| 1 | XD | OAG Worldwide. | ICAO: XXD, Name changed from Offical Airline Guides (OAG). Non-airline org. relating to the airline industry | USA | AVCODES |
| 2 | XD | Air Transport Association of America (ATA) | ICAO: ATA, Non-airline org. relating to the airline industry | USA | AVCODES |
| 3 | XD | Universal Air Travel Plan (UATP) | ICAO: ATA, Non-airline org. relating ti the airline industry | USA | AVCODES |
| 4 | XD | Offical Airline Guides (OAG) | ICAO: XXD, Name changed to OAG Worldwide. Non-airline org. relating to the airline industry | USA | AVCODES |
| 5 | XD | Scheduled Airlines Traffic Offices, Inc. | Non-airline org. relating to the airline industry | USA | AVCODES |
| 6 | XDA | Bureau Veritas, S.A. | | F | AVCODES |
| 7 | XDA | Bureau Veritas | | | ICAO1 |
| 8 | XDD | Lockheed Duats | | USA | AVCODES |
| 9 | XDD | Lockheed DUATS | | | ICAO1 |
| 10 | XDEC | X D EXPRESS CORP | | | SCAC4 |
| 11 | XDEL1 | NS | | USA | TRAFFIC |
| 12 | XDGL | XENIOS DUTCH GROWERS LIMITED | | | SCAC4 |
| 13 | XDIR | XPRESS DIRECT (DIV OF U S XPRESS IN | | | SCAC4 |
| 14 | XDIT | EXPEDITE IT LLC | | | SCAC4 |
| 15 | XDS | Dispatch Services, Inc. | Non-airline Org. in airline industry | USA | AVCODES |
| 16 | XDS | Dispatch Services | | | ICAO1 |
| 17 | XDT | Date Transformation Corp. | | USA | AVCODES |
| 18 | XDT | Date Transformation Corp | | | ICAO1 |
| 19 | XDTZ | (XTRZ) RETIRED 10-19-93 ATP | | | PWRC |
| 20 | XDY | Dynair Services, Inc. | | USA | AVCODES |
| 21 | XDY | Dynair Services | | | ICAO1 |
