| 1 | KTC | Kyrgyz Trans Avia Ltd. Airline | IATA: 6K, Ceased operations. | KS | AVCODES |
| 2 | KTC | Kyrgyz Trans Avia | | | ICAO1 |
| 3 | KTCC | KAYCO TRUCKING CO INC | | | SCAC3 |
| 4 | KTCF | KELLEY TRUCKING COMPANY LLC | | | SCAC4 |
| 5 | KTCG | KENYA TRUCKING COMPANY LLC - KENATC | | | SCAC4 |
| 6 | KTCH | KITCHELL, JOAN | | | SCAC3 |
| 7 | KTCH | KITCHENS M R S INC | | | SCAC4 |
| 8 | KTCI | KTC INC | | | SCAC3 |
| 9 | KTCK | KTC INC | | | SCAC3 |
| 10 | KTCL | KONOIKE TRANSPORTATION CO. LTD. | | | SCAC3 |
| 11 | KTCL | KELLEY TRANSIT COMPANY | | | SCAC4 |
| 12 | KTCM | KENNTORR TRUCKING COMPANY LLC | | | SCAC4 |
| 13 | KTCO | KETCO TRUCKING CO INC | | | SCAC3 |
| 14 | KTCO | K T C T | | | SCAC4 |
| 15 | KTCP | KIMOLOS TANKER CORPORATION | | | SCAC4 |
| 16 | KTCQ | KENTON TRANSFER CO | | | SCAC3 |
| 17 | KTCQ | KIRBY TRANS CORP | | | SCAC4 |
| 18 | KTCR | K-T CONTRACT SERVICES INC | | | SCAC3 |
| 19 | KTCR | KTC | | | SCAC4 |
| 20 | KTCS | KITCHUCK & SON | | | SCAC3 |
| 21 | KTCS | K-T CONTRACT SERVICES | | | SCAC4 |
| 22 | KTCT | K T C TRANSPORT INC | | | SCAC3 |
| 23 | KTCT | KATCO TRANSPORT INC | | | SCAC4 |
| 24 | KTCU | AEROSOL GAS COMPANY, INC | | USA | BIC |
| 25 | KTCU | KUSKOKWIM TRANSPORTATION CO. | | | SCAC3 |
| 26 | KTCV | KITTU TRANSPORT INC | | | SCAC4 |
| 27 | KTCW | KNOWLES TRUCKING COMPANY INC | | | SCAC4 |
| 28 | KTCX | Klamath Gas Co. | added 7/1963; 7/1965-1/1975; eliminated 1/1980 | | NAKINA |
| 29 | KTCX | Klamath Gas Co. | added 7/63; 7/65-1/75; eliminated 1/80 | | NRHS |
| 30 | KTCX | KLAMATH GAS CO. | | | PWRC |
| 31 | KTCX | KLAMATH GAS CO | | | SCAC3 |
| 32 | KTCY | KEMP TRUCKING COMPANY INC | | | SCAC4 |
