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COMMITMENT AND CONTINGENCIES (Q1) (Tables) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 | Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract] |  |
Schedule of Future Minimum Payments Under Purchase Agreements | Future minimum payments under the purchase agreements with Gulfstream Aerospace, LP at March 31, 2024, are as follows, in thousands:
| ​ | ​ | Gulfstream G280 Fleet
2024 | ​ | ​ | $18,500
2025 | ​ | ​ | 15,500
Total expected contractual payments | ​ | ​ | $34,000
| Future minimum payments under the purchase agreements with Gulfstream Aerospace, LP at December 31, 2023, are as follows, in thousands:
For the twelve months ended December 31, | ​ | ​ | Gulfstream G280 Fleet
2024 | ​ | ​ | $24,500
2025 | ​ | ​ | 15,500
Total expected contractual payments | ​ | ​ | $40,000

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- Definition Tabular disclosure of key provisions of an arrangement under which the entity has agreed to purchase goods or services over a period of time greater than one year or the normal operating cycle, if longer, including the item for which expenditures will be made, minimum quantities, milestones, time period and committed amount. + References No definition available. + Details
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