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CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 0000010 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - COMPANY BACKGROUND link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - AIRCRAFT link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - ASSET ACQUISITIONS link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - STOCK BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - DEFINED CONTRIBUTION 401(k) PLAN link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 0000025 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 0000026 - Disclosure - SPECIAL ITEMS, NET link:presentationLink link:calculationLink link:definitionLink 0000027 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 0000028 - 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Disclosure - OPERATING SEGMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954487 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9954488 - Disclosure - COMPANY BACKGROUND - Equity transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9954489 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) link:presentationLink link:calculationLink link:definitionLink 9954490 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted cash (Details) link:presentationLink link:calculationLink link:definitionLink 9954491 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9954492 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable (Details) link:presentationLink link:calculationLink link:definitionLink 9954493 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Lessor Maintenance Deposits (Details) link:presentationLink link:calculationLink link:definitionLink 9954494 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) link:presentationLink link:calculationLink link:definitionLink 9954495 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and equipment (Details) link:presentationLink link:calculationLink link:definitionLink 9954496 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Asset impairment analysis (Details) link:presentationLink link:calculationLink link:definitionLink 9954497 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and other intangible assets (Details) link:presentationLink link:calculationLink link:definitionLink 9954498 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Valuation of the tax receivable agreement ("TRA") liability (Details) link:presentationLink link:calculationLink link:definitionLink 9954499 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Aircraft Fuel (Details) link:presentationLink link:calculationLink link:definitionLink 9954500 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9954501 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risk (Details) link:presentationLink link:calculationLink link:definitionLink 9954502 - Disclosure - REVENUE - Disaggregation of operating revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9954503 - Disclosure - REVENUE - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9954504 - Disclosure - REVENUE - Contract balances (Details) link:presentationLink link:calculationLink link:definitionLink 9954505 - Disclosure - REVENUE - Loyalty program (Details) link:presentationLink link:calculationLink link:definitionLink 9954506 - Disclosure - EARNINGS PER SHARE - Computation of basic and diluted earnings (Details) link:presentationLink link:calculationLink link:definitionLink 9954507 - Disclosure - AIRCRAFT - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9954508 - Disclosure - AIRCRAFT - Aircraft fleet (Details) link:presentationLink link:calculationLink link:definitionLink 9954509 - Disclosure - AIRCRAFT - Depreciation, amortization, and rent expense on aircraft (Details) link:presentationLink link:calculationLink link:definitionLink 9954510 - Disclosure - ASSET ACQUISITIONS - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9954511 - Disclosure - ASSET ACQUISITIONS - Asset acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 9954512 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Components (Details) link:presentationLink link:calculationLink link:definitionLink 9954513 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9954514 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Finite-Lived Assets, Future Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9954515 - Disclosure - DEBT - Long-term debt (Details) link:presentationLink link:calculationLink link:definitionLink 9954516 - Disclosure - DEBT - Long-term debt schedule (Details) link:presentationLink link:calculationLink link:definitionLink 9954517 - Disclosure - DEBT - Future maturities of the outstanding debt (Details) link:presentationLink link:calculationLink link:definitionLink 9954518 - Disclosure - DEBT - Measured at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 9954519 - Disclosure - DEBT - Credit facilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954520 - Disclosure - LEASES - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9954521 - Disclosure - LEASES - Lease-related assets and liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9954522 - Disclosure - LEASES - Finance lease obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9954523 - Disclosure - LEASES - Operating lease obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9954524 - Disclosure - LEASES - Lease cost (Details) link:presentationLink link:calculationLink link:definitionLink 9954525 - Disclosure - LEASES - Supplemental cash flow information (Details) link:presentationLink link:calculationLink link:definitionLink 9954526 - Disclosure - LEASES - Terms and discount rates (Details) link:presentationLink link:calculationLink link:definitionLink 9954527 - Disclosure - STOCK-BASED COMPENSATION - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9954528 - Disclosure - STOCK-BASED COMPENSATION - Stock option activity (Details) link:presentationLink link:calculationLink link:definitionLink 9954529 - Disclosure - STOCK-BASED COMPENSATION - Restricted stock units (Details) link:presentationLink link:calculationLink link:definitionLink 9954530 - Disclosure - DEFINED CONTRIBUTION 401(k) PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 9954531 - Disclosure - INVESTMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 9954532 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 9954533 - Disclosure - INCOME TAXES - Components of income taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9954534 - Disclosure - INCOME TAXES - Tax rate reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9954535 - Disclosure - INCOME TAXES - Deferred taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9954536 - Disclosure - INCOME TAXES - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9954537 - Disclosure - STOCKHOLDERS' EQUITY - Initial Public Offering of Common Stock and Other Stock Sales (Details) link:presentationLink link:calculationLink link:definitionLink 9954538 - Disclosure - STOCKHOLDERS' EQUITY - Secondary Offerings (Details) link:presentationLink link:calculationLink link:definitionLink 9954539 - Disclosure - STOCKHOLDERS' EQUITY - Common Stock Repurchases (Details) link:presentationLink link:calculationLink link:definitionLink 9954540 - Disclosure - STOCKHOLDERS' EQUITY - Amazon Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 9954541 - Disclosure - SPECIAL ITEMS, NET - Schedule of special items, net (Details) link:presentationLink link:calculationLink link:definitionLink 9954542 - 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