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DEPOSITS (Q1) (Tables) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 | Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Schedule of Deposits | Deposits consist of the following at March 31, 2024 and December 31, 2023, in thousands:
| ​ | ​ | March 31, 2024 | ​ | ​ | December 31, 2023
Deposits on aircraft | ​ | ​ | $46,450 | ​ | ​ | $40,300
Other deposits | ​ | ​ | 406 | ​ | ​ | 516
Total deposits | ​ | ​ | $46,856 | ​ | ​ | $40,816
Less current portion | ​ | ​ | (25,200) | ​ | ​ | (25,125)
Total deposits, non-current | ​ | ​ | $21,656 | ​ | ​ | $15,691
Below is a breakdown of the deposits on aircraft as of March 31, 2024 and December 31, 2023, in thousands:
| ​ | ​ | March 31, 2024 | ​ | ​ | December 31, 2023
Gulfstream aircraft deposits | ​ | ​ | $45,000 | ​ | ​ | $39,000
Honda aircraft deposits | ​ | ​ | 1,450 | ​ | ​ | 1,300
Total deposits on aircraft | ​ | ​ | 46,450 | ​ | ​ | $40,300
Less current portion | ​ | ​ | (25,200) | ​ | ​ | (25,050)
Total deposits on aircraft non-current | ​ | ​ | $21,250 | ​ | ​ | $15,250
| Deposits consist of the following at December 31, 2023 and 2022, in thousand:
| ​ | ​ | December 31, 2023 | ​ | ​ | December 31, 2022
Deposits on aircraft | ​ | ​ | $40,300 | ​ | ​ | $12,833
Other deposits | ​ | ​ | 516 | ​ | ​ | 123
Total deposits | ​ | ​ | $40,816 | ​ | ​ | $12,956
Less current portion | ​ | ​ | (25,125) | ​ | ​ | (833)
Total deposits, non-current | ​ | ​ | $15,691 | ​ | ​ | $12,123
Below is a breakdown of the deposits on aircraft as of December 31, 2023 and 2022, in thousand:
| ​ | ​ | December 31, 2023 | ​ | ​ | December 31, 2022
Gulfstream aircraft deposits | ​ | ​ | $39,000 | ​ | ​ | $12,000
Honda aircraft deposits | ​ | ​ | 1,300 | ​ | ​ | 833
Total deposits on aircraft | ​ | ​ | $40,300 | ​ | ​ | $12,833
Less current portion | ​ | ​ | $(25,050) | ​ | ​ | (833)
Total deposits on aircraft non-current | ​ | ​ | 15,250 | ​ | ​ | $12,000

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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. + References No definition available. + Details
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