21100400 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 21140401 - Disclosure - BUSINESS COMBINATION - (Details) link:presentationLink link:calculationLink link:definitionLink 21140801 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Components (Details) link:presentationLink link:calculationLink link:definitionLink 21140904 - Disclosure - DEBT - Future maturities of the outstanding Debt (Details) link:presentationLink link:calculationLink link:definitionLink 21140904 - Disclosure - DEBT - Future maturities of the outstanding Debt (Details) (Calc 2) link:presentationLink link:calculationLink link:definitionLink 21141002 - Disclosure - LEASES - Lease-related assets and liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 21141004 - Disclosure - LEASES - Finance lease obligations (Details) link:presentationLink link:calculationLink link:definitionLink 21141005 - Disclosure - LEASES - Operating lease obligations (Details) link:presentationLink link:calculationLink link:definitionLink 21141005 - Disclosure - LEASES - Operating lease obligations (Details) (Calc 2) link:presentationLink link:calculationLink link:definitionLink 21141006 - Disclosure - LEASES - Lease cost (Details) link:presentationLink link:calculationLink link:definitionLink 21141401 - Disclosure - INCOME TAXES - Components of Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 21141403 - Disclosure - INCOME TAXES - Deferred taxes (Details) link:presentationLink link:calculationLink link:definitionLink 21141501 - Disclosure - DEFINED CONTRIBUTION 401K (Details) link:presentationLink link:calculationLink link:definitionLink 2200100 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 2200200 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 2200400 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 2200405 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 2240704 - Disclosure - DEBT - Future maturities of the outstanding Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2240801 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT (Details) link:presentationLink link:calculationLink link:definitionLink 2241301 - Disclosure - OPERATING SEGMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 21100100 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 21100200 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 21100300 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 21140101 - Disclosure - COMPANY BACKGROUND (Details) link:presentationLink link:calculationLink link:definitionLink 21140201 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 21140202 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventory (Details) link:presentationLink link:calculationLink link:definitionLink 21140203 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 21140204 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Stockholders' Equity (Details) link:presentationLink link:calculationLink link:definitionLink 21140206 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details) link:presentationLink link:calculationLink link:definitionLink 21140207 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) link:presentationLink link:calculationLink link:definitionLink 21140208 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 21140209 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Recently Adopted Accounting Standards (Details) link:presentationLink link:calculationLink link:definitionLink 21140301 - Disclosure - IMPACT OF THE COVID19 PANDEMIC (Details) link:presentationLink link:calculationLink link:definitionLink 21140302 - Disclosure - IMPACT OF THE COVID19 PANDEMIC - CARES Act (Details) link:presentationLink link:calculationLink link:definitionLink 21140303 - Disclosure - IMPACT OF THE COVID19 PANDEMIC - CARES Employee Retention Credit (Details) link:presentationLink link:calculationLink link:definitionLink 21140304 - Disclosure - IMPACT OF THE COVID19 PANDEMIC - CARES Act Loan Program (Details) link:presentationLink link:calculationLink link:definitionLink 21140305 - Disclosure - IMPACT OF THE COVID19 PANDEMIC - United States Department of the Treasury (Details) link:presentationLink link:calculationLink link:definitionLink 21140501 - Disclosure - REVENUE - Disaggregation of Operating Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 21140502 - Disclosure - REVENUE - Contract Balances (Details) link:presentationLink link:calculationLink link:definitionLink 21140503 - Disclosure - REVENUE (Details) link:presentationLink link:calculationLink link:definitionLink 21140503 - Disclosure - REVENUE Default (Details) link:presentationLink link:calculationLink link:definitionLink 21140504 - Disclosure - REVENUE - Loyalty Program (Details) link:presentationLink link:calculationLink link:definitionLink 21140602 - Disclosure - EARNINGS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 21140701 - Disclosure - PROPERTY & EQUIPMENT - Aircraft fleet (Details) link:presentationLink link:calculationLink link:definitionLink 21140901 - Disclosure - DEBT - Lines of Credit (Details) link:presentationLink link:calculationLink link:definitionLink 21140902 - Disclosure - DEBT - Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 21140903 - Disclosure - DEBT - Long-term Debt schedule (Details) link:presentationLink link:calculationLink link:definitionLink 21141001 - Disclosure - LEASES - Summary (Details) link:presentationLink link:calculationLink link:definitionLink 21141003 - Disclosure - LEASES - Rent payment deferrals (Details) link:presentationLink link:calculationLink link:definitionLink 21141009 - Disclosure - LEASES - Additional disclosures (Details) link:presentationLink link:calculationLink link:definitionLink 21141101 - Disclosure - STOCK-BASED COMPENSATION (Details) link:presentationLink link:calculationLink link:definitionLink 21141102 - Disclosure - STOCK-BASED COMPENSATION - Stock option activity (Details) link:presentationLink link:calculationLink link:definitionLink 21141201 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT (Details) link:presentationLink link:calculationLink link:definitionLink 21141301 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 21141801 - Disclosure - OPERATING SEGMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 21141901 - Disclosure - CONDENSED PARENT COMPANY FINANCIAL INFORMATION - Condensed Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 21141902 - Disclosure - CONDENSED PARENT COMPANY FINANCIAL INFORMATION - Condensed Statements of Operations (Details) link:presentationLink link:calculationLink link:definitionLink 21141903 - Disclosure - CONDENSED PARENT COMPANY FINANCIAL INFORMATION - Condensed Statements of Cash Flows (Details) link:presentationLink link:calculationLink link:definitionLink 21142001 - Disclosure - SUBSEQUENT EVENTS (Details) link:presentationLink link:calculationLink link:definitionLink 2200300 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 2240102 - Disclosure - COMPANY BACKGROUND - Initial Public Offering (Details) link:presentationLink link:calculationLink link:definitionLink 2240103 - Disclosure - COMPANY BACKGROUND (Details) link:presentationLink link:calculationLink link:definitionLink 2240301 - Disclosure - IMPACT OF THE COVID19 PANDEMIC (Details) link:presentationLink link:calculationLink link:definitionLink 2240401 - Disclosure - REVENUE - Disaggregation of Operating Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2240402 - Disclosure - REVENUE - Contract Balances (Details) link:presentationLink link:calculationLink link:definitionLink 2240403 - Disclosure - REVENUE (Details) link:presentationLink link:calculationLink link:definitionLink 2240403 - Disclosure - REVENUE Default (Details) link:presentationLink link:calculationLink link:definitionLink 2240404 - Disclosure - Revenue - Loyalty Program (Details) link:presentationLink link:calculationLink link:definitionLink 2240502 - Disclosure - EARNINGS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 2240601 - Disclosure - AIRCRAFT - Aircraft fleet (Details) link:presentationLink link:calculationLink link:definitionLink 2240602 - Disclosure - AIRCRAFT - Aircraft Lease Payment Deferrals (Details) link:presentationLink link:calculationLink link:definitionLink 2240603 - Disclosure - AIRCRAFT - Aircraft Maintenance Deposits Contra-Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2240701 - Disclosure - DEBT - Lines of Credit (Details) link:presentationLink link:calculationLink link:definitionLink 2240702 - Disclosure - DEBT - Long-term Debt (Details) link:presentationLink link:calculationLink link:definitionLink 2240703 - Disclosure - DEBT - Long-term Debt schedule (Details) link:presentationLink link:calculationLink link:definitionLink 2240901 - Disclosure - FAIR VALUE MEASUREMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 2241001 - Disclosure - INCOME TAXES (Details) link:presentationLink link:calculationLink link:definitionLink 2241102 - Disclosure - SPECIAL ITEMS, NET (Details) link:presentationLink link:calculationLink link:definitionLink 100090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 21100105 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 21100405 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 21110101 - Disclosure - COMPANY BACKGROUND link:presentationLink link:calculationLink link:definitionLink 21110201 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 21110301 - Disclosure - IMPACT OF THE COVID19 PANDEMIC link:presentationLink link:calculationLink link:definitionLink 21110401 - Disclosure - BUSINESS COMBINATION link:presentationLink link:calculationLink link:definitionLink 21110501 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 21110601 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 21110701 - Disclosure - PROPERTY & EQUIPMENT link:presentationLink link:calculationLink link:definitionLink 21110801 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS link:presentationLink link:calculationLink link:definitionLink 21110901 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 21111001 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 21111101 - Disclosure - STOCK BASED COMPENSATION link:presentationLink link:calculationLink link:definitionLink 21111201 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT link:presentationLink link:calculationLink link:definitionLink 21111301 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 21111401 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 21111501 - Disclosure - DEFINED CONTRIBUTION 401K link:presentationLink link:calculationLink link:definitionLink 21111601 - Disclosure - SPECIAL ITEMS, NET link:presentationLink link:calculationLink link:definitionLink 21111701 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 21111801 - Disclosure - OPERATING SEGMENTS link:presentationLink link:calculationLink link:definitionLink 21111901 - Disclosure - CONDENSED PARENT COMPANY FINANCIAL INFORMATION link:presentationLink link:calculationLink link:definitionLink 21112001 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 21112101 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 21120202 - Disclosure - BASIS OF PRESENTATION (Policies) link:presentationLink link:calculationLink link:definitionLink 21130203 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) link:presentationLink link:calculationLink link:definitionLink 21130403 - Disclosure - BUSINESS COMBINATION (Tables) link:presentationLink link:calculationLink link:definitionLink 21130503 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 21130603 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 21130703 - Disclosure - PROPERTY & EQUIPMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 21130803 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 21130903 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 21131003 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 21131103 - Disclosure - STOCK-BASED COMPENSATION (Tables) link:presentationLink link:calculationLink link:definitionLink 21131203 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 21131303 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 21131403 - Disclosure - INCOME TAXES (Table) link:presentationLink link:calculationLink link:definitionLink 21131503 - Disclosure - DEFINED CONTRIBUTION 401K (Tables) link:presentationLink link:calculationLink link:definitionLink 21131603 - Disclosure - SPECIAL ITEMS, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 21131803 - Disclosure - OPERATING SEGMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 21131903 - Disclosure - CONDENSED PARENT COMPANY FINANCIAL INFORMATION (Tables) link:presentationLink link:calculationLink link:definitionLink 21132103 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) link:presentationLink link:calculationLink link:definitionLink 21140205 - Disclosure - BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred Offering Costs (Details) link:presentationLink link:calculationLink link:definitionLink 21140601 - Disclosure - EARNINGS PER SHARE - Computation of basic and diluted earnings (Details) link:presentationLink link:calculationLink link:definitionLink 21140802 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 21140905 - Disclosure - DEBT - Measured at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 21141007 - Disclosure - LEASES - Supplemental cash flow information (Details) link:presentationLink link:calculationLink link:definitionLink 21141008 - Disclosure - LEASES - Terms and discount rates (Details) link:presentationLink link:calculationLink link:definitionLink 21141103 - Disclosure - STOCK-BASED COMPENSATION - Stock options valuation assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 21141402 - Disclosure - INCOME TAXES - Tax Rate Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 21141404 - Disclosure - INCOME TAXES - Paragraphs (Details) link:presentationLink link:calculationLink link:definitionLink 21141601 - Disclosure - SPECIAL ITEMS, NET - Schedule of special items, net (Details) link:presentationLink link:calculationLink link:definitionLink 21142101 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) link:presentationLink link:calculationLink link:definitionLink 2200105 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 2210101 - Disclosure - COMPANY BACKGROUND link:presentationLink link:calculationLink link:definitionLink 2210201 - Disclosure - BASIS OF PRESENTATION link:presentationLink link:calculationLink link:definitionLink 2210301 - Disclosure - IMPACT OF THE COVID19 PANDEMIC link:presentationLink link:calculationLink link:definitionLink 2210401 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 2210501 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 2210601 - Disclosure - AIRCRAFT link:presentationLink link:calculationLink link:definitionLink 2210701 - Disclosure - DEBT link:presentationLink link:calculationLink link:definitionLink 2210801 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT link:presentationLink link:calculationLink link:definitionLink 2210901 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 2211001 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 2211101 - Disclosure - SPECIAL ITEMS, NET link:presentationLink link:calculationLink link:definitionLink 2211201 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 2211301 - Disclosure - OPERATING SEGMENTS link:presentationLink link:calculationLink link:definitionLink 2211401 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 2220202 - Disclosure - BASIS OF PRESENTATION (Policies) link:presentationLink link:calculationLink link:definitionLink 2230403 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 2230503 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 2230603 - Disclosure - AIRCRAFT (Tables) link:presentationLink link:calculationLink link:definitionLink 2230703 - Disclosure - DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 2230803 - Disclosure - FUEL DERIVATIVES AND RISK MANAGEMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 2230903 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 2231103 - Disclosure - SPECIAL ITEMS, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 2231303 - Disclosure - OPERATING SEGMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 2240101 - Disclosure - COMPANY BACKGROUND- Stock split (Details) link:presentationLink link:calculationLink link:definitionLink 2240201 - Disclosure - BASIS OF PRESENTATION (Details) link:presentationLink link:calculationLink link:definitionLink 2240501 - Disclosure - EARNINGS PER SHARE - Computation of basic and diluted earnings (Details) link:presentationLink link:calculationLink link:definitionLink 2240705 - Disclosure - DEBT - Measured at fair value (Details) link:presentationLink link:calculationLink link:definitionLink 2241101 - Disclosure - SPECIAL ITEMS, NET - Schedule of special items, net (Details) link:presentationLink link:calculationLink link:definitionLink