| 1 | OAT | Omni Air Transport, LLC | Callsign: Driller, ICAO Designator changed to DRL | USA | AVCODES |
| 2 | OATC | OLMSTEAD, ARCHIE TRUCK CO | | | SCAC3 |
| 3 | OATD | OATES, DAVID | | | SCAC3 |
| 4 | OATE | OATES BROS, INC | | | SCAC3 |
| 5 | OATE | OATES BROTHERS TRUCKING INC | | | SCAC4 |
| 6 | OATG | OLVERA TRUCKING | | | SCAC4 |
| 7 | OATI | OMEGA TRANSPORTATION INC | | | SCAC3 |
| 8 | OATJ | ORIENTAL AIR TRANSPORT SERVICE INC | | | SCAC4 |
| 9 | OATN | OCEAN AIR TRANSPORTATION INC | | | SCAC3 |
| 10 | OATP | OAT ENTERPRISES INC | | | SCAC3 |
| 11 | OATR | OCEANSIDE AUTO TRANS INC | | | SCAC3 |
