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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Principles of Consolidation (FY) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 11, 2022
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Business Acquisition [Line Items]          
Cash consideration paid to acquire business       $ 0 $ 1,850
Gain from sale of consolidated entity   $ 0 $ 387 387 $ 0
Gulf Coast Aviation, Inc.          
Business Acquisition [Line Items]          
Cash consideration paid to acquire business $ 1,850        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fly Dreams, LLC          
Business Acquisition [Line Items]          
Selling price     550 550  
Gain from sale of consolidated entity     $ 387 $ 387