Los primeros dós caracteres usados en el código definen el país donde se ubica el aeropuertos, estos prefijos son:
| Código prefijo |
País |
| AG |
Islas Salomón |
| AN |
Nauru |
| AY |
Papúa Nueva Guinea |
| BG |
Groenlandia |
| BI |
Islandia |
| C |
Canadá |
| DA |
Algeria |
| DB |
Benín |
| DF |
Burkina Faso |
| DG |
Ghana |
| DI |
Costa de Marfil |
| DN |
Nigeria |
| DR |
Níger |
| DT |
Túnez |
| DX |
Togo |
| EB |
Bélgica |
| ED |
Alemania (civil) |
| EE |
Estonia |
| EF |
Finlandia |
| EG |
Reino Unido |
| EH |
Paises Bajos |
| EI |
República de Irlanda |
| EK |
Dinamarca |
| EL |
Luxemburgo |
| EN |
Noruega |
| EP |
Polonia |
| ES |
Suecia |
| ET |
Alemania (militar) |
| EV |
Letonia |
| EY |
Lituania |
| FA |
Sudáfrica |
| FB |
Botswana |
| FC |
República del Congo |
| FD |
Swazilandia |
| FE |
República Centroafricana |
| FG |
Guinea Ecuatorial |
| FH |
Isla Ascensión |
| FI |
República de Mauricio |
| FJ |
Territorio Británico en el Océano Índico |
| FK |
Camerún |
| FL |
Zambia |
| FM |
Comoros, Madagascar, Mayotte, Réunion |
| FN |
Angola |
| FO |
Gabón |
| FP |
San Tomé y Príncipe |
| FQ |
Mozambique |
| FS |
Islas Seychelles |
| FT |
Chad |
| FV |
Zimbabwe |
| FW |
Malawi |
| FX |
Lesotho |
| FY |
Namibia |
| FZ |
República Democrática del Congo |
| GA |
Mali |
| GB |
Gambia |
| GC |
Islas Canarias |
| GE |
Ceuta y Melilla |
| GF |
Sierra Leona |
| GG |
Guinea-Bissau |
| GL |
Liberia |
| GM |
Marruecos |
| GO |
Senegal |
| GQ |
Mauritania |
| GS |
Sahara Occidental |
| GU |
Guinea |
| GV |
Cabo Verde |
| HA |
Etiopía |
| HB |
Burundi |
| HC |
Somalia |
| HD |
Djibouti (también HF) |
| HE |
Egipto |
| HF |
Djibouti (también HD) |
| HH |
Eritrea |
| HK |
Kenia |
| HL |
Libia |
| HR |
Rwanda |
| HS |
Sudán |
| HT |
Tanzania |
| HU |
Uganda |
| K |
Porción continental de Estados Unidos |
| LA |
Albania |
| LB |
Bulgaria |
| LC |
Chipre |
| LD |
Croacia |
| LE |
España |
| LF |
Francia, incluyendo San Pedro y Miquelón |
| LG |
Grecia |
| LH |
Hungría |
| LI |
Italia |
| LJ |
Eslovenia |
| LK |
República Checa |
| LL |
Israel |
| LM |
Malta |
| LN |
Mónaco |
| LO |
Austria |
| LP |
Portugal, iincluyendo las Azores |
| LQ |
Bosnia y Herzegovina |
| LR |
Romania |
| LS |
Suiza |
| LT |
Turquia |
| LU |
Moldavia |
| LV |
Franja de Gaza |
| LW |
Macedonia |
| LX |
Gibraltar |
| LY |
Serbia y Montenegro |
| LZ |
Eslovaquia |
| MB |
Islas Turks y Caicos |
| MD |
República Dominicana |
| MG |
Guatemala |
| MH |
Honduras |
| MK |
Jamaica |
| MM |
México |
| MN |
Nicaragua |
| MP |
Panamá |
| MR |
Costa Rica |
| MS |
El Salvador |
| MT |
Haití |
| MU |
Cuba |
| MW |
Islas Caimán |
| MY |
Bahamas |
| MZ |
Belice |
| NC |
Islas Cook |
| NF |
Fiji, Tonga |
| NG |
Kiribati (Islas Gilbert), Tuvalu |
| NI |
Niue |
| NL |
Wallis y Futuna |
| NS |
Samoa |
| NT |
Polinesia Francesa |
| NV |
Vanuatu |
| NW |
Nueva Caledonia |
| NZ |
Nueva Zelanda |
| OA |
Afghanistán |
| OB |
Bahrain |
| OE |
Arabia Saudí |
| OI |
Irán |
| OJ |
Jordania y Cisjordania |
| OK |
Kuwait |
| OL |
Líbano |
| OM |
Emiratos Árabes Unidos |
| OO |
Omán |
| OP |
Pakistan |
| OR |
Iraq |
| OS |
Siria |
| OT |
Qatar |
| OY |
Yemen |
| PA |
Alaska solamente |
| PB |
Baker Island |
| PC |
Kiribati (Canton Airfield, Phoenix Islands) |
| PF |
Fort Yukon, Alaska |
| PG |
Guam, Islas Marianas del Norte |
| PH |
Hawaii only |
| PJ |
Johnston Atoll |
| PK |
Islas Marshall |
| PL |
Kiribati (Line Islands) |
| PM |
Midway Island |
| PO |
Oliktok Long Range Radar Station, Alaska |
| PP |
Point Lay, Alaska |
| PT |
Estados Federados de Micronesia, Palau |
| PW |
Wake Island |
| RC |
Taiwan |
| RJ |
Japón (la mayor parte del país) |
| RK |
Corea del Sur |
| RO |
Japan (Okinawa Prefecture and Yoron) |
| RP |
Filipinas |
| SA |
Argentina |
| SB |
Brasil (also SD, SN, SS and SW) |
| SC |
Chile |
| SD |
Brasil (also SB, SN, SS and SW) |
| SE |
Ecuador |
| SF |
Islas Malvinas |
| SG |
Paraguay |
| SK |
Colombia |
| SL |
Bolivia |
| SM |
Surinam |
| SN |
Brasil (also SB, SD, SS and SW) |
| SO |
Guayana Francesa |
| SP |
Perú |
| SS |
Brasil (also SB, SD, SN and SW) |
| SU |
Uruguay |
| SV |
Venezuela |
| SW |
Brasil (also SB, SD, SN and SS) |
| SY |
Guyana |
| TA |
Antigua y Barbuda |
| TB |
Barbados |
| TD |
Dominica |
| TF |
Guadeloupe |
| TG |
Grenada |
| TI |
Islas Vírgenes de los Estados Unidos |
| TJ |
Puerto Rico |
| TK |
Saint Kitts and Nevis |
| TL |
Saint Lucia |
| TN |
Netherlands Antilles, Aruba |
| TQ |
Anguilla |
| TR |
Montserrat |
| TT |
Trinidad y Tobago |
| TU |
British Virgin Islands |
| TV |
Saint Vincent and the Grenadines |
| TX |
Bermuda |
| U |
Russia (except UA, UB, UG, UK, UM and UT) |
| UA |
Kazakhstan, Kyrgyzstan |
| UB |
Azerbaijan |
| UG |
Armenia, Georgia |
| UK |
Ucrania |
| UM |
Belarus |
| UT |
Tajikistan, Turkmenistan, Uzbekistan |
| VA |
India (also VE, VI and VO) |
| VC |
Sri Lanka |
| VD |
Cambodia |
| VE |
India (also VA, VI and VO) |
| VG |
Bangladesh |
| VH |
Hong Kong |
| VI |
India (also VA, VE and VO) |
| VL |
Laos |
| VM |
Macao |
| VN |
Nepal |
| VO |
India (also VA, VE and VI) |
| VQ |
Bhutan |
| VR |
Maldivas |
| VT |
Tailandia |
| VV |
Vietnam |
| VY |
Myanmar |
| WA |
Indonesia (also WI, WQ and WR) |
| WB |
Malaysia (also WM), Brunei |
| WI |
Indonesia (also WA, WQ and WR) |
| WM |
Malaysia (also WB) |
| WP |
Timor Oriental |
| WQ |
Indonesia (also WA, WI and WR) |
| WR |
Indonesia (also WA, WI and WQ) |
| WS |
Singapore |
| Y |
Australia |
| Z |
República Popular China (except ZK and ZM) |
| ZK |
Corea del Norte |
| ZM |
Mongolia |
