| 城市名称 | 机场三字代码 | 机场四字代码 | 机场名称 | 英文名称 |
| IHOSY | IHO | IHOSY | ||
| IHU | IHU | IHU | ||
| INISHMAAN | IIA | INISHMAAN | ||
| NISHINOOMOTE | IIN | NISHINOOMOTE | ||
| NISSANISLAND | IIS | NISSANISLAND | ||
| 伊热夫斯克 | IJK | IZHEVSK | ||
| IJUIJFILHO | IJU | IJUIJFILHO | ||
| 杰克逊维尔 | IJX | JACKSONVILLE | ||
| WILKESBORO | IKB | WILKESBORO | ||
| IKI | IKI | IKI | ||
| KANKAKEE | IKK | KANKAKEE | ||
| IKELA | IKL | IKELA | ||
| NIKOLSKI | IKO | NIKOLSKI | ||
| INKERMAN | IKP | INKERMAN | ||
| 季克西 | IKS | TIKSI | ||
| ILLAGA | ILA | ILLAGA | ||
| KILLEEN | ILE | KILLEEN | ||
| ILFORD | ILF | ILFORD | ||
| PHILADELPHIA | ILG | PHILADELPHIAPA/WILMT | ||
| ILIAMNA | ILI | ILIAMNA | ||
| ILAKA | ILK | ILAKA | ||
| WILLMAR | ILL | WILLMAR | ||
| 威尔明顿 | ILM | WILMINGTON | ||
| 威尔明顿 | ILN | WILMINGTON | ||
| ILOILOMANDUR | ILO | ILOILOMANDURRIAO | ||
| ILEDESPINS | ILP | ILEDESPINS | ||
| 伊洛林 | ILR | ILORIN | ||
| KILAGUNI | ILU | KILAGUNI | ||
| ILEG | ILX | ILEG | ||
| ISLAY | ILY | ISLAY | ||
| 日利纳 | ILZ | ZILINAD.HRICOV | ||
| IAMALELE | IMA | IAMALELE | ||
| IMBAIMADAI | IMB | IMBAIMADAI | ||
| IMONDA | IMD | IMONDA | ||
| IMPHALMUNICI | IMF | IMPHALMUNICIPAL | ||
| INHAMINGA | IMG | INHAMINGA | ||
| INE | IMI | INE | ||
| SIMIKOT | IMK | SIMIKOT | ||
| IMPERIAL | IML | IMPERIAL | ||
| IMMOKALEE | IMM | IMMOKALEE | ||
| IMANE | IMN | IMANE | ||
| 泽米奥 | IMO | ZEMIO | ||
| IMPERATRIZ | IMP | IMPERATRIZ | ||
| IRONMOUNT | IMT | IRONMOUNT | ||
| NIMROZ | IMZ | NIMROZ | ||
| INTA | INA | INTA | ||
| INDEPENDENCE | INB | INDEPENDENCE | ||
| 辛代 | INE | CHINDE | ||
| INGUEZZAM | INF | INGUEZZAM | ||
| LAGOARGENTIN | ING | LAGOARGENTINO | ||
| 伊尼扬巴内 | INH | INHAMBANE | ||
| NIS | INI | NIS | ||
| INJUNE | INJ | INJUNE | ||
| WINK | INK | WINK | ||
| INTLFALLS | INL | INTLFALLS | ||
| INNAMINCKA | INM | INNAMINCKA | ||
| INONGO | INO | INONGO | ||
| INISHEER | INQ | INISHEER | ||
| SAULTSTE.MAR | INR | SAULTSTE.MARIEKINCHE | ||
| WINSTONSALEM | INT | WINSTONSALEM |
机场三字代码简称“三字代码”，由国际航空运输协会（IATA ,International Air Transport Association）制定。国际航空运输协会（IATA）对世界上的国家、城市、机场、加入国际航空运输协会的航空公司制定了统一的编码。在空运中以三个英文字母简写航空机场名，称“机场三字代码”或“三字代码”。
世界上每一个民航机场都有自己唯一的三字码，部分空军机场也有三字码。机场三字代码查询支持国际机场三字代码查询，国内机场3字代码查询，全球机场三字代码查询，国内机场三字代码，始发机场三字代码，机场三字代码表，国际机场三字代码表查询。