| 1 | OTO | Aerovento, S.A. | Callsign: OTO, | E | AVCODES |
| 2 | OTOB | OVERLAND TRUCKING OF UTAH INC | | | SCAC4 |
| 3 | OTOE | ONE TWO ONE ZERO EIGHT FOUR ONE (12 | | | SCAC4 |
| 4 | OTOF | ONE THREE ONE FIVE FOUR THREE FIVE | | | SCAC4 |
| 5 | OTOG | OTTOS GAS COMPANY INC | | | SCAC3 |
| 6 | OTOH | ONE THREE ONE THREE EIGHT | | | SCAC4 |
| 7 | OTOI | OTTOTRANS INC | | | SCAC4 |
| 8 | OTOK | OTTOS TRUCKING SA DE CV | | | SCAC4 |
| 9 | OTOKAR | Otokar Otomotiv ve Savunma Sanayi A.Ş., | | TR | TRAFFIC |
| 10 | OTOP | OTTE OIL PROPANE INC | | | SCAC4 |
| 11 | OTOR | OTTOMEIER TRUCKING | | | SCAC3 |
| 12 | OTOS | O'TOOLS RENT OR BUY | | | SCAC4 |
| 13 | OTOT | OTTO TRANSFER INC | | | SCAC3 |
| 14 | OTOX | Otto Milk Co. | 7/1935-4/1947 | | NAKINA |
| 15 | OTOX | Otto Milk Co. | Apr-38 | | NRHS |
| 16 | OTOX | OTTO MILK CO. | | | PWRC |
