| 1 | ORP | Aerocorp, S.A. de C.V. | Callsign: Corpsa, | MEX | AVCODES |
| 2 | ORP | Aerocorp | | | ICAO1 |
| 3 | ORPF | OR PAC FEED & FORAGE LTD | | | SCAC4 |
| 4 | ORPH | ORPHEAS NAVIGATION INC | | | SCAC4 |
| 5 | ORPI | OYSTER RIVER PETROLEUM INC | | | SCAC4 |
| 6 | ORPP | O'ROURKE PETROLEUM PRODUCTS | | | SCAC4 |
| 7 | ORPQ | OWL ROCK PRODUCTS CO | | | SCAC3 |
| 8 | ORPT | OREGON PETROLEUM TRANSPORT COMPANY | | | SCAC4 |
| 9 | ORPU | OJC OCETROVSKIY RIVER PORT | | RUS | BIC |
| 10 | ORPU | OJC OCETROVSKIY RIVER PORT | | | SCAC4 |
| 11 | ORPX | O.E. Linsin, Inc. | 7/1937 (not listed) | | NAKINA |
| 12 | ORPX | Orient Petroleum Co. (Atlantic-Pacific & Gulf Refining Co.) | 7/1932-7/1935 | | NAKINA |
| 13 | ORPX | Orient Petroleum Co. | 7/1930 | | NAKINA |
| 14 | ORPX | O.E. LINSIN [ATLANTIC-PACIFIC & GULF REFINING CO.; ORIENT PETROLEUM CO.] | | | PWRC |
