| 1 | ONY | 25Only Aviation GmbH | IATA: 4Q, Callsign: Only Jet, | D | AVCODES |
| 2 | ONYQ | OVERMYER DISTRIBUTION SERVICES INC | | | SCAC3 |
| 3 | ONYS | ORIGINAL NEW YORK SELTZER | | | SCAC3 |
| 4 | ONYS | OSNAYA ALEGRIA, AURELIO | | | SCAC4 |
| 5 | ONYW | ONLYWAY TRANSPORTATION INC | | | SCAC3 |
| 6 | ONYX | American Colloid Co. | 4/1970; added 7/1970; 1/1975-1/1980; eliminated 1/1985; eliminated 7/1985 | | NAKINA |
| 7 | ONYX | American Colloid Co. | 4/70; added 7/70; 1/75-1/80; eliminated 1/85 | | NRHS |
| 8 | ONYX | AMERICAN COLLOID COMPANY | | | PWRC |
| 9 | ONYX | American Colloid | | | RSRV |
