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ORGANIZATION AND DESCRIPTION OF BUSINESS (Q1) (Details)
3 Months Ended
Mar. 31, 2024
passenger
$ / shares
Dec. 31, 2023
$ / shares
Dec. 01, 2023
$ / shares
Dec. 31, 2022
$ / shares
Dec. 31, 2021
$ / shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Common stock, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001 $ 0.0001
Optimal number of passengers in fractional program missions | passenger 4