0000001 - Document - COVER link:presentationLink link:calculationLink link:definitionLink 0000002 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 0000003 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 0000004 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000005 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 0000006 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) link:presentationLink link:calculationLink link:definitionLink 0000007 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 0000008 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 0000009 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 0000010 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) 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 - IMPACT OF THE COVID-19 PANDEMIC link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - AIRCRAFT 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 - FUEL DERIVATIVES AND RISK MANAGEMENT link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - INVESTMENTS link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 0000025 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 0000026 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 0000027 - Disclosure - SPECIAL ITEMS, NET link:presentationLink link:calculationLink link:definitionLink 0000028 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 0000029 - Disclosure - OPERATING SEGMENTS link:presentationLink link:calculationLink link:definitionLink 0000030 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS link:presentationLink link:calculationLink link:definitionLink 0000031 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 0000032 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 0000033 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 0000034 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 0000035 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 0000036 - Disclosure - AIRCRAFT (Tables) link:presentationLink link:calculationLink link:definitionLink 0000037 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000038 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 0000039 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 0000040 - Disclosure - STOCK-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 0000041 - Disclosure - DEFINED CONTRIBUTION 401(k) PLAN (Tables) link:presentationLink link:calculationLink link:definitionLink 0000042 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - INVESTMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - INCOME TAXES (Table) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - SPECIAL ITEMS, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - OPERATING SEGMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000049 - Disclosure - COMPANY BACKGROUND (Details) link:presentationLink link:calculationLink link:definitionLink 0000050 - Disclosure - COMPANY BACKGROUND - Equity Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 0000051 - Disclosure - COMPANY BACKGROUND- Stock split (Details) link:presentationLink link:calculationLink link:definitionLink 0000052 - Disclosure - COMPANY BACKGROUND - Initial Public Offering (Details) link:presentationLink link:calculationLink link:definitionLink 0000053 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) link:presentationLink link:calculationLink link:definitionLink 0000054 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 0000055 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 0000056 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) link:presentationLink link:calculationLink link:definitionLink 0000057 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 0000058 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Asset Impairment Analysis (Details) link:presentationLink link:calculationLink link:definitionLink 0000059 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 0000060 - 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 0000061 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 0000062 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revision of Previously Issued Consolidated Financial Statements (Details) link:presentationLink link:calculationLink link:definitionLink 0000063 - Disclosure - IMPACT OF THE COVID-19 PANDEMIC (Details) link:presentationLink link:calculationLink link:definitionLink 0000064 - Disclosure - REVENUE - Disaggregation of Operating Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 0000065 - Disclosure - REVENUE - Contract Balances (Details) link:presentationLink link:calculationLink link:definitionLink 0000066 - Disclosure - REVENUE - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000067 - Disclosure - REVENUE - Loyalty Program (Details) link:presentationLink link:calculationLink link:definitionLink 0000068 - Disclosure - EARNINGS PER SHARE - Computation of basic and diluted earnings (Details) link:presentationLink link:calculationLink link:definitionLink 0000069 - Disclosure - AIRCRAFT - Aircraft fleet (Details) link:presentationLink link:calculationLink link:definitionLink 0000070 - Disclosure - AIRCRAFT - Depreciation, Amortization, and Rent Expense on Aircraft (Details) link:presentationLink link:calculationLink link:definitionLink 0000071 - Disclosure - AIRCRAFT - Aircraft Maintenance Deposits Contra-Assets (Details) link:presentationLink link:calculationLink link:definitionLink 0000072 - Disclosure - AIRCRAFT - Over-market Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000073 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Components (Details) link:presentationLink link:calculationLink link:definitionLink 0000074 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000075 - Disclosure - DEBT - Credit Facilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000076 - Disclosure - DEBT - Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 0000077 - Disclosure - DEBT - Long-term Debt schedule (Details) link:presentationLink link:calculationLink link:definitionLink 0000078 - Disclosure - DEBT - Future maturities of the outstanding Debt (Details) link:presentationLink link:calculationLink link:definitionLink 0000079 - Disclosure - DEBT - Measured at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 0000080 - Disclosure - LEASES - Summary (Details) link:presentationLink link:calculationLink link:definitionLink 0000081 - Disclosure - LEASES - Lease-related assets and liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000082 - Disclosure - LEASES - Finance lease obligations (Details) link:presentationLink link:calculationLink link:definitionLink 0000083 - Disclosure - LEASES - Operating lease obligations (Details) link:presentationLink link:calculationLink link:definitionLink 0000084 - Disclosure - LEASES - Lease cost (Details) link:presentationLink link:calculationLink link:definitionLink 0000085 - Disclosure - LEASES - Supplemental cash flow information (Details) link:presentationLink link:calculationLink link:definitionLink 0000086 - Disclosure - LEASES - Terms and discount rates (Details) link:presentationLink link:calculationLink link:definitionLink 0000087 - Disclosure - LEASES - Additional disclosures (Details) link:presentationLink link:calculationLink link:definitionLink 0000088 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000089 - Disclosure - STOCK-BASED COMPENSATION - Stock option activity (Details) link:presentationLink link:calculationLink link:definitionLink 0000090 - Disclosure - STOCK-BASED COMPENSATION - Black-Scholes option pricing model (Details) link:presentationLink link:calculationLink link:definitionLink 0000091 - Disclosure - STOCK-BASED COMPENSATION - Restricted Stock Units (Details) link:presentationLink link:calculationLink link:definitionLink 0000092 - Disclosure - DEFINED CONTRIBUTION 401(k) PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 0000093 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000094 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT (Details) link:presentationLink link:calculationLink link:definitionLink 0000095 - Disclosure - INVESTMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 0000096 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 0000097 - Disclosure - INCOME TAXES - Components of Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 0000098 - Disclosure - INCOME TAXES - Tax Rate Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 0000099 - Disclosure - INCOME TAXES - Deferred taxes (Details) link:presentationLink link:calculationLink link:definitionLink 0000100 - Disclosure - INCOME TAXES - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 0000101 - Disclosure - STOCKHOLDERS' EQUITY (Details) link:presentationLink link:calculationLink link:definitionLink 0000102 - Disclosure - SPECIAL ITEMS, NET - Schedule of special items, net (Details) link:presentationLink link:calculationLink link:definitionLink 0000103 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 0000104 - Disclosure - OPERATING SEGMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 0000105 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS - Impact of Revision on Previously Issued Condensed Parent Company (Details) link:presentationLink link:calculationLink link:definitionLink 0000106 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS - Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 0000107 - Disclosure - PARENT COMPANY FINANCIAL STATEMENTS - Statements of Operations (Details) link:presentationLink link:calculationLink link:definitionLink