| 1 | OMN | Sultan of Oman Air Force | Callsign: Majan, Designator OU recalled by IATA | OM | AVCODES |
| 2 | OMN | Sultan of Oman Air Force | IATA: OU, Callsign: Oscar Uniform, ICAO callsign changed to Majan | OM | AVCODES |
| 3 | OMN | Sultan of Oman Air Force | IATA: OU, Callsign: Majan, Designator OU recalled by IATA. ICAO callsign changed from Oscar Uniform | OM | AVCODES |
| 4 | OMNB | OMNIBUS INC | | | SCAC3 |
| 5 | OMNE | ORBIT MOVERS & ERECTORS INC | | | SCAC3 |
| 6 | OMNF | OMNI FREIGHT SYSTEMS L L C | | | SCAC4 |
| 7 | OMNG | OMNI LOGISTICS INC | | | SCAC4 |
| 8 | OMNI | OMNI EXPRESS INC | | | SCAC3 |
| 9 | OMNITECH | Omnitech Sp. z o. o | City: Gliwice | PL | TRAFFIC |
| 10 | OMNL | OMNITAINER LINE INC. | | | SCAC3 |
| 11 | OMNL | OMNITAINER LINE INC | | | SCAC4 |
| 12 | OMNP | OMNI TRANSPORT | | | SCAC4 |
| 13 | OMNQ | OMNI COURIER INC | | | SCAC4 |
| 14 | OMNS | OMNISERVE SHIPPING COMPANY LIMITED | | | SCAC3 |
| 15 | OMNT | OMNI TRANSPORT INC | | | SCAC3 |
| 16 | OMNU | AIR LIQUID ITALIA SERVICE SRL | | I | BIC |
| 17 | OMNU | OMNIATRANSIT S R L LOGISTICA LIQUID | | | SCAC4 |
| 18 | OMNW | OMNI TOOL LTD | | | SCAC4 |
| 19 | OMNX | OmniSource Corp. | added 7/2006 | | NAKINA |
| 20 | OMNX | OMNISOURCE CORP. | | | PWRC |
| 21 | OMNX | Omnisource (Steel Dynamics) | | | RSRV |
| 22 | OMNX | OMNISOURCE CORPORATION | | | SCAC4 |
| 23 | OMNX | OmniSource Corp. | | USA | TRAFFIC |
