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COMMITMENTS AND CONTINGENCIES - Aircraft Commitments by Fleet Type (Details) (Details) - Future aircraft purchase commitments	Sep. 30, 2023 aircraft
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	313
A220-300
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	68
A321-200neo
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	113
A330-900neo
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	16
A350-900
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	16
B-737-10
Future Purchase Commitments
Aircraft purchase commitments, minimum quantity required	100

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
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-Section 50
-Paragraph 4
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-4

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The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has not been recognized for financial reporting purposes.

+ References

No definition available.

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