| 1 | OTP | Operadora de Transportes Aereos, S.A. de C.V. | Callsign: Operadora Aereo, | MEX | AVCODES |
| 2 | OTP | Operadora de Transportes Aereos | | | ICAO1 |
| 3 | OTPC | OWENS TRANSPORTATION COMPANY (A TEN | | | SCAC3 |
| 4 | OTPL | OCEAN TANKERS PTE LTD | | | SCAC3 |
| 5 | OTPN | ORACLE TRANSPORTATION SOLUTIONS INC | | | SCAC4 |
| 6 | OTPO | ODYSSEY TRANSPORT LTD | | | SCAC3 |
| 7 | OTPS | OVERSEAS TRANSPORT SERVICE CO. LTD. | | | SCAC3 |
| 8 | OTPS | OCEAN TRANSPORT AND SALES INC | | | SCAC4 |
| 9 | OTPT | O TRANSPORT | | | SCAC4 |
| 10 | OTPU | SEACUBE CONTAINERS LLC | | USA | BIC |
| 11 | OTPU | Seacube Container Leasing | | | RSRV |
| 12 | OTPW | ORTECH POWER | | | SCAC4 |
| 13 | OTPX | Otter Tail Power Co. | 7/1930-10/1957; eliminated 10/1959 | | NAKINA |
| 14 | OTPX | Otter Tail Power Co. | 4/38-10/57; eliminated 10/59 | | NRHS |
| 15 | OTPX | OTTERTAIL POWER COMPANY | | | PWRC |
| 16 | OTPX | Otter Tail Power | | | RSRV |
