| 1 | FLJ | Flynor Jet S.p.A. | Callsign: Flynor Jet, Merged into Sirio. Name changed from Flynor | I | AVCODES |
| 2 | FLJ | Flynor | Callsign: Flynor Jet, Name changed to Flynor Jet S.p.A. | I | AVCODES |
| 3 | FLJ | Flairjet Limited | Callsign: Flairjet, Name changed to Flexjet Operations Limited w.e.f. 01 October 2020. ICAO callsign changed to Flexiar. | GB | AVCODES |
| 4 | FLJ | Flexjet Operations Limited | Callsign: Flexair, Name changed from Flairjet Limited w.e.f. 01 October 2020. ICAO callsign changed from Flairjet. | GB | AVCODES |
| 5 | FLJ | Frövi - Ludvika Järnväg | 1871 - 1925 | S | svenska-lok.se |
| 6 | FLJC | FLO-JO CONTRACTING INC | | | SCAC3 |
| 7 | FLJD | FLOYD, J D TRUCKING COMPANY | | | SCAC3 |
| 8 | FLJE | FLESSNER, JOHN E | | | SCAC3 |
| 9 | FLJG | FLORES, JOSE G | | | SCAC4 |
| 10 | FLJO | FLINT, JOE | | | SCAC3 |
| 11 | FLJO | FLORES, JAIME G CHB | | | SCAC4 |
| 12 | FLJR | FRIEL, JOHN R | | | SCAC3 |
| 13 | FLJS | FLORES, JOSE | | | SCAC3 |
| 14 | FLJT | FLYING J TRANSPORTATION INC | | | SCAC3 |
| 15 | FLJT | FLYING J TRANSPORTATION LLC | | | SCAC4 |
| 16 | FLJX | Big West Oil LLC | added 1/2002; eliminated 1/2003; 7/2005 (not listed) | | NAKINA |
| 17 | FLJX | Big West Oil Co. | added 10/1993; 1/1994-7/2000; eliminated 1/2002 | | NAKINA |
| 18 | FLJX | Big West Oil Co. | added 10/93; 1/94-7/2000 | | NRHS |
| 19 | FLJX | BIG WEST OIL, LLC | | | PWRC |
| 20 | FLJX | F.J. Lewis Petroleum (Big West Oil) | | | RSRV |
| 21 | FLJX | BIG WEST OIL COMPANY | | | SCAC4 |
