0001001 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 1001002 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 1002003 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1003004 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 1004005 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 1005006 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 2101101 - Disclosure - COMPANY BACKGROUND link:presentationLink link:calculationLink link:definitionLink 2402401 - Disclosure - COMPANY BACKGROUND - Offerings (Details) link:presentationLink link:calculationLink link:definitionLink 2403402 - Disclosure - COMPANY BACKGROUND - Amazon Agreement (Details) link:presentationLink link:calculationLink link:definitionLink 2104102 - Disclosure - BASIS OF PRESENTATION link:presentationLink link:calculationLink link:definitionLink 2205201 - Disclosure - BASIS OF PRESENTATION (Policies) link:presentationLink link:calculationLink link:definitionLink 2106103 - Disclosure - IMPACT OF THE COVID-19 PANDEMIC link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - IMPACT OF THE COVID-19 PANDEMIC (Details) link:presentationLink link:calculationLink link:definitionLink 2108104 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 2309301 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 2410404 - Disclosure - REVENUE - Significant Categories of Operating Revenues (Details) link:presentationLink link:calculationLink link:definitionLink 2411405 - Disclosure - REVENUE - Operating Revenues by Geographic Region (Details) link:presentationLink link:calculationLink link:definitionLink 2412406 - Disclosure - REVENUE - Contract Balances (Details) link:presentationLink link:calculationLink link:definitionLink 2412406 - Disclosure - REVENUE - Contract Balances (Details) link:presentationLink link:calculationLink link:definitionLink 2413407 - Disclosure - REVENUE - Loyalty Program (Details) link:presentationLink link:calculationLink link:definitionLink 2114105 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 2315302 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 2416408 - Disclosure - EARNINGS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 2117106 - Disclosure - AIRCRAFT link:presentationLink link:calculationLink link:definitionLink 2318303 - Disclosure - AIRCRAFT (Tables) link:presentationLink link:calculationLink link:definitionLink 2419409 - Disclosure - AIRCRAFT - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2420410 - Disclosure - AIRCRAFT - Aircraft Fleet (Details) link:presentationLink link:calculationLink link:definitionLink 2421411 - Disclosure - AIRCRAFT - Depreciation, Amortization, and Rent Expense on Aircraft (Details) link:presentationLink link:calculationLink link:definitionLink 2422412 - Disclosure - AIRCRAFT - Aircraft Maintenance Deposits Contra-Assets and Over-market Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2123107 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 2324304 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 2425413 - Disclosure - DEBT - Lines of Credit (Details) link:presentationLink link:calculationLink link:definitionLink 2426414 - Disclosure - DEBT - Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2427415 - Disclosure - DEBT - Long-term Debt Schedule (Details) link:presentationLink link:calculationLink link:definitionLink 2428416 - Disclosure - DEBT - Future Maturities of the Outstanding Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2428416 - Disclosure - DEBT - Future Maturities of the Outstanding Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2429417 - Disclosure - DEBT - Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 2130108 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT link:presentationLink link:calculationLink link:definitionLink 2331305 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 2432418 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 2433419 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT - Changes in Derivative Assets (Liabilities) (Details) link:presentationLink link:calculationLink link:definitionLink 2434420 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT - Fuel Derivative Gains (Details) link:presentationLink link:calculationLink link:definitionLink 2135109 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 2436421 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 2137110 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 2438422 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 2139111 - Disclosure - SPECIAL ITEMS, NET link:presentationLink link:calculationLink link:definitionLink 2340306 - Disclosure - SPECIAL ITEMS, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 2441423 - Disclosure - SPECIAL ITEMS, NET - Schedule of Special Items, Net (Details) link:presentationLink link:calculationLink link:definitionLink 2142112 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 2443424 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 2144113 - Disclosure - OPERATING SEGMENTS link:presentationLink link:calculationLink link:definitionLink 2345307 - Disclosure - OPERATING SEGMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 2446425 - Disclosure - OPERATING SEGMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 2147114 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink