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INTANGIBLES (Q1) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |  |
INTANGIBLES | NOTE 4 – INTANGIBLES Finite-Lived Intangible Assets The following is a summary of finite-lived intangible assets as of March 31, 2024 and December 31, 2023, in thousands:
| ​ | ​ | March 31, 2024
| ​ | ​ | Cost | ​ | ​ | Accumulated Amortization | ​ | ​ | Net
Customer relationships | ​ | ​ | $301 | ​ | ​ | $(125) | ​ | ​ | $176
| ​ | ​ | $301 | ​ | ​ | $(125) | ​ | ​ | $176
| ​ | ​ | December 31, 2023
| ​ | ​ | Cost | ​ | ​ | Accumulated Amortization | ​ | ​ | Net
Customer relationships | ​ | ​ | $301 | ​ | ​ | $(110) | ​ | ​ | $191
| ​ | ​ | $301 | ​ | ​ | $(110) | ​ | ​ | $191
Intangible asset amortization expense was $15 thousand for the three months ended March 31, 2024, and 2023, respectively. As of March 31, 2024, future amortization expense is expected to be as follows, in thousands:
| ​ | ​ | Amount
2024 | ​ | ​ | $45
2025 | ​ | ​ | 60
2026 | ​ | ​ | 60
2027 | ​ | ​ | 11
| ​ | ​ | $176
Indefinite - Lived Intangible Assets The following table summarizes the balances as of March 31, 2024 and December 31, 2023, of the indefinite-lived intangible assets, in thousands:
| ​ | ​ | March 31, 2024 | ​ | ​ | December 31, 2023
Intangible asset - Part 135 certificate | ​ | ​ | $1,200 | ​ | ​ | $1,200
The FAA Part 135 certificate for a total amount of $1.2 million relates to the certificate acquired from the GCA acquisition. During the year ended December 31, 2023, the Company transferred its Fly Dreams LLC operations to GCA and sold its membership interest in Fly Dreams LLC, including Fly Dreams FAA Part 135 Certificate, with a carrying balance of $163 thousand, for a selling price of $550 thousand, which resulted in a gain in the amount of $387 thousand, which was reported in other income in the consolidated statement of operations for the year ended December 31, 2023. The Company did not recognize any impairment of the Part 135 certificates as of March 31, 2024 and December 31, 2023. | NOTE 6 – INTANGIBLES Finite-Lived Intangible Assets The following is a summary of finite-lived intangible assets as of December 31, 2023 and 2022, in thousand:
| ​ | ​ | December 31, 2023
| ​ | ​ | Cost | ​ | ​ | Accumulated Amortization | ​ | ​ | Net
Customer relationships | ​ | ​ | $301 | ​ | ​ | $(110) | ​ | ​ | $191
| ​ | ​ | $301 | ​ | ​ | $(110) | ​ | ​ | $191
| ​ | ​ | December 31, 2022
| ​ | ​ | Cost | ​ | ​ | Accumulated Amortization | ​ | ​ | Net
Customer relationships | ​ | ​ | $301 | ​ | ​ | $(49) | ​ | ​ | $252
| ​ | ​ | $301 | ​ | ​ | $(49) | ​ | ​ | $252
Intangible asset amortization expense was $61 thousand and $49 thousand for the year ended December 31, 2023 and 2022, respectively. As of December 31, 2023, future amortization expense is expected to be as follows, in thousand:
Fiscal years ending December 31, | ​ | ​ | Amount
2024 | ​ | ​ | $60
2025 | ​ | ​ | 60
2026 | ​ | ​ | 60
2027 | ​ | ​ | 11
| ​ | ​ | $191
Indefinite - Lived Intangible Assets The following table summarizes the balances as of December 31, 2023 and 2022, of the indefinite-lived intangible assets, in thousand:
| ​ | ​ | December 31, 2023 | ​ | ​ | December 31, 2022
Intangible asset – Part 135 certificate | ​ | ​ | $1,200 | ​ | ​ | $1,363
The FAA Part 135 certificate for a total amount of $1.2 million relates to the certificate acquired from the GCA acquisition. During the year ended December 31, 2023, the Company transferred its Fly Dreams LLC operations to GCA and sold its membership interest in Fly Dreams LLC, including Fly Dreams FAA Part 135 Certificate, with a carrying balance of $163 thousand, for a selling price of $550 thousand, which resulted in a gain in the amount of $387 thousand, which was reported in other income in the consolidated statement of operations for the year ended December 31, 2023. The Company did not recognize any impairment of the Part 135 certificates as of December 31, 2023, and 2022.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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