| 1 | OKT | Soko Aviation, S.L. | Callsign: Soko Air, | E | AVCODES |
| 2 | OKT | Soko Aviation | | | ICAO1 |
| 3 | OKT | OKLAHOMA KANSAS & TEXAS RAILROAD CO. | | | PWRC |
| 4 | OKTA | O K TRANSFER & STORAGE INC | | | SCAC3 |
| 5 | OKTB | O K TRANSFER & STORAGE CO | | | SCAC3 |
| 6 | OKTC | OAK KNOLL TRANSPORT INC | | | SCAC4 |
| 7 | OKTE | OLD K TRANSPORTATION INC | | | SCAC4 |
| 8 | OKTF | OK TRANSFER LLC | | | SCAC4 |
| 9 | OKTG | O K TRUCKING INC | | | SCAC4 |
| 10 | OKTH | OAKHURST TRANSPORTATION INC | | | SCAC3 |
| 11 | OKTI | O K TRANSFER & STORAGE CO INC | | | SCAC3 |
| 12 | OKTK | O K TRUCKING CO INC | | | SCAC3 |
| 13 | OKTL | OKLAHOMA TANK LINES | | | SCAC3 |
| 14 | OKTN | O K TRANSPORTATION INC | | | SCAC4 |
| 15 | OKTO | O K TRANSFER COMPANY | | | SCAC3 |
| 16 | OKTO | Outokumpu Stainless Oy | | FI | VKM |
| 17 | OKTQ | OK TRANSFER CO | | | SCAC3 |
| 18 | OKTQ | OKT INC | | | SCAC4 |
| 19 | OKTR | O K TRUCKING CO | | | SCAC3 |
| 20 | OKTT | OK TOURS | | | SCAC4 |
| 21 | OKTV | OK TO SHIP INC | | | SCAC4 |
