| 1 | HOT | Broadland Balloon Flights | Callsign: Hot Air, | GB | AVCODES |
| 2 | HOT | Hot Air | Callsign: Hot Air, Merged into British Air Ferries during 1989 | GB | AVCODES |
| 3 | HOT | Valletta Airlines Limited | Callsign: Sunny Sky, | M | AVCODES |
| 4 | HOTA | H O T SERVICES INC | | | SCAC4 |
| 5 | HOTB | H O T EXPRESS INC | | | SCAC4 |
| 6 | HOTD | HORTON, DENNIS TRUCKING | | | SCAC4 |
| 7 | HOTH | HANDS ON TRANSPORT INC | | | SCAC4 |
| 8 | HOTL | HIGH OCTANE TRANSPORTATION LLC | | | SCAC4 |
| 9 | HOTO | H O | | | SCAC4 |
| 10 | HOTR | HOUFF TRANSFER INC | | | PWRC |
| 11 | HOTR | HOUFF TRANSFER, INCORPORATED | | | SCAC1 |
| 12 | HOTR | HOUFF TRANSFER INCORPORATED | | | SCAC4 |
| 13 | HOTT | HOT-Z TRANSPORT COMPANY | | | SCAC4 |
| 14 | HOTU | HOYER GLOBAL TRANSPORT | | NL | BIC |
| 15 | HOTU | HOYER GLOBAL TRANSPORT BV | | | SCAC4 |
| 16 | HOTX | Chicago Freight Car Leasing Co. | added 1/1963; 7/1965-1/1980; added 10/1986 | | NAKINA |
| 17 | HOTX | Chicago Freight Car Leasing Co. | 7/65-1/80; added 10/86 | | NRHS |
| 18 | HOTX | CHICAGO FREIGHT CAR LEASING CO. | | | PWRC |
| 19 | HOTX | Chicago Freight Car Leasing | | | RSRV |
| 20 | HOTY | HOT OIL TRANSPORT LLC | | | SCAC4 |
| 21 | HOTZ | HOUSE TRACK | | | PWRC |
