| 1 | XF | Vladivostok Air JSC | ICAO: VLK, Callsign: Vladair, IATA Prefix: 277, Merged with SAT Airlines to form Aurora on 14 December 2013. ICAO callsign changed from Vladivostok Air | RUS | AVCODES |
| 2 | XF | Vladivostock Air | ICAO: HSL, ICAO designator changed to VLK | RUS | AVCODES |
| 3 | XF | Hispania, S.A. | ICAO: HSL, IATA designator changed to HH | E | AVCODES |
| 4 | XF | Mongolian Airways Cargo | ICAO: MGW, Callsign: Great Mongolian, IATA Prefix: 848, | MGL | AVCODES |
| 5 | XFA | Fly Asian Express Sdn Bhd | IATA: D7, IATA Prefix: 843, Name changed to AirAsia X Sdn Bhd. | MAL | AVCODES |
| 6 | XFA | FlyAsianXpress | IATA: D7 | | ICAO1 |
| 7 | XFCU | HUBEI SINOPRHORUS ELECTRONICS MATERIALS CO LTD | | PRC | BIC |
| 8 | XFCU | HUBEI XINGFA CHEMICALS GROUP CO LTD | | | SCAC4 |
| 9 | XFCZ | (XTRZ) XTRA INTERMODAL | | | PWRC |
| 10 | XFEZ | FLORIDA EAST COAST RWY | | | PWRC |
| 11 | XFEZ | Florida East Coast Railway | | | RSRV |
| 12 | XFL | Executive Fliteways, Inc. | Callsign: Ex-Flight, | USA | AVCODES |
| 13 | XFS | American Flight Service Systems, Inc. | | USA | AVCODES |
| 14 | XFS | American Flight Service Systems | | | ICAO1 |
| 15 | XFSI | XTREME FREIGHT SERVICE INC | | | SCAC4 |
| 16 | XFTC | X-FACTOR TRANSPORTATION COMPANY | | | SCAC4 |
| 17 | XFX | Airways Corporation Of New Zealand Limited | Callsign: Aircorp, | NZ | AVCODES |
| 18 | XFX | Airways Corporation of New Zealand | | | ICAO1 |
