| Abbreviation | Definition |
|---|---|
| HYA | Hyannis, Massachusetts USA |
| HYC | High Wycombe, England, UK |
| HYD | Hyderabad, India |
| HYF | Hayfields, Papua New Guinea |
| HYG | Hydaburg, Alaska USA |
| HYL | Hollis, Alaska USA |
| HYN | HuangYan, Mainland China |
| HYR | Hayward, Wisconsin, USA |
| HYS | Hays, Kansas USA |
| HYX | Harry W. Browne Airport, Saginaw, Michigan USA |
| HZ | Hejaz Province |
| HZB | Hazebrouck, France |
| HZG | HanZhong, Mainland China |
| HZK | Husavik, Iceland |
| HZL | Hazleton, Pennsylvania, USA |
| I23 | Fayette County Airport, Washington Court House, Ohio USA |
| I86 | Perry County Airport, New Lexington, Ohio USA |
| IAD | Dulles International Airport, Reston, Virginia, (Washington, D.C.) USA |
| IAG | Niagara Falls, New York USA |
| IAH | Houston Hobby Intercontinental Airport, Houston, Texas USA |