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INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Jun. 30, 2021
INTANGIBLE ASSETS |
Schedule of intangible assets with indefinite lives | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2021 |  | December 31, 2020
Qwest: | ​ | ​ | ​ | ​ | ​ | ​
FAA Certifications | ​ | $ | 724 | ​ | $ | 724
Goodwill | ​ |  | 13,416 | ​ |  | 13,416
ALGS: | ​ |  |  | ​ |  |
FAA Certifications | ​ |  | 710 | ​ |  | 710
Goodwill | ​ |  | 379 | ​ |  | 379
ACS: | ​ |  |  | ​ |  |
Trademarks | ​ |  | 600 | ​ |  | 600
FAA Certifications | ​ |  | 7,300 | ​ |  | 7,300
Goodwill | ​ |  | 63 | ​ |  | 63
ACT: | ​ |  | ​ | ​ | ​ | ​
Trademarks | ​ |  | 200 | ​ |  | 200
FAA Certificates | ​ |  | 796 | ​ |  | 796
Goodwill | ​ |  | 6,002 | ​ |  | 6,002
Total intangible assets with indefinite lives | ​ | $ | 30,190 | ​ | $ | 30,190
Schedule of intangible assets with definite lives | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Useful Life |  | ​ | ​ |  | ​ | ​
​ | ​ | In Years | ​ | June 30, 2021 | ​ | December 31, 2020
Qwest: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer relationships | ​ | 10 | ​ | $ | 7,600 | ​ | $ | 8,083
ALGS: | ​ |  | ​ |  | ​ | ​ |  | ​
Customer relationships | ​ | 10 | ​ |  | 80 | ​ |  | 90
ACS: | ​ |  | ​ |  |  | ​ |  | ​
Customer relationships | ​ | 10 | ​ |  | 1,558 | ​ |  | 1,663
ACT: | ​ |  | ​ |  | ​ | ​ |  | ​
Customer relationships | ​ | 10 | ​ |  | 7,741 | ​ |  | 8,198
Total intangible assets with definite lives | ​ | ​ | ​ | $ | 16,979 | ​ | $ | 18,034

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