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COMMITMENT AND CONTINGENCIES (FY) (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
Summary of Future Estimated Minimum Lease Payments by Year and in Aggregate |  | Future estimated minimum lease payments by year and in aggregate, under the Company’s fixed payment operating lease consisted of the following at December 31, 2023, in thousand:
For the years ended December 31, | ​ | ​ | Operating Leases
2024 | ​ | ​ | $464
2025 | ​ | ​ | 471
2026 | ​ | ​ | 479
2027 | ​ | ​ | 161
TOTAL | ​ | ​ | 1,575
Less amount representing interest | ​ | ​ | (284)
Present value of net minimum payments (inc. $326 classified as current operating lease liability) | ​ | ​ | $1,291

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-6 + Details
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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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