

| AAA | Anaa | Anaa | French Polynesia |
| AAB | Arrabury | Arrabury | Australia |
| AAC | Arish | El Arish International Airport | Egypt |
| AAD | Ad-Dabbah | Ad-Dabbah | Sudan |
| AAE | Annaba | Les Salines | Algeria |
| AAF | Apalachicola (FL) | Municipal | USA |
| AAG | Arapoti | Arapoti | Brazil |
| AAH | Aachen | Aachen/Merzbrück | Germany |
| AAI | Arraias | Arraias | Brazil |
| AAJ | Awaradam | Cayana Airstrip | Suriname |
| AAK | Aranuka | Aranuka | Kiribati |
| AAL | Aalborg | Aalborg Airport (Aalborg Lufthavn) | Denmark |
| AAM | Mala Mala | Mala Mala | South Africa |
| AAN | Al Ain | Al Ain International Airport | United Arab Emirates |
| AAO | Anaco | Anzualegui | Venezuela |
| AAP | Samarinda | APT Pranoto Airport | Indonesia |
| AAQ | Anapa | Vityazevo Airport | Russia |
| AAR | Aarhus | Tirstrup | Denmark |
| AAS | Apalapsili | Apalapsili | Indonesia |
| AAT | Altay | Altay Airport | Xinjiang, China |
| AAU | Asau | Asau | Samoa |
| AAV | Alah | Alah | Philippines |
| AAW | Abbottabad | Abbottabad | Pakistan |
| AAX | Araxa | Araxa | Brazil |
| AAY | Al Ghaydah | Al Ghaydah | Yemen |
| AAZ | Quetzaltenango | Quetzaltenango Airport | Guatemala |
| ABA | Abakan | Abakan International Airport | Russia |
| ABB | Asaba | Asaba International | Nigeria |
| ABC | Albacete | Los Llanos | Spain |
| ABD | Abadan | Abadan | Iran |
| ABE | Allentown (PA) | Lehigh Valley International | USA |
| ABF | Abaiang | Abaiang | Kiribati |
| ABG | Abingdon | Abingdon | Australia |
| ABH | Alpha | Alpha | Australia |
| ABI | Abilene | Municipal | USA |
| ABJ | Abidjan | Felix Houphouet Boigny International | Cote d'Ivoire |
| ABK | Kabri Dar | Kabri Dar | Ethiopia |
| ABL | Ambler (AK) | Ambler | USA |
| ABM | Bamaga | Bamaga | Australia |
| ABN | Albina | Albina | Suriname |
| ABO | Aboisso | Aboisso | Cote d'Ivoire |
| ABP | Atkamba | Atkamba | Papua New Guinea |
| ABQ | Albuquerque (NM) | Albuquerque International Sunport | USA |
| ABR | Aberdeen (SD) | Municipal | USA |
| ABS | Abu Simbel | Abu Simbel Airport | Egypt |
| ABT | Al-Baha | Al-Aqiq | Saudi Arabia |
| ABU | Atambua | Atambua | Indonesia |
| ABV | Abuja | Nnamdi Azikiwe International Airport | Nigeria |
| ABW | Abau | Abau | Papua New Guinea |
| ABX | Albury | Albury | Australia |
| ABY | Albany (GA) | Dougherty County | USA |
| ABZ | Aberdeen | Dyce | United Kingdom |
| ACA | Acapulco | Acapulco International Airport | Mexico |
| ACB | Bellaire | Antrim County | USA (MI) |
| ACC | Accra | Kotoka International Airport | Ghana |
| ACD | Acandi | Acandi | Colombia |
| ACE | Lanzarote | Lanzarote | Canary Islands, Spain |
| ACH | Altenrhein | Altenrhein | Switzerland |
| ACI | Alderney (one of the Channel Islands) | Alderney Airport - The Blaye | United Kingdom |
| ACK | Nantucket (MA) | Memorial | USA |
| ACL | Aguaclara | Aguaclara | Colombia |
| ACM | Arica | Arica | Colombia |
| ACN | Ciudad Acuna | International | Mexico |
| ACO | Ascona | Ascona | Switzerland |
| ACR | Araracuara | Araracuara | Colombia |
| ACS | Achinsk | Achinsk | Russia |
| ACT | Waco (TX) | Municipal | USA |
| ACU | Achutupo | Achutupo | Panama |
| ACV | Arcata (CA) | Arcata | USA |
| ACY | Atlantic City (NJ) | Atlantic City International | USA |
| ACZ | Zabol | Zabol A/P | Iran |
| ADA | Adana | Adana | Turkey |
| ADB | Izmir | Adnan Menderes Airport | Turkey |
| ADC | Andakombe | Andakombe | Papua New Guinea |
| ADD | Addis Ababa | Bole International Airport | Ethiopia |
| ADE | Aden | Aden International Airport | Yemen |
| ADF | Adiyaman | Adiyaman | Turkey |
| ADG | Adrian (MI) | Lenawee County | USA |
| ADH | Aldan | Aldan | Russia |
| ADI | Arandis | Arandis | Namibia |
| ADJ | Amman | Marka International Airport | Jordan |
| ADK | Adak Island (AK) | Adak Island NS | USA |
| ADL | Adelaide | Adelaide International Airport | Australia |
| ADM | Ardmore (OK) | Municipal Airport | USA |
| ADN | Andes | Andes | Colombia |
| ADO | Andamooka | Andamooka | Australia |
| ADP | Anuradhapura | Anuradhapura | Sri Lanka |
| ADQ | Kodiak (AK) | Kodiak Airport | USA |
| ADR | Andrews (SC) | Andrews | USA |
| ADS | Dallas, Addison (TX) | Addison Airport | USA |
| ADT | Ada (OK) | Ada | USA |
| ADU | Ardabil | Ardabil | Iran |
| ADV | Andover | Andover | United Kingdom |
| ADW | Camp Springs (MD) | Andrews AFB | USA |
| ADX | St Andrews | RAF Leuchars | Scotland, United Kingdom |
| ADY | Alldays | Alldays | South Africa |
| ADZ | San Andres Island | San Andrés Airport | Colombia |
| AEA | Abemama Atoll | Abemama Atoll | Kiribati |
| AED | Aleneva (AK) | Aleneva | USA |
| AEG | Aek Godang | Aek Godang | Indonesia |
| AEH | Abecher | Abecher | Chad |
| AEK | Aseki | Aseki | Papua New Guinea |
| AEL | Albert Lea (MN) | Albert Lea | USA |
| AEO | Aioun El Atrouss | Aioun El Atrouss | Mauritania |
| AEP | Buenos Aires | Jorge Newbery Airport | Argentina |
| AER | Adler/Sochi | Adler-Sochi International Airport | Russia |
| AES | Aalesund | Vigra | Norway |
| AET | Allakaket (AK) | Allakaket Airport | USA |
| AEX | Alexandria (LA) | Alexandria International Airport | USA |
| AEY | Akureyri | Akureyri | Iceland |
| AFA | San Rafael | San Rafael | Argentina |
| AFD | Port Alfred | Port Alfred | South Africa |
| AFF | Colorado Springs (CO) | USAF Academy | USA |
| AFI | Amalfi | Amalfi | Colombia |
| AFL | Alta Floresta | Alta Floresta | Brazil |
| AFN | Jaffrey (NH) | Municipal | USA |
| AFO | Afton (WY) | Municipal | USA |
| AFR | Afore | Afore | Papua New Guinea |
| AFT | Afutara | Afutara Aerodrome | Solomon Islands |
| AFW | Fort Worth (TX) | Fort Worth Alliance | USA |
| AFY | Afyon | Afyon | Turkey |
| AGA | Agadir | Agadir–Al Massira Airport | Morocco |
| AGB | Augsburg | Augsburg Airport (Flughafen Augsburg) | Germany |
| AGC | Pittsburgh (PA) | Allegheny County Airport | USA |
| AGD | Anggi | Anggi | Indonesia |
| AGE | Wangerooge | Flugplatz Wangerooge | Germany |
| AGF | Agen | Agen La Garenne Airport | France |
| AGG | Angoram | Angoram | Papua New Guinea |
| AGH | Angelholm, Helsingborg | Ängelholm–Helsingborg Airport | Sweden |
| AGI | Wageningen | Wageningen | Suriname |
| AGJ | Aguni | Aguni | Japan |
| AGK | Kagua | Kagua | Papua New Guinea |
| AGL | Wanigela | Wanigela | Papua New Guinea |
| AGM | Tasiilaq | Tasiilaq | Greenland |
| AGN | Angoon (AK) | Angoon Seaplane Base | USA |
| AGO | Magnolia (AR) | Magnolia Municipal Airport | USA |
| AGP | Málaga | Málaga–Costa del Sol Airport[ | Spain |
| AGQ | Agrinion | Agrinion | Greece |
| AGR | Agra | Kheria | India |
| AGS | Augusta (GA) | Bush Field | USA |
| AGT | Ciudad del Este | Guarani International Airport (Alejo Garcia) | Paraguay |
| AGU | Aguascalientes | Jesús Terán Peredo International Airport | Mexico |
| AGV | Acarigua | Oswaldo Guevara Mujica Airport | Venezuela |
| AGW | Agnew | Agnew Airport | Australia |
| AGX | Agatti Island | Agatti Island | India |
| AGY | Argyle Downs | Argyle Downs Airport | Australia |
| AGZ | Aggeneys | Aggeneys Airport | South Africa |
| AHB | Abha | Abha Regional Airport | Saudi Arabia |
| AHC | Herlong (CA) | Amedee AAF | USA |
| AHD | Ardmore (OK) | Downtown | USA |
| AHE | Ahe | Ahe Airport | French Polynesia |
| AHF | Arapahoe (NE) | Municipal | USA |
| AHH | Amery (WI) | Municipal | USA |
| AHI | Amahai | Amahai | Indonesia |
| AHL | Aishalton | Aishalton | Guyana |
| AHN | Athens (GA) | Athens-Ben Epps Airport | USA |
| AHO | Alghero | Fertilia | Italy |
| AHS | Ahuas | Ahuas | Honduras |
| AHT | Amchitka (AK) | Amchitka | USA |
| AHU | Al Hoceima | Charif Al Idrissi | Morocco |
| AHY | Ambatolahy | Ambatolahy | Madagascar |
| AHZ | Alpe D Huez | Alpe D Huez | France |
| AIA | Alliance (NE) | Alliance | USA |
| AIB | Anita Bay (AK) | Anita Bay | USA |
| AIC | Airok | Airok | Marshall Islands |
| AID | Anderson (IN) | Municipal | USA |
| AIE | Aiome | Aiome | Papua New Guinea |
| AIF | Assis | Assis | Brazil |
| AIG | Yalinga | Yalinga | Central African Republic |
| AIH | Aiambak | Aiambak | Papua New Guinea |
| AII | Alisabieh | Alisabieh | Djibouti |
| AIK | Aiken (SC) | Municipal | USA |
| AIL | Ailigandi | Ailigandi | Panama |
| AIM | Ailuk Island | Ailuk Island | Marshall Islands |
| AIN | Wainwright (AK) | Wainwright | USA |
| AIO | Atlantic IA | Municipal | USA |
| AIP | Ailinglapalap Island | Ailinglapalap Island | Marshall Islands |
| AIR | Aripuana | Aripuana | Brazil |
| AIS | Arorae Island | Arorae Island | Kiribati |
| AIT | Aitutaki | Aitutaki | Cook Islands |
| AIU | Atiu Island | Atiu Island | Cook Islands |
| AIV | Aliceville (AL) | George Downer | USA |
| AIW | Ai-Ais | Ai-Ais | Namibia |
| Atlantic City (NJ) | Bader Field (closed 2006) | USA | |
| AIZ | Kaiser/Lake Ozark (MO) | Lee C Fine Memorial | USA |
| AJA | Ajaccio | Campo Dell Oro | France |
| AJF | Jouf | Jouf | Saudi Arabia |
| AJI | Agri | Agri | Turkey |
| AJJ | Akjoujt | Akjoujt | Mauritania |
| AJL | Aizawl | Aizawl | India |
| AJN | Anjouan, Nzwani Island | Ouani | Comoros |
| AJO | Aljouf | Aljouf | Yemen |
| AJR | Arvidsjaur | Arvidsjaur | Sweden |
| AJS | Abreojos | Abreojos | Mexico |
| AJU | Aracaju | Aracaju - Santa Maria Airport | Brazil |
| AJY | Agades | Mano Dayak International Airport | Niger |
| AKA | Ankang | Ankang | PR China |
| AKB | Atka (AK) | Atka | USA |
| AKC | Akron/Canton (OH) | Akron Fulton International Airport | USA |
| AKD | Akola | Akola | India |
| AKE | Akieni | Akieni | Gabon |
| AKF | Kufrah | Kufrah | Libya |
| AKG | Anguganak | Anguganak | Papua New Guinea |
| AKI | Akiak (AK) | Akiak | USA |
| AKJ | Asahikawa | Asahikawa | Japan |
| AKK | Akhiok | Akhiok SPB | USAAK |
| AKL | Auckland | Auckland International Airport | New Zealand |
| AKL | Auckland | Metropolitan Area | New Zealand |
| AKM | Zakouma | Zakouma | Chad |
| AKN | King Salmon (AK) | King Salmon | USA |
| AKO | Akron (CO) | Colorado Plains Regional Airport | USA |
| AKP | Anaktuvuk (AK) | Anaktuvuk | USA |
| AKQ | Astraksetra | Gunung Batin | Indonesia |
| AKR | Akure | Akure | Nigeria |
| AKS | Auki | Gwaunaru'u | Solomon Islands |
| AKT | Akrotiri | Akrotiri RAF | Cyprus |
| AKU | Aksu | Aksu | PR China |
| AKV | Akulivik | Akulivik | Canada |
| AKX | Aktyubinsk | Aktyubinsk | Kazakhstan |
| AKY | Sittwe | Sittwe Airport | Myanmar |
| ALA | Almaty | Almaty International Airport | Kazakhstan |
| ALB | Albany (NY) | Albany International Airport | USA |
| ALC | Alicante | El Altet Airport | Spain |
| ALD | Alerta | Alerta | Peru |
| ALE | Alpine (TX) | Alpine | USA |
| ALF | Alta | Alta | Norway |
| ALG | Algiers | Houari Boumedienne Airport | Algeria |
| ALH | Albany | Albany | Australia |
| ALI | Alice | Alice International Airport | USA |
| ALJ | Alexander Bay | Kortdoorn | South Africa |
| ALK | Asela | Asela | Ethiopia |
| ALL | Albenga | Albenga | Italy |
| ALM | Alamogordo (NM) | Municipal | USA |
| ALN | Alton (IL) | Alton | USA |
| ALO | Waterloo IA | Waterloo | USA |
| ALP | Aleppo | Aleppo International Airport (Nejrab Airport) | Syria |
| ALQ | Alegrete | Federal | Brazil |
| ALR | Alexandra | Alexandra | New Zealand |
| ALS | Alamosa (CO) | Municipal | USA |
| ALT | Alenquer | Alenquer | Brazil |
| ALU | Alula | Alula | Somalia |
| ALV | Andorra La Vella | Andorra La Vella H/P | Andorra |
| ALW | Walla Walla (WA) | Walla Walla | USA |
| ALX | Alexander City (AL) | Thomas C. Russell Field | USA |
| ALY | Alexandria | El Nouzha Airport (Alexandria International Airport) | Egypt |
| ALZ | Alitak (AK) | Alitak SPB | USA |
| AMA | Amarillo (TX) | Rick Husband Amarillo International Airport | USA |
| AMB | Ambilobe | Ambilobe | Madagascar |
| AMC | Am Timan | Am Timan | Chad |
| AMD | Ahmedabad | Sardar Vallabhbhai Patel International Airport | India |
| AME | Alto Molocue | Alto Molocue | Mozambique |
| AMF | Ama | Ama | Papua New Guinea |
| AMG | Amboin | Amboin | Papua New Guinea |
| AMH | Arba Mintch | Arba Mintch | Ethiopia |
| AMI | Mataram | Selaparang | Indonesia |
| AMJ | Almenara | Almenara | Brazil |
| AMK | Durango (CO) | Animas Airpark | USA |
| AML | Puerto Armuellas | Puerto Armuellas | Panama |
| AMM | Amman | Queen Alia International Airport | Jordan |
| AMN | Alma (MI) | Gratiot Community | USA |
| AMO | Mao | Mao | Chad |
| AMP | Ampanihy | Ampanihy | Madagascar |
| AMQ | Ambon | Pattimura | Indonesia |
| AMR | Arno | Arno | Marshall Islands |
| AMS | Amsterdam | Amsterdam-Schiphol | Netherlands |
| AMT | Amata | Amata | Australia |
| AMU | Amanab | Amanab | Papua New Guinea |
| AMV | Amderma | Amderma | Russia |
| AMW | Ames IA | Ames | USA |
| AMX | Ammaroo | Ammaroo | Australia |
| AMY | Ambatomainty | Ambatomainty | Madagascar |
| AMZ | Ardmore | Ardmore | New Zealand |
| ANA | Anaheim (CA) | Anaheim | USA |
| ANB | Anniston (AL) | County Airport | USA |
| ANB | Anniston (AL) | Metropolitan Area | USA |
| ANC | Anchorage (AK) | Ted Stevens Anchorage International Airport | USA |
| AND | Anderson (SC) | Anderson | USA |
| ANE | Angers | Marce | France |
| ANF | Antofagasta | Cerro Moreno International Airport | Chile |
| ANG | Angouleme | Brie-Champniers | France |
| ANH | Anuha Island Resort | Anuha Island Resort | Solomon Islands |
| ANI | Aniak (AK) | Aniak | USA |
| ANJ | Zanaga | Zanaga | Congo (ROC) |
| ANK | Ankara | Etimesgut | Turkey |
| ANL | Andulo | Andulo | Angola |
| ANM | Antalaha | Antsirabato | Madagascar |
| ANN | Annette Island (AK) | Annette Island | USA |
| ANO | Angoche | Angoche | Mozambique |
| ANP | Annapolis (MD) | Lee Airport | USA |
| ANQ | Angola (IN) | Tri-State Steuben City | USA |
| ANR | Antwerp | Antwerpen International Airport (Deurne) | Belgium |
| ANS | Andahuaylas | Andahuaylas | Peru |
| ANT | St. Anton | St. Anton | Austria |
| ANU | St. John's | V.C. Bird International Airport | Antigua and Barbuda |
| ANV | Anvik (AK) | Anvik | USA |
| ANW | Ainsworth (NE) | Ainsworth | USA |
| ANX | Andenes | Andenes | Norway |
| ANY | Anthony (KS) | Anthony | USA |
| ANZ | Angus Downs | Angus Downs | Australia |
| AOA | Aroa | Aroa | Papua New Guinea |
| AOB | Annanberg | Annanberg | Papua New Guinea |
| AOC | Altenburg | Altenburg Nobitz | Germany |
| AOD | Abou Deia | Abou Deia | Chad |
| AOE | Eskisehir | Anadolu University | Turkey |
| AOG | Anshan | Anshan | PR China |
| AOH | Liangping | Allen County | PR China |
| AOH | Lima (OH) | Allen County | USA |
| AOI | Ancona | Ancona Falconara Airport | Italy |
| AOJ | Aomori | Aomori | Japan |
| AOK | Karpathos | Karpathos | Greece |
| AOL | Paso De Los Libres | Paso De Los Libres | Argentina |
| AON | Arona | Arona | Papua New Guinea |
| AOO | Altoona (PA) | Martinsburg | USA |
| AOR | Alor Setar | Alor Setar | Malaysia |
| AOS | Amook (AK) | Amook | USA |
| AOT | Aosta | Corrado Gex | Italy |
| AOU | Attopeu | Attopeu | Lao PDR |
| APA | Denver (CO) | Arapahoe County - Centennial Airport | USA |
| APB | Apolo | Apolo | Bolivia |
| APC | Napa (CA) | Napa County | USA |
| APE | San Juan Aposento | San Juan Aposento | Peru |
| APF | Naples (FL) | Naples | USA |
| APG | Aberdeen (MD) | Phillips AAF | USA |
| APH | Bowling Green (VA) | Camp A P Hill | USA |
| API | Apiay | Apiay | Colombia |
| APK | Apataki | Apataki | French Polynesia |
| APL | Nampula | Nampula | Mozambique |
| APN | Alpena (MI) | Alpena County Regional | USA |
| APO | Apartado | Apartado | Colombia |
| APP | Asapa | Asapa | Papua New Guinea |
| APQ | Arapiraca | Arapiraca | Brazil |
| APR | April River | April River | Papua New Guinea |
| APS | Anapolis | Anapolis | Brazil |
| APT | Jasper (TN) | Marion County | USA |
| APU | Apucarana | Apucarana | Brazil |
| APV | Apple Valley (CA) | Apple Valley | USA |
| APW | Apia | Faleolo International Airport | Samoa |
| APX | Arapongas | Arapongas | Brazil |
| APY | Alto Parnaiba | Alto Parnaiba | Brazil |
| APZ | Zapala | Zapala | Argentina |
| AQA | Araraquara | Araraquara | Brazil |
| AQB | Quiche | Quiche Airport | Guatemala |
| AQG | Anqing | Anqing | PR China |
| AQI | Qaisumah | Qaisumah | Saudi Arabia |
| AQJ | Aqaba | King Hussein International Airport | Jordan |
| AQM | Ariquemes | Ariquemes | Brazil |
| AQP | Arequipa | Rodriguez Ballon International Airport | Peru |
| AQS | Saqani | Saqani | Fiji |
| AQY | Alyeska (AK) | Alyeska | USA |
| ARA | New Iberia (LA) | Acadiana Regional | USA |
| ARB | Ann Arbor (MI) | Municipal | USA |
| ARC | Arctic Village (AK) | Arctic Village | USA |
| ARD | Alor Island | Alor Island | Indonesia |
| ARE | Arecibo | Antonio/Nery/Juarbe Pol | Puerto Rico |
| ARF | Acaricuara | Acaricuara | Colombia |
| ARG | Argyle | Argyle International Airport | St. Vincent and the Grenadines |
| ARH | Arkhangelsk | Talagi Airport | Russia |
| ARI | Arica | Chacalluta International Airport | Chile |
| ARJ | Arso | Arso | Indonesia |
| ARK | Arusha | Arusha | Tanzania |
| ARL | Arly | Arly | Burkina Faso |
| ARM | Armidale | Armidale | Australia |
| ARN | Stockholm | Arlanda | Sweden |
| ARO | Arboletas | Arboletas | Colombia |
| ARP | Aragip | Aragip | Papua New Guinea |
| ARQ | Arauquita | Arauquita | Colombia |
| ARR | Alto Rio Senguerr | Alto Rio Senguerr | Argentina |
| ARS | Aragarcas | Aragarcas | Brazil |
| ART | Watertown (NY) | Watertown | USA |
| ARU | Aracatuba | Aracatuba | Brazil |
| ARV | Minocqua (WI) | Noble F. Lee | USA |
| ARW | Arad | Arad | Romania |
| ARX | Aracati | Dragao do Mar | Brazil |
| ARY | Ararat | Ararat | Australia |
| ARZ | N'Zeto | N'Zeto | Angola |
| ASA | Assab | Assab International Airport | Eritrea |
| ASB | Ashgabat | Ashgabat Airport | Turkmenistan |
| ASC | Ascension | Ascension | Bolivia |
| ASD | Andros Town | Andros Town International Airport | Bahamas |
| ASE | Aspen (CO) | Aspen-Pitkin County Airport | USA |
| ASF | Astrakhan | Astrakhan | Russia |
| ASG | Ashburton | Ashburton | New Zealand |
| ASH | Nashua (NH) | Boire Field | USA |
| ASI | Georgetown | Wideawake Field | St. Helena |
| ASJ | Amami Oshima Is | Amami-Oshima Airport | Japan |
| ASK | Yamoussoukro | Yamoussoukro | Cote d'Ivoire |
| ASL | Marshall (TX) | Harrison County | USA |
| ASM | Asmara | Asmara International Airport | Eritrea |
| ASN | Talladega (AL) | Talladega | USA |
| ASO | Asosa | Asosa | Ethiopia |
| ASP | Alice Springs | Alice Springs | Australia |
| ASQ | Austin (NV) | Austin | USA |
| ASR | Kayseri | Kayseri | Turkey |
| AST | Astoria (OR) | Astoria | USA |
| ASU | Asuncion | Silvio Pettirossi International | Paraguay |
| ASV | Amboseli | Amboseli | Kenya |
| ASW | Aswan | Aswan International Airport | Egypt |
| ASX | Ashland (WI) | Ashland | USA |
| ASY | Ashley (ND) | Ashley | USA |
| ASZ | Asirim | Asirim | Papua New Guinea |
| ATA | Anta | Anta | Peru |
| ATB | Atbara | Atbara | Sudan |
| ATC | Arthur's Town | Arthur's Town | Bahamas |
| ATD | Atoifi | Atoifi | Solomon Islands |
| ATE | Antlers (OK) | Antlers | USA |
| ATF | Ambato | Chachoan | Ecuador |
| ATG | Attock | Attock | Pakistan |
| ATH | Athens | Athens International Airport | Greece |
| ATI | Artigas | Artigas | Uruguay |
| ATJ | Antsirabe | Antsirabe | Madagascar |
| ATK | Atqasuk (AK) | Atqasuk | USA |
| ATL | Atlanta (GA) | Hartsfield-Jackson Atlanta Intl | USA |
| ATM | Altamira | Altamira | Brazil |
| ATN | Namatanai | Namatanai | Papua New Guinea |
| ATO | Athens (OH) | Ohio University | USA |
| ATP | Aitape | Aitape Airstrip | Papua New Guinea |
| ATQ | Amritsar | Sri Guru Ram Dass Jee International | Punjab, India |
| ATR | Atar | Atar Mouakchott | Mauritania |
| ATS | Artesia (NM) | Artesia | USA |
| ATT | Atmautluak (AK) | Atmautluak | USA |
| ATU | Attu Island (AK) | Casco Cove | USA |
| ATV | Ati | Ati | Chad |
| ATW | Appleton (WI) | Outagamie County | USA |
| ATX | Atbasar | Atbasar | Kazakhstan |
| ATY | Watertown (SD) | Watertown | USA |
| ATZ | Assiut | Assiut | Egypt |
| AUA | Aruba | Queen Beatrix Intl Airport | Aruba |
| AUC | Arauca | Arauca | Colombia |
| AUD | Augustus Downs | Augustus Downs | Australia |
| AUE | Abu Rudeis | Abu Rudeis | Egypt |
| AUF | Auxerre | Auxerre Branches | France |
| AUG | Augusta (ME) | Augusta | USA |
| AUH | Abu Dhabi | Abu Dhabi International | United Arab Emirates |
| AUI | Aua Island | Aua Island | Papua New Guinea |
| AUJ | Ambunti | Ambunti | Papua New Guinea |
| AUK | Alakanuk (AK) | Alakanuk | USA |
| AUL | Aur Island | Aur Island | Marshall Islands |
| AUM | Austin (MN) | Austin | USA |
| AUN | Auburn (CA) | Auburn | USA |
| AUO | Auburn (AL) | Auburn-Opelika | USA |
| AUP | Agaun | Agaun | Papua New Guinea |
| AUQ | Atuona | Atuona | French Polynesia |
| AUR | Aurillac | Aurillac | France |
| AUS | Austin (TX) | Austin-Bergstrom Intl | USA |
| AUT | Atauro | Atauro | Indonesia |
| AUU | Aurukun Mission | Aurukun Mission | Australia |
| AUV | Aumo | Aumo | Papua New Guinea |
| AUW | Wausau (WI) | Municipal | USA |
| AUX | Araguaina | Araguaina | Brazil |
| AUY | Aneityum | Aneityum | Vanuatu |
| AUZ | Aurora (IL) | Municipal Airport | USA |
| AVB | Aviano | Aviano | Italy |
| AVF | Avoriaz | Avoriaz | France |
| AVG | Auvergne | Auvergne | Australia |
| AVI | Ciego De Avila | Maximo Gomez | Cuba |
| AVK | Arvaikheer | Arvaikheer | Mongolia |
| AVL | Asheville (NC) | Hendersonville | USA |
| AVN | Avignon | Avignon-Caum | France |
| AVO | Avon Park (FL) | Municipal | USA |
| AVP | Scranton (PA) | Wilkes-Barre Intl | USA |
| AVU | Avu Avu | Avu Avu | Solomon Islands |
| AVV | Avalon | Avalon | Australia |
| AVW | Tucson (AZ) | Avra Valley | USA |
| AVX | Catalina Island (CA) | Avalon Bay | USA |
| AWA | Awassa | Awassa | Ethiopia |
| AWB | Awaba | Awaba | Papua New Guinea |
| AWD | Aniwa | Aniwa | Vanuatu |
| AWE | Alowe | Alowe | Gabon |
| AWH | Awareh | Awareh | Ethiopia |
| AWK | Wake Island | Wake Island | US Minor Outlying Is |
| AWM | West Memphis (AR) | Municipal (General Aviation) | USA |
| AWN | Alton Downs | Alton Downs | Australia |
| AWP | Austral Downs | Austral Downs | Australia |
| AWR | Awar | Awar | Papua New Guinea |
| AWZ | Ahwaz | Ahwaz | Iran |
| AXA | Anguilla | Wallblake | Anguilla |
| AXB | Alexandria Bay (NY) | Alexandria Bay | USA |
| AXC | Aramac | Aramac | Australia |
| AXD | Alexandroupolis | Demokritos Airport | Greece |
| AXE | Xanxere | Xanxere | Brazil |
| AXG | Algona IA | Algona | USA |
| AXK | Ataq | Ataq | Yemen |
| AXL | Alexandria | Alexandria | Australia |
| AXM | Armenia | El Eden | Colombia |
| AXN | Alexandria (MN) | Alexandria Municipal Airport | USA |
| AXP | Spring Point | Springpoint Airport | Bahamas |
| AXR | Arutua | Arutua | French Polynesia |
| AXS | Altus (OK) | Municipal | USA |
| AXT | Akita | Akita | Japan |
| AXU | Axum | Axum | Ethiopia |
| AXV | Wapakoneta (OH) | Neil Armstrong | USA |
| AXX | Angel Fire (NM) | Angel Fire | USA |
| AYA | Ayapel | Ayapel | Colombia |
| AYC | Ayacucho | Ayacucho | Colombia |
| AYD | Alroy Downs | Alroy Downs | Australia |
| AYE | Fort Devens (MA) | AAF Heliport | USA |
| AYG | Yaguara | Yaguara | Colombia |
| AYI | Yari | Yari | Colombia |
| AYK | Arkalyk | Arkalyk | Kazakhstan |
| AYL | Anthony Lagoon | Anthony Lagoon | Australia |
| AYN | Anyang | Anyang | PR China |
| AYO | Ayolas | Ayolas | Paraguay |
| AYP | Ayacucho | Yanamilla | Peru |
| AYQ | Ayers Rock | Connellan Airport | Australia |
| AYR | Ayr | Ayr Airport | Australia |
| AYS | Waycross (GA) | Ware County | USA |
| AYT | Antalya | Antalya Airport | Turkey |
| AYU | Aiyura | Aiyura | Papua New Guinea |
| AYW | Ayawasi | Ayawasi | Indonesia |
| AYZ | Amityville (NY) | Zahn's (closed in 1980) | USA |
| AZB | Amazon Bay | Amazon Bay | Papua New Guinea |
| AZD | Yazd | Yazd | Iran |
| AZG | Apatzingan | Apatzingan | Mexico |
| AZI | Abu Dhabi | Al Bateen Executive Airport | United Arab Emirates |
| AZN | Andizhan | Andizhan | Uzbekistan |
| AZO | Kalamazoo (MI) | Kalamazoo/Battle Creek International Airport | USA |
| AZP | Mexico City | Atizapan | Mexico |
| AZR | Adrar | Adrar | Algeria |
| AZS | El Catey | Samaná El Catey International Airport | Dominican Republic |
| AZT | Zapatoca | Zapatoca | Colombia |
| AZZ | Ambriz | Ambriz | Angola |