| 1 | HYT | YTO Cargo Airlines Co., Ltd. | IATA: YG, Callsign: Quick Air, IATA Prefix: 860, | PRC | AVCODES |
| 2 | HYTA | HYTRACKER MANUFACTURING LTD | | | SCAC4 |
| 3 | HYTI | HIGHWAY TRANSPORT SERVICES INC | | | SCAC4 |
| 4 | HYTK | HANEY TRUCKING INC | | | SCAC4 |
| 5 | HYTL | HYDROTESTORS 2000 LTD | | | SCAC4 |
| 6 | HYTP | HIGHWAY TRANSPORT PETROLEUM LLC | | | SCAC4 |
| 7 | HYTT | HIGHWAY TRANSPORT LOGISTICS INC | | | SCAC4 |
| 8 | HYTX | Hytrans, Inc. | added 7/1977; 1/1980; eliminated 10/1983 | | NAKINA |
| 9 | HYTX | Hygrade Food Products Corp. | 4/1947-7/1954; eliminated 10/1954 | | NAKINA |
| 10 | HYTX | Hygrade Food Products Corp. | Jan-52 | | NRHS |
| 11 | HYTX | Hytrans, Inc. | added 7/77; 1/80; eliminated 10/83 | | NRHS |
| 12 | HYTX | HYGRADE FOOD PRODUCTS CORP. | | | PWRC |
