| 1 | OMR | Minair | Callsign: Ormine, | RCA | AVCODES |
| 2 | OMR | Minair | | | ICAO1 |
| 3 | OMRL | OCEANIC MARINE LTD. | | | SCAC3 |
| 4 | OMRP | OMR PIPELINE COMPANY | | | SCAC3 |
| 5 | OMRT | OMAR TRUCKING INC | | | SCAC3 |
| 6 | OMRU | 1MROBOTICS LTD | | IL | BIC |
| 7 | OMRV | OLE MAN RIVER TOWING INC | | | SCAC3 |
| 8 | OMRX | Ozark Mountain Railcar LLC | 7/2005 (not listed) | | NAKINA |
| 9 | OMRX | Mather Stock Car Co. | 1/1941 | | NAKINA |
| 10 | OMRX | Oscar Mayer & Co. | 7/1937-4/1938 | | NAKINA |
| 11 | OMRX | Oscar Mayer & Co., Inc. (cars No. 3001-3020, 4001-4020 & 5001-5025) (Union Refrigerator Transit Co.) | 7/1935 | | NAKINA |
| 12 | OMRX | Oscar Mayer & Co., Inc. (cars No. 2000-2044) (General American Tank Car Corp.) | 7/1935 | | NAKINA |
| 13 | OMRX | Oscar Mayer & Co., Inc. | 7/1923-7/1932 | | NAKINA |
| 14 | OMRX | Oscar Meyer & Co. (cars no. 501-599, 801-899) (Mather Stock Car Co.) | Apr-38 | | NRHS |
| 15 | OMRX | *OSCAR MAYER & CO. (MATHER STOCK CAR CO.) | | | PWRC |
| 16 | OMRX | +OZARK MOUNTAIN RAILCAR | | | PWRC |
| 17 | OMRX | Ozark Mountain Railcar | | | RSRV |
| 18 | OMRX | OZARK MOUNTAIN RAILCAR LLC | | | SCAC4 |
