| 1 | OAC | Oriental Airlines Limited | Callsign: Oriental Air, | WAN | AVCODES |
| 2 | OAC | Oriental Airlines | | | ICAO1 |
| 3 | OACH | CENTRAL TRANSPORTATION CO. {O.A. COOPER CO.} | | | PWRC |
| 4 | OACH | OUACHITA TERMINALS INC | | | SCAC4 |
| 5 | OACN | OA CARGO & TRANSPORTATION | | | SCAC4 |
| 6 | OACU | LINDE-HADJIKYRIAKOS GAS LTD. | | CY | BIC |
| 7 | OACU | HADJIKYRIAKOS INDUSTRIES LTD | | | SCAC4 |
| 8 | OACX | Central Transportation Co., Inc. | added 7/1983; eliminated 10/1988 | | NAKINA |
| 9 | OACX | The O.A. Cooper Co. | added 1/1974; 1/1975-1/1980; eliminated 5/1983 | | NAKINA |
| 10 | OACX | The O.A. Cooper Co. | added 1/74; 1/75-1/80; eliminated 5/83 | | NRHS |
| 11 | OACX | Central Transportation Co., Inc. | eliminated 10/88 | | NRHS |
| 12 | OACX | CENTRAL TRANSPORTATION CO. | | | PWRC |
| 13 | OACX | Central Transportation | | | RSRV |
