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EQUITY-METHOD INVESTMENT - Narrative (Q1) (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2021
USD ($)
Mar. 31, 2024
USD ($)
investment
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
investment
Dec. 31, 2022
USD ($)
investment
Schedule of Equity Method Investments [Line Items]          
Number of equity method investments | investment   1   1 2
Gain from equity-method investment   $ 4 $ 22 $ 22 $ (45)
Volato 158, LLC          
Schedule of Equity Method Investments [Line Items]          
Equity method investment, ownership percentage 100.00% 3.125%   3.125% 3.125%
Asset contributed in exchange for membership interest $ 4,200        
Gain from equity-method investment   $ 4 $ 2 $ (3) $ 11