DEBT - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) extension_option aircraft	Dec. 31, 2024 USD ($) aircraft	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 299.4	$ 177.3	$ 476.6
Extinguishment of debt		$ 37.4
Cash collateralized percentage	100.00%	100.00%
Letters of credit outstanding	$ 22.8	$ 21.4
Secured Debt
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 299.4	$ 177.3
Secured Debt | Minimum
Debt Instrument [Line Items]
Aggregate borrowings, term	5 years	4 years
Secured Debt | Maximum
Debt Instrument [Line Items]
Aggregate borrowings, term	12 years	12 years
Secured Debt | Aircraft
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 255.5
Number of aircraft | aircraft	12
Secured Debt | Aircraft | E-175
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 126.2
Number of aircraft | aircraft		6
Secured Debt | Aircraft | Regional And General Aviation Aircraft
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 51.1
Secured Debt | General Aviation Aircraft
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 1.2
Secured Debt | Spare Engines
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 42.7
Secured Debt | Real Estate Debt
Debt Instrument [Line Items]
Proceeds from issuance of debt			52.0
Extension period	1 year
Number of extension term options | extension_option	2
Secured Debt | Equipment Debt
Debt Instrument [Line Items]
Proceeds from issuance of debt			$ 118.0
Interest payments			8.00%
Unsecured Debt | PSP Loan Term
Debt Instrument [Line Items]
Aggregate borrowings, term	10 years
Interest rates	2.00%