| Abbreviation | Definition |
|---|---|
| XSO | Siocon, Philippines |
| XSP | Singapore- Seletar Airport, Singapore |
| XTG | Thargomindah, Queensland, Australia |
| XTL | Tadoule Lake, Manitoba, Canada |
| XTO | Taroom, Queensland, Australia |
| XTR | Tara, Queensland, Australia |
| XUB | Yellow Bud VOR (VHF Omni-Range navigational station), Circleville, Ohio USA |
| XUZ | Xuzhou, Mainland China |
| XVG | Longville Municipal Airport, Longville, Minnesota USA |
| XVL | Vinh Long Airport, Vinh Long, Vietnam |
| XXN | Willits Municipal Airport, Ells Field, Willits, California USA |
| XYA | Yandina, Solomon Islands |
| XYD | Part Dieu Railway Service, Lyon, France |
| XYE | Ye, Burma ( Myanmar) |
| XYR | Yellow River, Papua New Guinea |
| XZA | Zabre, Burkina Faso |
| Y15 | Cheboygan City- County Airport, Cheboygan, Michigan USA |
| Y31 | West Branch Community Airport, West Branch, Michigan USA |
| Y47 | Oakland Southwest Airport, New Hudson, Michigan USA |
| Y58 | Sleepy Eye Municipal Airport, Sleepy Eye, Minnesota USA |