cash obligations as of December 31, 2019: Payment Due for Year Ending December 31, (in thousands) Total 2020 2021 2022 2023 2024 Thereafter Aircraft Notes principal $ 70,000 $ — $ 7,000 $ 7,000 $ 7,000 $ 7,000 $ 42,000 Aircraft Notes interest $ 16,497 $ 5,647 $ 2,729 $ 2,451 $ 2,170 $ 1,890 $ 1,610 Other Loans principal $ 34,186 $ 7,198 $ 13,029 $ 13,959 $ — $ — $ — Other Loans interest $ 3,193 $ 1,664 $ 1,230 $ 299 $ — $ — $ — Operating lease obligations $ 20,061 $ 7,384 $ 3,975 $ 3,906 $ 2,722 $ 1,087 $ 987 Total $ 143,937 $ 21,893 $ 27,963 $ 27,615 $ 11,892 $ 9,977 $ 44,597 As of December 31, 2019, we had no variable rate notes in our total long-term debt.

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Retirement Plans	9. Retirement Plans The Company has defined contribution retirement plans that cover substantially all employees. The Company contributes to these plans. Total expense under all plans for 2019 and 2018 was $4,467 and $4,043, respectively.

Related-Party Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2019
Related Party Transactions [Abstract]
Related-Party Transactions	10. Related-Party Transactions For 2019 and 2018, the Company paid $3,979 and $4,545, respectively, pursuant to certain aircraft and engines leases with related parties and for other professional services. Southshore Leasing, LLC (Southshore Leasing), through its affiliates (the Southshore Affiliates, and, together with Southshore Leasing, Southshore), leased aircraft and engines to Air Wisconsin pursuant to various operating lease agreements from April 2010 through January 2020. In 2019, Air Wisconsin paid a total of approximately $3,739 to Southshore, consisting of approximately $1,878 for the leases of three aircraft, approximately $1,661 for the lease of additional engines to support the operations of Air Wisconsin’s aircraft fleet, and $200 for the purchase of two previously leased airframes. In 2018, Air Wisconsin paid a total of approximately $4,305 to Southshore, consisting of approximately $1,525 for the leases of two aircraft, and a total of approximately $2,780 for the lease of additional engines. Air Wisconsin also from time to time contracted for services to be performed on assets held by Southshore that are used in Air Wisconsin’s operations and received reimbursement from Southshore at the cost of such services. Because Air Wisconsin acted as an agent or an intermediary in facilitating such transactions, the amounts of any such transactions are not included in the amounts described above. Resource Holdings Associates (Resource Holdings) has provided AWAC and Air Wisconsin with financial advisory and management services pursuant to an agreement entered into in January 2012. AWAC has paid a recurring monthly fee of $20 in exchange for these financial advisory and management services since January 2012. AWAC paid a total of $240 to Resource Holdings in both 2019 and 2018.

Collective Bargaining Agreement

Collective Bargaining Agreements	12 Months Ended
	Dec. 31, 2019
Retirement Benefits [Abstract]
Collective Bargaining Agreements	11. Collective Bargaining Agreements The Company has five collective bargaining units. The Airline Pilots Association (ALPA) represents pilots. The Association of Flight Attendants-CWA AFL-CIO As of December 31, 2019, the Company is in negotiations with the unions that represent the flight attendants and mechanics. The Company is in mediated negotiations with AFA representing the flight attendants and the IAMAW representing the mechanics. The Company believes the resolution of its negotiations will not have a material impact on its financial position or operations. Amendable dates for each bargaining unit are: Bargaining Unit Amendable Date Pilots November 21, 2022 Dispatchers November 1, 2020 Mechanics October 7, 2015 Technical store clerks September 20, 2022 Flight attendants June 27, 2016

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	12. Earnings Per Share Calculations of net income per common share were as follows (in thousands, except per share data): Year Ended December 31, 2019 2018 Net (loss) Income $ (19,214 ) $ 181,313 Basic weighted average common shares outstanding 54,863 54,863 Add: Incremental shares for: Diluted effects of stock options — 559 Diluted weighted average common shares outstanding 54,863 55,422 Net (loss) income per common share Basic $ (.35 ) $ 3.30 Diluted $ (.35 ) $ 3.27 Basic (loss) income per common share is computed by dividing net (loss) income attributable the Company by the weighted average number of common shares outstanding during the period. The number of incremental shares from the assumed issuance of shares related to the 2015 Stock Option is calculated by applying the treasury stock method. In loss periods, these incremental shares are excluded from the calculation of diluted loss per share, as the inclusion of these items would have an anti-dilutive effect. Net income at December 31, 2018 was driven by the gain on the extinguishment of debt of $198,729, resulting from the troubled debt restructuring in December 2018.

Stock Options

Stock Options	12 Months Ended
	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Stock Options	13. Stock Options 2015 Stock Option In 2015, the Company issued a stock option to purchase 558,835 shares of the common stock of the Company at an exercise price of $0.21386 per share. The value of the option at the date of grant was $.07 per share based on a life of 7.0 years, a risk-free interest rate of 2.01% and expected volatility of 157.1%. This is the only remaining stock option as of December 31, 2019 and 2018. After July 9, 2019, the 2015 Stock Option became fully exercisable; prior to that date it could be exercised based on the occurrence of certain events. The 2015 Stock Option terminates on July 9, 2022 or upon the occurrence of certain corporate transactions.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2019
Supplemental Cash Flow Elements [Abstract]
Supplemental Cash Flow Information	14. Supplemental Cash Flow Information Cash payments for interest for the years ended December 31, 2019 and 2018, were $1,841 and $1,348, respectively. Cash payments for income taxes for the years ended December 31, 2019 and 2018 amounted to $39 and $42, respectively. Cash payments included in the measurement of lease liabilities related to operating leases amount to $29,502 for the year ended December 31, 2019. The Company had noncash additions to property and equipment of $7,210 included in accounts payable as of December 31, 2018. The Company also recorded a fair market value of $15,832 for 14 aircraft acquired in a non-cash

Intangible Assets

Intangible Assets	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	15. Intangible Assets Intangible assets at December 31, 2019 and 2018 consist of the following (in thousands): December 31, 2019 2018 Gross Carrying Amount Gross Carrying Amount Trade names and air carrier certificate 5,300 5,300 Total $ 5,300 $ 5,300

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	16. Subsequent Events The Company evaluated its December 31, 2019, financial statements for subsequent events through July 1, 2020, the date the financial statements were available to be issued. The following subsequent events are noted: See the subsequent events described in Note 2 regarding the impact of the COVID-19 See the subsequent event described in Note 6 regarding the March 30, 2020, deferral agreement of certain principal and interest. On January 17, 2020, the Company completed the acquisition from Southshore Aircraft Holdings, LLC and its affiliated entities of three CRJ-200 On May 22, 2020, the Company acquired eight CRJ-200

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America and include the accounts of Harbor Diversified, Inc. and subsidiaries (collectively, Harbor or the Company). The Company’s subsidiaries consist of its wholly owned subsidiaries, Harbor Therapeutics, Inc. (which is a non-operating
Description of Operations	Description of Operations The Company is comprised of principal lines of business focused on (1) providing air transportation (airline business), (2) acquiring aircraft rotable equipment for the purpose of leasing to Air Wisconsin and (3) providing flight equipment financing to Air Wisconsin. The airline business is operated entirely through Air Wisconsin, an independent regional air carrier that is engaged in the business of providing scheduled passenger service under capacity purchase agreements (CPA) with United Airlines, Inc. (United or UA), and American Airlines, Inc. (American or AA). See Note 3 to the financial statements for further information regarding the service agreements with these partner airlines. The CPA with AA ended in February 2018. As of December 31, 2019, Air Wisconsin operated as a United Express carrier primarily in Chicago (O’Hare) and Washington, D. C. (Dulles).
Segment Reporting	Segment Reporting Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing operating performance. In consideration of ASC 280, “ Segment Reporting As further discussed below, all of our operating revenue in 2019 and 2018 was derived from operations associated with our United or American CPAs. It is currently impractical to provide certain information on our revenue from our customers for our services and geographic information on our revenues and long-lived assets.
Contract and Other Revenues	Contract and Other Revenues In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update No. 2014-09, The major airline partners make provisional cash payments to the Company during each month of service based on monthly flight schedules and the provisional cash payments are reconciled based on actual completed flights after each month’s flight activity is completed. As a lessor, for our aircraft operated under our CPA, we have historically accounted for the non-lease non-lease Under the nonrefundable up-front up-front 340-40, up-front The Company recognizes revenue under its CPAs with United and American over time as the service is provided. For the year ended December 31, 2019, revenue from the CPA with United represented 100% of contract revenues. For the year ended December 31, 2018, contract revenues from the Company’s CPAs with United and American were 97.2% and 2.8%, respectively. United pays the Company a fixed rate for each departure and block hour (measured from takeoff to landing, including taxi time), and a fixed amount per aircraft each month, with additional incentives primarily based on flight completion, on-time For the year ended December 31, 2019 2018 Capacity purchase agreements revenue: flight operations $ 263,495 $ 123,375 Capacity purchase agreements revenue: aircraft lease — 117,177 Contract Revenues $ 263,495 $ 240,552 A portion of the Company’s compensation under the CPA is designed to reimburse the Company for certain aircraft ownership costs. For the year ended December 31, 2018, the consideration received for the use of the aircraft under the Company’s CPA is reflected as lease revenue, inasmuch as the agreements identify the “right of use” of a specific number of aircraft over a stated period of time. Under the application of ASC 840 for the year ended December 31, 2018, the Company is required to apply the allocation objective of the new revenue recognition standard (Topic 606) to the lease and non-lease The property associated with the aircraft lease had a cost of $45,896, accumulated depreciation of $5,851, and a net carrying value of $40,045 at December 31, 2018. The contingent variable revenue associated with the aircraft lease for the year ended December 31, 2018 was $57,252. The Company’s CPA with United includes weekly provisional cash payments based on a projected level of flying each month. The Company and United subsequently reconcile these payments to the actual completed flight activity on a monthly basis. Under the CPA with United, the Company is eligible to receive incentive compensation upon the achievement of certain performance criteria. The incentives are defined in the CPA and are measured and determined on a monthly basis. At the end of each month during the term of the CPA, the Company calculates the incentives achieved during that period and recognizes revenue attributable to the CPA accordingly, subject to the variable constraint guidance under Topic 606. Other revenues are immaterial and primarily consist of the sales of parts to other airlines. The transaction price for the sale of these parts generally occurs at fair market value.
Cash and Cash Equivalents	Cash and Cash Equivalents Investments and deposits with a maturity of three months or less when acquired and money market funds are considered cash and cash equivalents.
Restricted Cash	Restricted Cash Restricted cash represents amounts escrowed in an interest-bearing account relating to the Company’s letters of credit.
Spare Parts and Supplies	Spare Parts and Supplies Expendable parts are stated at average cost less an obsolescence allowance. The Company provides for an allowance for obsolescence after considering the useful life of the aircraft fleet, the estimated cost of expendable parts expected to be on hand at the end of the useful life and the estimated salvage value of the parts. This allowance is based on management estimates and are subject to change. Expendable parts are charged to expense when used. Expendable parts that are repairable are returned to inventory at the average cost of comparable parts, less a reserve for scrap. Supplies are stated at average cost.
Property and Equipment and Depreciation	Property and Equipment and Depreciation Property and equipment are stated at cost and depreciated over their useful lives to their estimated residual values using the straight-line method as follows: Assets Depreciable Life Current Residual Value Aircraft 7 years $ 50,000 Rotable parts 7 years 10 % Spare engines 7 years $ 25,000 Ground equipment up to 10 years 0 % Office equipment up to 10 years 0 % Leasehold improvements Shorter of asset or lease life 0 % Capitalized engine maintenance costs are amortized over their estimated useful life measured in remaining engine cycles to the next scheduled shop event. Depreciation expense in 2019 and 2018 was $23,578 and $20,363, respectively, and is included in depreciation, amortization, and obsolescence in the accompanying statements of operations.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company evaluates long-lived assets for potential impairment and records impairment losses on long-lived assets when events and circumstances indicate the assets might be impaired and the undiscounted cash flows estimated to be generated by those assets are less than their carrying amounts. Impairment losses are measured by comparing the fair value of the assets to their carrying amounts. In determining the need to record impairment charges, the Company is required to make certain estimates regarding such things as the current fair market value of the assets and future net cash flows to be generated by the assets. If there are subsequent changes to these estimates, or if actual results differ from these estimates, such changes could impact the financial statements in the future. Certain factors occurring in 2017 and 2018 resulted in an impairment triggering event that required the Company to evaluate the carrying value of its long-lived property and equipment assets. Such factors included, but were not limited to, the early termination of aircraft residual value guarantees; significantly increased costs to recruit and retain pilots; the termination of the CPA with American Airlines; transition costs associated with the flying agreement with UA; and significantly reduced revenue from UA to cover the Company’s aircraft ownership costs. After reviewing for impairment, the Company recorded an impairment charge during the year ended December 31, 2017. The Company has determined that no further impairment charges on property and equipment were needed for the years ended December 31, 2019 and 2018.
Intangible Assets	Intangible Assets Indefinite-lived intangible assets are not subject to amortization but are subject to an annual assessment for impairment by applying a fair value-based test. The trade names and the air carrier certificate have indefinite lives, therefore, there is no amortization.
Maintenance	Maintenance The Company operates its aircraft under a continuous inspection and maintenance program. The normal cost of recurring maintenance is expensed when incurred except for planned major maintenance activities for engines where the deferral method of accounting is applied.
Income Taxes	Income Taxes The Company utilizes the asset and liability method for accounting for income taxes. Under the asset and liability method, deferred tax assets and liabilities are determined based upon the estimated future tax effects of differences between the financial statement and tax basis of assets and liabilities, as measured by the current applicable tax rates. Deferred tax expense represents the result of changes in deferred tax assets and liabilities. As required by the uncertain tax position guidance, the Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more-likely-than-not more-likely-than-not The Company is subject to income taxes in the United States (U.S.) federal jurisdiction and various state jurisdictions. Tax regulations within each jurisdiction are subject to the interpretation of the related tax laws and regulations and require significant judgment to apply. The Company is no longer subject to U.S. federal income tax examinations for the years prior to 2015. With few exceptions, the Company is no longer subject to state, and local income tax examinations for the years prior to 2014. As of December 31, 2019, the Company had no outstanding tax examinations. The Company recognizes interest and penalties related to unrecognized tax benefits in income tax expense for all periods presented. The Company had accrued $121 and $252 for the payment of interest and penalties at December 31, 2019 and 2018, respectively.
Comprehensive Income	Comprehensive Income The Company does not have any components of comprehensive income and, as of December 31, 2019 and 2018, comprehensive income is equal to net income reported in the statements of operations.
Concentration of Credit Risk	Concentration of Credit Risk The Company at times has had cash in excess of the Federal Deposit Insurance Corporation (FDIC) insurance limit. As of December 31, 2019, there were no bank deposits that exceeded the FDIC insurance limits. Substantially all the Company’s revenues in 2019 and 2018 were derived from United (see Note 3).
Estimates	Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States 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 could differ from those estimates.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company’s financial instruments include cash and cash equivalents, restricted cash, accounts receivable, long-term investments, accounts payable, and long-term debt. The Company believes the carrying amounts of these financial instruments are a reasonable estimate of their fair value because of the short-term nature of such instruments, or in the case of long-term debt, because of interest rates available to the Company for similar obligations. Long-term investments are held-to-maturity debt securities and are reported at amortized cost. Fair value is defined as the price that would be received to sell an asset, or paid to transfer a liability, in an orderly transaction between market participants at the measurement date (that is, an exit price). Accounting Standards Codification (ASC) 820 establishes a three-tier fair value hierarchy, which prioritizes inputs used in fair value. The tiers are as follows: Level 1 - Quoted market prices in active markets for identical assets or liabilities. Level 2 - Inputs other than Level 1 inputs that are either directly or indirectly observable. Level 3 - Unobservable inputs developed using the Company’s estimates and assumptions, which reflect those that market participants would use. The determination of where an asset or liability falls in the hierarchy requires significant judgment. The Company evaluates its hierarchy disclosures annually and based on various factors, it is possible that an asset or liability may be classified differently from year to year. However, the Company expects that changes in classifications between different levels will be rare. The Company classifies money market funds and deposits as Level 1 and long-term investments as Level 2. There have been no transfers between Level 1 and Level 2 investments during 2019.
Recently Adopted Standards	Recently Adopted Standards: ASU 2014-09 In May 2014, the FASB issued Accounting Standards Update No. 2014-09, The Company recast certain prior period amounts to conform to the adoption of Topic 606, as shown in the tables below (in thousands): Balance Sheet Previously Reported Adjustment As Adjusted Assets Contract costs $ — $ 400 $ 400 Long-term contract costs — 1,268 1,268 Total Assets $ — $ 1,668 $ 1,668 Liabilities Contract liability $ — $ 3,725 $ 3,725 Long-term contract liability — 11,510 11,510 Total Liabilities $ — $ 15,235 $ 15,235 The $1,668 and the $15,235 adjustment to contract assets and contract liabilities, respectively, reflects the amount of capitalized up-front up-front up-front In December 2019 and 2018, the Company received payments of $5,539 and $4,999 from UA for services to be rendered in January 2020 and January 2019, respectively. The Company recast the December 31, 2018, amount of $4,999 from accounts payable to contract liabilities on the balance sheet. These customer deposits have been recorded as contract liabilities in the balance sheets as of December 31, 2019 and 2018, and recorded as revenue in January 2020 and 2019, respectively. The statement of operations was recast as follows for the year ended December 31, 2018 (in thousands): For the Year Ended Previously Adjustments As Operating Revenues Contract revenues $ 243,272 $ (2,720 ) $ 240,552 Operating Expenses Aircraft maintenance repair 51,879 3,239 55,118 Amortization expense 21,745 400 22,145 Loss from Operations (18,139 ) (6,359 ) (24,498 ) Income Tax (Benefit) (4,297 ) (827 ) (5,124 ) Net Income $ 186,845 $ (5,532 ) $ 181,313 Explanations for each of the adjustments above are as follows: • Contract revenues – revenue of $6,200 was deferred as a contract liability and is partially offset by the amortization of the contract liability in the amount of $3,480. • Aircraft maintenance and repair – cost incurred in preparing the aircraft for service which were previously treated as a reimbursed expense. • Amortization expense – amortization of capitalized contract costs. • Income tax benefit – changes due to Topic 606 resulted in an increased loss from operations in the amount of $6,359. This resulted in an income tax benefit and additional deferred tax asset in the amount of $1,284, offset by the creation of a federal and state valuation allowance of $457 on deferred tax assets. Recently Adopted Standards: ASU 2016-02 In February 2016, the FASB issued ASU No. 2016-02, 2016-02 No. 2018-11, Additionally, the Company’s adoption of Topic 842 did not have a significant impact on the recognition, measurement or presentation of lease revenue and lease expenses within the financial statements of operations and statement of cash flows. The Company’s prepaid aircraft rents and accrued aircraft rents that were separately stated in the Company’s December 31, 2018 balance sheet have been classified as a component of the Company’s right-of-use As a result of the adoption of the new lease accounting guidance, the Company recognized the following ROU assets and lease liabilities as of January 1, 2019: Right-of-use $ 70,892 Lease liabilities – operating leases $ 40,921

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Schedule of Types of Contract Revenue	Contract revenues by type for the year ended December 31, 2019 and 2018 (in thousands) follows: For the year ended December 31, 2019 2018 Capacity purchase agreements revenue: flight operations $ 263,495 $ 123,375 Capacity purchase agreements revenue: aircraft lease — 117,177 Contract Revenues $ 263,495 $ 240,552
Schedule of Property and Equipment Useful lives	Property and equipment are stated at cost and depreciated over their useful lives to their estimated residual values using the straight-line method as follows: Assets Depreciable Life Current Residual Value Aircraft 7 years $ 50,000 Rotable parts 7 years 10 % Spare engines 7 years $ 25,000 Ground equipment up to 10 years 0 % Office equipment up to 10 years 0 % Leasehold improvements Shorter of asset or lease life 0 %
Schedule of Prior Period Adjustment Due to Adoption of New Accounting Policy	The Company recast certain prior period amounts to conform to the adoption of Topic 606, as shown in the tables below (in thousands): Balance Sheet Previously Reported Adjustment As Adjusted Assets Contract costs $ — $ 400 $ 400 Long-term contract costs — 1,268 1,268 Total Assets $ — $ 1,668 $ 1,668 Liabilities Contract liability $ — $ 3,725 $ 3,725 Long-term contract liability — 11,510 11,510 Total Liabilities $ — $ 15,235 $ 15,235 The statement of operations was recast as follows for the year ended December 31, 2018 (in thousands): For the Year Ended Previously Adjustments As Operating Revenues Contract revenues $ 243,272 $ (2,720 ) $ 240,552 Operating Expenses Aircraft maintenance repair 51,879 3,239 55,118 Amortization expense 21,745 400 22,145 Loss from Operations (18,139 ) (6,359 ) (24,498 ) Income Tax (Benefit) (4,297 ) (827 ) (5,124 ) Net Income $ 186,845 $ (5,532 ) $ 181,313
Right of Use (ROU) Assets and Lease Liabilities	As a result of the adoption of the new lease accounting guidance, the Company recognized the following ROU assets and lease liabilities as of January 1, 2019: Right-of-use $ 70,892 Lease liabilities – operating leases $ 40,921

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Schedule of Company's Aircrafts	The following presents the Company’s aircraft as of December 31, 2019 and 2018. December 31, 2019 Owned Leased CRJ-200 51 13 December 31, 2018 Owned Leased CRJ-200 37 26

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Summary of Income Tax Provision	The income tax provision consists of the following (the 2018 amounts have been recast in accordance with Note 1 above): Year ended December 31, 2019 2018 Current Benefit Federal $ (247 ) $ (753 ) State (174 ) (10 ) Total Current Benefit (421 ) (763 ) Deferred Expense (Benefit) Federal 789 (2,095 ) State (46 ) (2,266 ) Total Deferred Expense (Benefit) 743 (4,361 ) Income Tax Expense (Benefit) $ 322 $ (5,124 )
Schedule of Effective Income Tax Rate Reconciliation	The following is a reconciliation between a federal income tax rate of 21% in for the years ended December 31, 2019 and 2018 of income before income taxes and the effective tax rate which is derived by dividing the provision (benefit) for income taxes by the income before the provision for income taxes (in thousands): Year ended December 31, 2019 2018 Computed provision for income taxes at the statutory rate $ (3,964 ) $ 37,000 Increase (decrease) in income taxes resulting from: State income tax provision, net of federal income tax benefit (830 ) (2,880 ) Non-deductible 241 198 Gain on troubled debt restructuring — (44,981 ) Loss of tax attributes — 14,322 Valuation allowance changes affecting the provision for income taxes 5,873 (9,562 ) Return to provision adjustments (954 ) (125 ) Other, net (46 ) 904 Provision (benefit) for income taxes $ 322 $ (5,124 )
Components of Deferred Tax Assets and Liabilities	Significant components of deferred tax assets and liabilities are as follows: December 31, 2019 2018 Deferred Tax Assets Accruals and reserves not currently deductible $ 6,631 $ 7,084 Federal NOL and interest expense limitation carryovers 13,796 286 State NOL and interest expense limitation carryovers 1,106 39 Accrued and deferred compensation 2,888 2,809 Prepaid items 1,198 2,432 Lease liability 4,052 — Contract liability 2,543 3,242 Residual value guarantee settlement — 2,568 Other 1,010 849 Subtotal before valuation allowance 33,224 19,309 Less: valuation allowance (6,330 ) (457 ) Total Deferred Tax Assets 26,894 18,852 Deferred Tax Liabilities Property and equipment (24,696 ) (20,701 ) Right-of-use (4,791 ) — Other (6 ) (6 ) Total Deferred Tax Liabilities (29,493 ) (20,707 ) Net Deferred Income Tax Liabilities $ (2,599 ) $ (1,855 )
Schedule of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits for the years ended December 31, 2019 and 2018 is as follows (in thousands): December 31, 2019 2018 Unrecognized tax benefits at the beginning of the year $ 388 $ 278 Gross increases – current year tax positions — 128 Gross decreases – lapse of statute (140 ) (18 ) Unrecognized tax benefits at the end of the year $ 248 $ 388 Interest and penalties in year-end $ 121 $ 252

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2019
Debt Disclosure [Abstract]
Schedule of Long-term Debt	Long-term debt consists of the following (with interest rates as of December 31, 2019 and December 31, 2018): December 31, 2019 2018 Notes due December 31, 2025, 4.0% (a) $ 86,497 $ 86,497 Credit Agreements due through 2022, 5.0% (b) 34,186 29,595 Total debt 120,683 116,092 Less: current maturities 12,845 7,198 Long-Term Debt $ 107,838 $ 108,894 (a) On December 24, 2018, Air Wisconsin entered into a debt restructuring agreement with a lender (Lender), which held certain senior aircraft notes and subordinated aircraft notes. Under the agreement the senior aircraft notes were exchanged for Notes in the aggregate principal amount of $70,000 (Aircraft Notes) and the subordinated aircraft notes were cancelled. The Aircraft Notes bear interest at the rate of 4% per annum. Air Wisconsin concluded the restructuring should be classified as a troubled debt restructuring and, as such, future undiscounted interest payments of $16,497 were capitalized as part of the carrying value of the debt. (b) Air Wisconsin entered into a credit agreement with the Lender in June 2017 in the amount of $14,397, and a second credit agreement in January 2018 in the amount of $15,198, which was subsequently amended in December 2018 and again in June 2019 for additional funding of $5,755 and $6,034, respectively, and to extend the maturity date. The loans made by the Lender under these two credit agreements (Other Loans) have an interest rate of 5% and maturity dates of December 31, 2020 and June 30, 2022, respectively.
Schedule of Maturities of Long-Term Debt	Maturities of long-term debt for the years subsequent to December 31, 2019, are as follows: Fiscal Year Amount 2020 $ 12,845 2021 22,758 2022 23,410 2023 9,170 2024 8,890 Thereafter 43,610 Total $ 120,683

Lease Obligations (Tables)

Lease Obligations (Tables)	12 Months Ended
	Dec. 31, 2019
Leases [Abstract]
Summary of Operating Lease Related Terms and Discount Rates	The table below presents operating lease related terms and discount rates as of December 31, 2019: Weighted-average remaining lease term 4.04 years Weighted-average discount rate 7.02 %
Schedule of Component of Lease Cost	Components of lease costs were as follows for the year ended December 31, 2019: Operating lease cost $ 27,624 Short-term lease cost 4,331 Variable lease cost 182 Lease termination expense 19,353 Total lease cost $ 51,490
Schedule of Future Minimum Lease Payments Under Non-Cancelable Operating Leases	The following table summarizes the future minimum rental payments required under operating leases that had initial or remaining non-cancelable Fiscal Year Amount 2020 $ 7,384 2021 3,975 2022 3,906 2023 2,722 2024 1,087 Thereafter 987 Total lease payments 20,061 Less imputed interest (2,104 ) Total lease liabilities $ 17,957

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Schedule of Cash Obligations	The following table sets forth our cash obligations as of December 31, 2019: Payment Due for Year Ending December 31, (in thousands) Total 2020 2021 2022 2023 2024 Thereafter Aircraft Notes principal $ 70,000 $ — $ 7,000 $ 7,000 $ 7,000 $ 7,000 $ 42,000 Aircraft Notes interest $ 16,497 $ 5,647 $ 2,729 $ 2,451 $ 2,170 $ 1,890 $ 1,610 Other Loans principal $ 34,186 $ 7,198 $ 13,029 $ 13,959 $ — $ — $ — Other Loans interest $ 3,193 $ 1,664 $ 1,230 $ 299 $ — $ — $ — Operating lease obligations $ 20,061 $ 7,384 $ 3,975 $ 3,906 $ 2,722 $ 1,087 $ 987 Total $ 143,937 $ 21,893 $ 27,963 $ 27,615 $ 11,892 $ 9,977 $ 44,597

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2019
Earnings Per Share [Abstract]
Schedule of Calculations of Net Income Per Common Share	Calculations of net income per common share were as follows (in thousands, except per share data): Year Ended December 31, 2019 2018 Net (loss) Income $ (19,214 ) $ 181,313 Basic weighted average common shares outstanding 54,863 54,863 Add: Incremental shares for: Diluted effects of stock options — 559 Diluted weighted average common shares outstanding 54,863 55,422 Net (loss) income per common share Basic $ (.35 ) $ 3.30 Diluted $ (.35 ) $ 3.27

Intangible Assets (Tables)

Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	Intangible assets at December 31, 2019 and 2018 consist of the following (in thousands): December 31, 2019 2018 Gross Carrying Amount Gross Carrying Amount Trade names and air carrier certificate 5,300 5,300 Total $ 5,300 $ 5,300

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 01, 2018	Dec. 31, 2019	Dec. 31, 2018
Summary of Significant Accounting Policies [Line Items]
Adjustment retained earnings		$ (211,533)	$ (192,319)
Deferred tax asset contract liability		2,543	3,242
Valuation allowance		6,330	457
Flight equipment cost			45,896
Accumulated depreciation			5,851
Flight equipment cost, net			40,045
Contingent variable revenue			57,252
Depreciation expense		23,578	20,363
Accrued payment of interest and penalties		121	252
Amortization of contract liabilities		(3,725)	(3,480)
Deferred tax asset		26,894	18,852
Loss from Operations		(20,862)	$ (24,498)
Revenue from Contract with Customer, Product and Service Benchmark [Member]
Summary of Significant Accounting Policies [Line Items]
Contract Revenues Purchase Agreement, Percent			100.00%
Accounting Standards Update (ASU) 2014-09 [Member]
Summary of Significant Accounting Policies [Line Items]
Contract liability			$ 15,235
Contract assets			$ 1,668
United Airlines [Member] | Revenue from Contract with Customer, Product and Service Benchmark [Member]
Summary of Significant Accounting Policies [Line Items]
Contract Revenues Purchase Agreement, Percent			97.20%
United Airlines [Member] | Accounting Standards Update (ASU) 2014-09 [Member]
Summary of Significant Accounting Policies [Line Items]
Contract liability		5,539	$ 4,999
American Airlines [Member] | Revenue from Contract with Customer, Product and Service Benchmark [Member]
Summary of Significant Accounting Policies [Line Items]
Contract Revenues Purchase Agreement, Percent			2.80%
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
Summary of Significant Accounting Policies [Line Items]
Loss from Operations			$ (6,359)
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Accounting Standards Update (ASU) 2014-09 [Member]
Summary of Significant Accounting Policies [Line Items]
Adjustment retained earnings	$ 5,420
Deferred tax asset contract liability			1,788
Additional aircraft for service			9,439
Additional amortization expense			400
Upfront costs			3,480
Adjustments operating income			(6,359)
Valuation allowance			457
Contract liability	9,725		15,235
Upfront costs	$ 2,068
Amortization of contract liabilities		3,725	3,480
Upfront costs amortized		$ 400	400
Contract assets			1,668
Deferred contract liability			6,200
Deferred tax asset			1,284
Loss from Operations			$ 6,359

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Schedule of Types of Contract Revenue (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Operating revenues	$ 263,605	$ 240,610
Contract Revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenues	263,495	240,552
Contract Revenue [Member] | Flight Operations Member
Disaggregation of Revenue [Line Items]
Operating revenues	$ 263,495	123,375
Contract Revenue [Member] | Aircraft Lease [Member]
Disaggregation of Revenue [Line Items]
Operating revenues		$ 117,177

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Schedule of Property and Equipment Useful lives (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Aircraft [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Useful Life	7 years
Current Residual Value	$ 50,000
Rotable Parts [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Useful Life	7 years
Current Residual Value, percent	10.00%
Spare Engines [Member]
Property, Plant and Equipment [Line Items]
Property Plant And Equipment Useful Life	7 years
Current Residual Value	$ 25,000
Ground Equipment [Member]
Property, Plant and Equipment [Line Items]
Current Residual Value, percent	0.00%
Property Plant And Equipment Useful Life	Up to 10 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Current Residual Value, percent	0.00%
Property Plant And Equipment Useful Life	Up to 10 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Current Residual Value, percent	0.00%
Property Plant And Equipment Useful Life	Shorter of asset or lease life

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Schedule of Balance Sheet Prior Period Adjustment to the Adoption of Topic 606 (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract costs	$ 400	$ 400
Contract liability	$ 8,086	11,510
Accounting Standards Update (ASU) 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract costs		400
Long-term contract costs		1,268
Total Assets		1,668
Contract liability		3,725
Long-term contract liability		11,510
Total Liabilities		15,235
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Accounting Standards Update (ASU) 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract costs		400
Long-term contract costs		1,268
Total Assets		1,668
Contract liability		3,725
Long-term contract liability		11,510
Total Liabilities		$ 15,235	$ 9,725

Summary of Significant Accoun_8

Summary of Significant Accounting Policies - Schedule of Statement of Operations Prior Period Adjustment to the Adoption of Topic 606 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating revenues	$ 263,605	$ 240,610
Aircraft maintenance repair	57,827	55,118
Amortization expense	25,238	22,145
Loss from Operations	(20,862)	(24,498)
Income Tax (Benefit)	322	(5,124)
Net income	(19,214)	181,313
Contract Revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating revenues	$ 263,495	240,552
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Aircraft maintenance repair		51,879
Amortization expense		21,745
Loss from Operations		(18,139)
Income Tax (Benefit)		(4,297)
Net income		186,845
Previously Reported [Member] | Contract Revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating revenues		243,272
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Aircraft maintenance repair		3,239
Amortization expense		400
Loss from Operations		(6,359)
Income Tax (Benefit)		(827)
Net income		(5,532)
Revision of Prior Period, Change in Accounting Principle, Adjustment [Member] | Contract Revenue [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating revenues		$ (2,720)

Summary of Significant Accoun_9

Summary of Significant Accounting Policies - ROU assets and lease liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Operating Lease, Liability [Abstract]
Right-of-use assets - operating leases	$ 24,026	$ 70,892
Lease liabilities - operating leases	$ 17,957	$ 40,921

Liquidity and Management's Pl_2

Liquidity and Management's Plan, COVID-19 - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 13, 2020	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Apr. 20, 2020	Dec. 31, 2019
Liquidity Uncertainty And Going Concern [Line Items]
Interest payments deferred						$ 5,000
Small Business Administration Payroll Protection Program [Member] | Subsequent Event [Member]
Liquidity Uncertainty And Going Concern [Line Items]
Aggregate loan amount received	$ 10,000
Term Loan Maturity	2 years
Interest rate	1.00%
Treasury Department Payroll Support Program [Member] | Subsequent Event [Member]
Liquidity Uncertainty And Going Concern [Line Items]
Aggregate loan amount received					$ 20,499
Aggregate loan amount receivable					$ 41,000
Treasury Department Payroll Support Program [Member] | Forecast [Member]
Liquidity Uncertainty And Going Concern [Line Items]
Remaining amount to be paid three equal payment		$ 6,833	$ 6,833	$ 6,833

Service Agreements - Additional

Service Agreements - Additional Information (Detail)	Feb. 26, 2017Aircraft
United Airlines [Member] | CRJ-200 [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Number of Aircraft Operated	65

Property and Equipment - Summar

Property and Equipment - Summary of aircraft (Detail) - CRJ-200 [Member] - Aircraft	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Owned	51	37
Leased	13	26

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) $ in Thousands	Jul. 01, 2019USD ($)Aircraft	Dec. 31, 2019USD ($)Aircraft	Dec. 31, 2018USD ($)	Jan. 01, 2019USD ($)	Sep. 30, 2018USD ($)
Property, Plant and Equipment [Line Items]
Other income		$ 2,505	$ 14,396
Right-of-use assets		24,026		$ 70,892
Flight Property And Equipment [Member]
Property, Plant and Equipment [Line Items]
Fair market value		15,832
Aircraft lease termination costs		$ 19,353
Descrtption of aircraft engine cycle		On one hundred and forty dollars per remaining engine cycle with a minimum value of $50 per engine, and each of the aircraft airframes was assigned a fair market value of $100.
Right-of-use assets		$ 26,275
Offset by lease liabilities		1,182
Unamortized engine overhauls		$ 9,535
Number of engine acquired | Aircraft		28
Leasehold improvements book value		$ 738
Number of aircraft acquired | Aircraft		14
CRJ-200 [Member] | Bombardier Inc [Member]
Property, Plant and Equipment [Line Items]
Amount paid in installment					$ 25,192
Number of aircraft delivered | Aircraft	14
Remaining installment amount	$ 8,212
Other income		$ 2,537	$ 14,443

Income Taxes - Summary of incom

Income Taxes - Summary of income tax provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current Income Tax Expense (Benefit)
Federal	$ (247)	$ (753)
State	(174)	(10)
Total Current Benefit	(421)	(763)
Deferred Income Tax Expense (Benefit)
Federal	789	(2,095)
State	(46)	(2,266)
Total Deferred Expense (Benefit)	743	(4,361)
Income Tax Expense (Benefit)	$ 322	$ (5,124)

Income Tax - Additional Informa

Income Tax - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Effective Income Tax Rate, Federal statutory rate	21.00%	21.00%
Valuation allowance against certain deferred tax assets	$ 6,330	$ 457
Estimated effective tax rate, State	3.10%
Federal business interest carryforward	$ 4,724	1,360
Operating loss carryforward valuation allowance	6,330	457
Federal [Member]
Income Tax Disclosure [Line Items]
Net operating losses	60,940	0
State [Member]
Income Tax Disclosure [Line Items]
Net operating losses	$ 17,897	$ 509

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Effective income tax rate reconciliation
Computed provision for income taxes at the statutory rate	$ (3,964)	$ 37,000
State income tax provision, net of federal income tax benefit	(830)	(2,880)
Non-deductible expenses	241	198
Gain on troubled debt restructuring		(44,981)
Loss of tax attributes		14,322
Valuation allowance changes affecting the provision for income taxes	5,873	(9,562)
Return to provision adjustments	(954)	(125)
Other, net	(46)	904
Income Tax Expense (Benefit)	$ 322	$ (5,124)

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Assets
Accruals and reserves not currently deductible	$ 6,631	$ 7,084
Federal NOL and interest expense limitation carryovers	13,796	286
State NOL and interest expense limitation carryovers	1,106	39
Accrued and deferred compensation	2,888	2,809
Prepaid items	1,198	2,432
Lease liability	4,052
Contract liability	2,543	3,242
Residual value guarantee settlement		2,568
Other	1,010	849
Subtotal before valuation allowance	33,224	19,309
Less: valuation allowance	(6,330)	(457)
Total Deferred Tax Assets	26,894	18,852
Deferred Tax Liabilities
Property and equipment	(24,696)	(20,701)
Right-of-use asset	(4,791)
Other	(6)	(6)
Total Deferred Tax Liabilities	(29,493)	(20,707)
Net Deferred Income Tax Liabilities	$ (2,599)	$ (1,855)

Income Taxes - Schedule of unre

Income Taxes - Schedule of unrecognized tax benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Unrecognized tax benefits
Unrecognized tax benefits at the beginning of the year	$ 388	$ 278
Gross increases - current year tax positions		128
Gross decreases - lapse of statute	(140)	(18)
Unrecognized tax benefits at the end of the year	248	388
Interest and penalties in year-end balance	$ 121	$ 252

Debt - Schedule Of Long Term De

Debt - Schedule Of Long Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Total debt	$ 120,683	$ 116,092
Less: current maturities	12,845	7,198
Long-Term Debt	107,838	108,894
Notes Due December 31, 2025 [Member]
Total debt	86,497	86,497
Credit Agreements Due Through 2022 [Member]
Total debt	$ 34,186	$ 29,595

Debt - Schedule Of Long Term _2

Debt - Schedule Of Long Term Debt (Parenthetical) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018	Dec. 24, 2018	Jan. 25, 2018	Dec. 31, 2017	Jun. 05, 2017
Notes Due December 31, 2025 [Member]
Bear interest rate	4.00%		4.00%
Credit Agreements Due Through 2022 [Member]
Line of credit		$ 26,987,000
Bear interest rate	5.00%		5.00%			5.00%
Aircraft Notes [Member]
Aggregate principal amount	$ 70,000,000			$ 70,000,000
Bear interest rate				4.00%
Future undiscounted interest payments	$ 16,497,000			$ 16,497,000
Credit Agreement [Member] | Credit Agreements Due Through 2022 [Member]
Line of credit							$ 14,397,000
Line of credit, additional borrowing amount				$ 5,755,000
Line of credit, maturity date	Dec. 31, 2020
Second Credit Agreement [Member] | Credit Agreements Due Through 2022 [Member]
Line of credit					$ 15,198,000
Line of credit, additional borrowing amount		$ 6,034,000
Line of credit, maturity date	Jun. 30, 2022

Debt - Additional information (

Debt - Additional information (Detail) - USD ($)

Apr. 30, 2019

Dec. 24, 2018

Jun. 30, 2022

Mar. 31, 2022

Jun. 30, 2020

Mar. 31, 2020

Dec. 31, 2019

Dec. 31, 2018

Dec. 31, 2004

Jun. 30, 2019

Jan. 25, 2018

Dec. 31, 2017

Jun. 05, 2017

Jul. 31, 2003

Letter of Credit [Member]

Deferred payment

$ 1,118,000

$ 3,918,000

Senior Aircraft Notes [Member]

Troubled debt restructuring and recorded a gain

$ 198,611,000

Senior Aircraft Notes [Member] | First 15-months [Member]

Debt interest, base rate

1.50%

Senior Aircraft Notes [Member] | Following 18-months [Member]

Debt interest, base rate

2.50%

Senior Aircraft Notes [Member] | Thereafter [Member]

Debt interest, base rate

3.50%

Senior Aircraft Notes [Member] | Minimum [Member]

Interest rate

4.75%

Senior Aircraft Notes [Member] | Maximum [Member]

Interest rate

6.84%

Aircraft Notes [Member]

Interest rate

4.00%

Aggregate principal amount

$ 70,000,000

$ 70,000,000

Mandatory semi-annual amortization commencing on June 30, 2021

3,500,000

Future undiscounted interest payments

16,497,000

$ 16,497,000

Credit Agreements Due Through 2022 [Member]

Interest rate

5.00%

5.00%

5.00%

Line of credit

$ 26,987,000

Credit Agreements Due Through 2022 [Member] | Second Credit Agreement [Member]

Line of credit

$ 15,198,000

Line of credit, additional borrowing amount

$ 6,034,000

Line of credit, payment extended

$ 7,273,000

$ 7,925,000

Line of credit, maturity date

Jun. 30, 2022

Credit Agreements Due Through 2022 [Member] | Credit Agreement [Member]

Line of credit

$ 14,397,000

Line of credit, additional borrowing amount

$ 5,755,000

Line of credit, payment

$ 7,198,000

Line of credit, maturity date

Dec. 31, 2020

Credit Agreements Due Through 2022 [Member] | Forecast [Member] | Second Credit Agreement [Member]

Line of credit, payment

$ 3,963,000

$ 3,963,000

City of Milwaukee, Wisconsin variable rate Industrial Development Bonds [Member]

Aggregate principal amount

$ 4,275,000

Debt - Schedule of Maturities o

Debt - Schedule of Maturities of Long-term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Maturities of Long-term Debt [Abstract]
2020	$ 12,845
2021	22,758
2022	23,410
2023	9,170
2024	8,890
Thereafter	43,610
Total	$ 120,683	$ 116,092

Lease Obligations - Additional

Lease Obligations - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Leases [Abstract]
Operating lease right of use asset	$ 24,026		$ 70,892
Current portion of operating lease liability	6,311
Long-term operating lease liability	10,538
Cash payments included in the measurement of lease liabilities related to operating leases	29,502
Operating lease rent expense	$ 51,490	$ 42,468

Lease Obligations - Summary Of

Lease Obligations - Summary Of Weighted average Terms and Discount Rate For Operating Leases (Detail)	Dec. 31, 2019
Leases [Abstract]
Weighted-average remaining lease term	4 years 14 days
Weighted-average discount rate	7.02%

Lease Obligations - Schedule of

Lease Obligations - Schedule of Component Of Lease Cost (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Lease, Cost [Abstract]
Operating lease cost	$ 27,624
Short-term lease cost	4,331
Variable lease cost	182
Lease termination expense	19,353
Total lease cost	$ 51,490

Lease Obligations - Schedule _2

Lease Obligations - Schedule of Future Minimum Lease Payments Under Non-Cancelable Operating Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
2020	$ 7,384
2021	3,975
2022	3,906
2023	2,722
2024	1,087
Thereafter	987
Operating lease obligations, Total	20,061
Less imputed interest	(2,104)
Total lease liabilities	$ 17,957	$ 40,921

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)	Dec. 31, 2019USD ($)Letter_Of_Credit
Other Commitments [Line Items]
Number of outstanding letters of credit | Letter_Of_Credit	10
Variable rate notes	$ 0
Letter of Credit [Member]
Other Commitments [Line Items]
Outstanding letters of credit	$ 814,000

Commitments and Contingencies_2

Commitments and Contingencies - Cash Obligations (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	$ 120,683	$ 116,092
Long-term debt, due in 2020	12,845
Long-term debt, due in 2021	22,758
Long-term debt, due in 2022	23,410
Long-term debt, due in 2023	9,170
Long-term debt, due in 2024	8,890
Long-term debt, due Thereafter	43,610
Operating lease obligations, Total	20,061
Operating lease obligations, due in 2020	7,384
Operating lease obligations, due in 2021	3,975
Operating lease obligations, due in 2022	3,906
Operating lease obligations, due in 2023	2,722
Operating lease obligations, due in 2024	1,087
Operating lease obligations, due Thereafter	987
Total cash obligations	143,937
Total cash obligations, due in 2020	21,893
Total cash obligations, due in 2021	27,963
Total cash obligations, due in 2022	27,615
Total cash obligations, due in 2023	11,892
Total cash obligations, due in 2024	9,977
Total cash obligations, due Thereafter	44,597
Aircraft Notes principal [Member]
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	70,000
Long-term debt, due in 2021	7,000
Long-term debt, due in 2022	7,000
Long-term debt, due in 2023	7,000
Long-term debt, due in 2024	7,000
Long-term debt, due Thereafter	42,000
Aircraft Notes interest [Member]
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	16,497
Long-term debt, due in 2020	5,647
Long-term debt, due in 2021	2,729
Long-term debt, due in 2022	2,451
Long-term debt, due in 2023	2,170
Long-term debt, due in 2024	1,890
Long-term debt, due Thereafter	1,610
Other Loans principal [Member]
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	34,186
Long-term debt, due in 2020	7,198
Long-term debt, due in 2021	13,029
Long-term debt, due in 2022	13,959
Other Loans interest [Member]
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	3,193
Long-term debt, due in 2020	1,664
Long-term debt, due in 2021	1,230
Long-term debt, due in 2022	$ 299

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Total expense under defined contribution retirement plans	$ 4,467	$ 4,043

Related-Party Transactions - Ad

Related-Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Payments to related parties pursuant to certain aircraft and engines leases and for other professional services	$ 3,979	$ 4,545
Operating lease agreements term	April 2010 through January 2020
Air Wisconsin [Member]
Related Party Transaction [Line Items]
Payments to related parties pursuant to certain aircraft and engines leases and for other professional services	$ 3,739	4,305
AWAC Aviation Inc [Member] | Financial Advisory And Management Services [Member]
Related Party Transaction [Line Items]
Monthly recurring fee payable pursuant to service agreement	20
Payment For Management services fee	240	240
Aircraft [Member] | Air Wisconsin [Member]
Related Party Transaction [Line Items]
Payments to related parties pursuant to certain aircraft and engines leases and for other professional services	1,878	1,525
Engines To Support Aircraft Fleet [Member] | Air Wisconsin [Member]
Related Party Transaction [Line Items]
Payments to related parties pursuant to certain aircraft and engines leases and for other professional services	1,661	$ 2,780
Airframe [Member]
Related Party Transaction [Line Items]
Related party transaction purchases of previously leased airframes	$ 200

Earnings Per Share - Calculatio

Earnings Per Share - Calculations of Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share Reconciliation [Abstract]
Net (loss) Income	$ (19,214)	$ 181,313
Basic weighted average common shares outstanding	54,863	54,863
Add: Incremental shares for:
Diluted effects of stock options		559
Diluted weighted average common shares outstanding	54,863	55,422
Net (loss) income per common share
Basic	$ (0.35)	$ 3.30
Diluted	$ (0.35)	$ 3.27

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Earnings Per Share [Abstract]
Gain on the extinguishment of debt resulting from the troubled debt restructuring	$ 198,729

Stock Options - Additional Info

Stock Options - Additional Information (Detail) - 2015 Stock Option [Member] - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted		558,835
Stock option issued, exercise price		$ 0.21386
Value of the option at the date of grant	$ 0.07
Options granted, life	7 years
Options granted, risk free interest rate	2.01%
Options granted, expected volatility	157.10%

Supplemental Cash Flow Inform_2

Supplemental Cash Flow Information - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Cash payments for interest	$ 1,841	$ 1,348
Cash payments for income taxes	39	42
Cash payments included in the measurement of lease liabilities related to operating leases	29,502
Noncash additions to property and equipment included in accounts payable		$ 7,210
Fair market value aircraft acquired in a non-cash lease termination transaction	$ 15,832

Intangible Assets - Components

Intangible Assets - Components of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Trade names and air carrier certificate	$ 5,300	$ 5,300
Total	$ 5,300	$ 5,300

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) $ in Thousands	May 22, 2020USD ($)
Subsequent Event [Member]
Subsequent Event [Line Items]
Aggregate purchase price for aircraft acquired	$ 3,000