0000001 - Document - COVER link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE OPERATIONS (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) link:presentationLink link:calculationLink link:definitionLink 9952157 - Disclosure - GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Revenue from Contract with Customer link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - EMPLOYEE BENEFIT PLANS link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - SHAREHOLDER'S EQUITY link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - LOSS PER SHARE link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - SPECIAL ITEMS link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - EMPLOYEE BENEFIT PLANS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - LOSS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - GENERAL AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - REVENUE - Passenger Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - REVENUE - Loyalty Program Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - REVENUE - Cargo and Other Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - REVENUE - Loyalty Program Liability Rollforward (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - FAIR VALUE MEASUREMENTS - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - FAIR VALUE MEASUREMENTS - Fair Value Of Financial Instruments On A Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - FAIR VALUE MEASUREMENTS - Activity And Maturities For Marketable Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - FAIR VALUE MEASUREMENTS - Fixed-Rate Debt And Estimated Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - DEBT - Debt Obligations (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - DEBT - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - DEBT - Debt Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - COMMITMENTS AND CONTINGENCIES - Aircraft-Related Commitments (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - COMMITMENTS AND CONTINGENCIES - Capacity Purchase Agreement (CPA) Commitments (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - SHAREHOLDER'S EQUITY - Common Stock Repurchase (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - SHAREHOLDER'S EQUITY - CARES Act Issuance (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - LOSS PER SHARE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - LOSS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - SPECIAL ITEMS (Details) link:presentationLink link:calculationLink link:definitionLink