| 1 | XI | Aeronautical Telecommunications Ltd. (AEROTEL) | ICAO: XXI, | JA | AVCODES |
| 2 | XI | International Aeradio Ltd. | | GB | AVCODES |
| 3 | XI | International Aeradio Plc. | ICAO: IAL, Callsign: Aeradio, Desigantor XI recalled by IATA | GB | AVCODES |
| 4 | XIA | Irving Oil Ltd (Gander Fbo) | | CDN | AVCODES |
| 5 | XIA | Irving Oil | | | ICAO1 |
| 6 | XIAN | Xi'an Metro | | PRC | TRAFFIC |
| 7 | XIBL | XPRESS INTERNATIONAL BANGLADESH LTD | | | SCAC4 |
| 8 | XIIU | FRACHTIMPEX LTD. | | BG | BIC |
| 9 | XINC | XTRAC INC | | | SCAC4 |
| 10 | XINU | TEXTAINER EQUIPMENT MANAGEMENT LTD | | BM | BIC |
| 11 | XINU | INTERNATIONAL CONTAINER FINANCE LTD | | | SCAC4 |
| 12 | XISA | XPRESS INTERNA | | | SCAC4 |
