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Minimum future annual lease rentals contracted to be received under existing operating leases of flight equipment (Details) link:presentationLink link:calculationLink link:definitionLink 40901 - Disclosure - ACCRUED EXPENSES (Details) link:presentationLink link:calculationLink link:definitionLink 41101 - Disclosure - EARNINGS PER SHARE (Details) link:presentationLink link:calculationLink link:definitionLink 41203 - Disclosure - BUSINESS SEGMENTS - Reconciles segment gross profit to net income (Details) link:presentationLink link:calculationLink link:definitionLink 41301 - Disclosure - COMMITMENTS AND CONTINGENCIES - Future minimum lease payments under non-cancelable operating leases (Details) link:presentationLink link:calculationLink link:definitionLink 41401 - Disclosure - BUSINESS COMBINATION - Purchase price allocation (Details) link:presentationLink link:calculationLink link:definitionLink 00090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 00300 - Statement - Condensed Consolidated Statements of Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 31403 - Disclosure - BUSINESS COMBINATION (Tables) link:presentationLink link:calculationLink link:definitionLink 40201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) link:presentationLink link:calculationLink link:definitionLink 40203 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) link:presentationLink link:calculationLink link:definitionLink 40301 - Disclosure - SIGNIFICANT RISKS AND UNCERTAINTIES (Details) link:presentationLink link:calculationLink link:definitionLink 40401 - Disclosure - REVENUE (Details) link:presentationLink link:calculationLink link:definitionLink 40402 - Disclosure - REVENUE - Disaggregation (Details) link:presentationLink link:calculationLink link:definitionLink 40601 - Disclosure - INTANGIBLE ASSETS (Details) link:presentationLink link:calculationLink link:definitionLink 40602 - Disclosure - INTANGIBLE ASSETS - Estimated useful lives (Details) link:presentationLink link:calculationLink link:definitionLink 40603 - Disclosure - INTANGIBLE ASSETS - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 41202 - Disclosure - BUSINESS SEGMENTS - Selected financial information for each segment (Details) link:presentationLink link:calculationLink link:definitionLink 41204 - Disclosure - BUSINESS SEGMENTS - Intersegment revenues (Details) link:presentationLink link:calculationLink link:definitionLink 41402 - Disclosure - BUSINESS COMBINATION - Intangible assets (Details) link:presentationLink link:calculationLink link:definitionLink 41403 - Disclosure - BUSINESS COMBINATION - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 41501 - Disclosure - STOCKHOLDERS' EQUITY - Common Stock (Details) link:presentationLink link:calculationLink link:definitionLink 41502 - Disclosure - STOCKHOLDERS' EQUITY - Earn-Out Shares and Unvested Founder Shares (Details) link:presentationLink link:calculationLink link:definitionLink 41503 - Disclosure - STOCKHOLDERS' EQUITY - 2020 Equity Incentive Plan (Details) link:presentationLink link:calculationLink link:definitionLink 41504 - Disclosure - STOCKHOLDERS' EQUITY - Restricted Stock Unit Activity (Details) link:presentationLink link:calculationLink link:definitionLink 00105 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - DESCRIPTION OF THE BUSINESS link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - SIGNIFICANT RISKS AND UNCERTAINTIES link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 10501 - Disclosure - INVENTORY link:presentationLink link:calculationLink link:definitionLink 10601 - Disclosure - INTANGIBLE ASSETS link:presentationLink link:calculationLink link:definitionLink 10701 - Disclosure - PROPERTY AND EQUIPMENT, NET link:presentationLink link:calculationLink link:definitionLink 10801 - Disclosure - LEASE RENTAL REVENUES AND AIRCRAFT AND ENGINES HELD FOR LEASE link:presentationLink link:calculationLink link:definitionLink 10901 - Disclosure - ACCRUED EXPENSES link:presentationLink link:calculationLink link:definitionLink 11001 - Disclosure - WARRANT LIABILITY link:presentationLink link:calculationLink link:definitionLink 11101 - Disclosure - EARNINGS PER SHARE link:presentationLink link:calculationLink link:definitionLink 11201 - Disclosure - BUSINESS SEGMENTS link:presentationLink link:calculationLink link:definitionLink 11301 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 11401 - Disclosure - BUSINESS COMBINATION link:presentationLink link:calculationLink link:definitionLink 11501 - Disclosure - STOCKHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 20202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 30403 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 30503 - Disclosure - INVENTORY (Tables) link:presentationLink link:calculationLink link:definitionLink 30603 - Disclosure - INTANGIBLE ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 30703 - Disclosure - PROPERTY AND EQUIPMENT (Tables) link:presentationLink link:calculationLink link:definitionLink 30803 - Disclosure - LEASE RENTAL REVENUES AND AIRCRAFT AND ENGINES HELD FOR LEASE (Tables) link:presentationLink link:calculationLink link:definitionLink 30903 - Disclosure - ACCRUED EXPENSES (Tables) link:presentationLink link:calculationLink link:definitionLink 31103 - Disclosure - EARNINGS PER SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 31203 - Disclosure - BUSINESS SEGMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 31303 - Disclosure - COMMITMENTS AND CONTINGENCIES (Tables) link:presentationLink link:calculationLink link:definitionLink 31503 - Disclosure - STOCKHOLDERS' EQUITY (Tables) link:presentationLink link:calculationLink link:definitionLink 40202 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revision of prior period financial statements (Details) link:presentationLink link:calculationLink link:definitionLink 41001 - Disclosure - WARRANT LIABILITY (Details) link:presentationLink link:calculationLink link:definitionLink 41201 - Disclosure - BUSINESS SEGMENTS (Details) link:presentationLink link:calculationLink link:definitionLink 41302 - Disclosure - COMMITMENTS AND CONTINGENCIES - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink