| 1 | FFX | Flex Linhas Aéreas S.A. | Designator JH recalled by IATA | BR | AVCODES |
| 2 | FFX | Swann Chemical Co. | 7/1932-7/1935 | | NAKINA |
| 3 | FFX | Federal Phosphorus Co. | 7/1930 | | NAKINA |
| 4 | FFX | SWANN CHEMICAL CO. [FEDERAL PHOSPHORUS CO.] | | | PWRC |
| 5 | FFXC | FAIRFAX CARRIER INC | | | SCAC3 |
| 6 | FFXC | FREIGHT FOX INC | | | SCAC4 |
| 7 | FFXC | Fairfax Connector | | USA | TRAFFIC |
| 8 | FFXL | FREIGHT FINDER EXPRESS LTD | | | SCAC4 |
| 9 | FFXN | FREDONIA FLATBED X-PRESS INC | | | SCAC4 |
| 10 | FFXR | F F EXPRESS | | | SCAC4 |
