0000001 - Document - COVER link:presentationLink link:calculationLink link:definitionLink 0000002 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 9952158 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - COMPANY BACKGROUND link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - MERGER AGREEMENT WITH ALLEGIANT link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - AIRCRAFT link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - STOCK BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - DEFINED CONTRIBUTION 401(k) PLAN link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 9952173 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 9952174 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 9952175 - Disclosure - OPERATING SEGMENTS link:presentationLink link:calculationLink link:definitionLink 9952176 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS link:presentationLink link:calculationLink link:definitionLink 9952177 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 9952178 - Disclosure - SPECIAL ITEMS link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - AIRCRAFT (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - STOCK-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - DEFINED CONTRIBUTION 401(k) PLAN (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - INVESTMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - INCOME TAXES (Table) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - OPERATING SEGMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted cash (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts receivable (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and equipment (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Maintenance Rights Asset (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Asset impairment analysis (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and other intangible assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - 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 9955536 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings per Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration risk (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - MERGER AGREEMENT WITH ALLEGIANT (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - REVENUE - Disaggregation of operating revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - REVENUE - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - REVENUE - Contract balances (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - REVENUE - Loyalty program (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - EARNINGS PER SHARE - Computation of basic and diluted earnings (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - EARNINGS PER SHARE - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - AIRCRAFT - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - AIRCRAFT - Aircraft fleet (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - AIRCRAFT - Depreciation, amortization, and rent expense on aircraft (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Components (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Finite-Lived Assets, Future Amortization Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - DEBT - Credit facilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - DEBT - Long-term debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - DEBT - Long-term debt schedule (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - DEBT - Future maturities of the outstanding debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - DEBT - Measured at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - LEASES - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - LEASES - Lease-related assets and liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - LEASES - Finance lease obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - LEASES - Operating lease obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - LEASES - Lease cost (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - LEASES - Supplemental cash flow information (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - LEASES - Terms and discount rates (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - STOCK-BASED COMPENSATION - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - STOCK-BASED COMPENSATION - Stock option activity (Details) link:presentationLink link:calculationLink link:definitionLink 9955565 - Disclosure - STOCK-BASED COMPENSATION - Restricted stock units (Details) link:presentationLink link:calculationLink link:definitionLink 9955566 - Disclosure - DEFINED CONTRIBUTION 401(k) PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 9955567 - Disclosure - INVESTMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 9955568 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 9955569 - Disclosure - INCOME TAXES - Components of income taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955570 - Disclosure - INCOME TAXES - Tax rate reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 9955571 - Disclosure - INCOME TAXES - Deferred taxes (Details) link:presentationLink link:calculationLink link:definitionLink 9955572 - Disclosure - INCOME TAXES - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 9955573 - Disclosure - STOCKHOLDERS' EQUITY - Common Stock Repurchases (Details) link:presentationLink link:calculationLink link:definitionLink 9955574 - Disclosure - STOCKHOLDERS' EQUITY - Amazon Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 9955575 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 9955576 - Disclosure - OPERATING SEGMENTS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955577 - Disclosure - OPERATING SEGMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 9955578 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 9955579 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS - Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 9955580 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS - Statements of Operations (Details) link:presentationLink link:calculationLink link:definitionLink 9955581 - Disclosure - SPECIAL ITEMS (Details) link:presentationLink link:calculationLink link:definitionLink