[list of airports by iata code: a \- A] - AT
- ATA (KATA) – Hall-Miller Municipal Airport – Atlanta, Texas, United States
- ATA (SPHZ) – Comandante FAP German Arias Grazziani Airport – Anta Huaraz, Peru
- ATB (HSAT) – Atbara Airport – Atbara, Sudan
- ATC (MYCA) – Arthurs Town Airport – Arthurs Town, Cat Island, Bahamas
- ATD – Atoifi Airport – Atoifi, Solomon Islands
- ATF (SEAM) – Chachoan Airport – Ambato, Ecuador
- ATG (SPAY) – Atalaya Airport – Atalaya, Peru
- ATG – Attock Airport – Attock, Pakistan
- ATH (LGAV) – Eleftherios Venizelos International Airport (succeeded Ellinikon International Airport) – Athens, Greece
- ATI (SUAG) – Artigas International Airport – Artigas, Uruguay
- ATJ (FMME) – Antsirabe Airport – Antsirabe, Madagascar
- ATK (PATQ) – Atqasuk Edward Burnell Sr. Memorial Airport – Atqasuk, Alaska, United States
- ATL (KATL) – Hartsfield-Jackson Atlanta International Airport – Atlanta, Georgia, United States
- ATM (SBHT) – Altamira Airport – Altamira, Pará, Brazil
- ATN – Namatanai Airport – Namatanai, Papua New Guinea
- ATP – Aitape Airstrip – Aitape, Papua New Guinea
- ATQ (VIAR) – Raja Sansi International Airport – Amritsar, India
- ATR (GQPA) – Mouakchott Airport – Atar, Mauritania
- ATS (KATS) – Artesia Municipal Airport – Artesia, New Mexico, United States
- ATU (PATU) – Casco Cove Coast Guard Station – Attu Island, Alaska, United States
- ATV (FTTI) – Ati Airport – Ati, Chad
- ATW (KATW) – Outagamie County Regional Airport – Greenville, Wisconsin (near Appleton), United States
- ATX – Atbasar Airport – Atbasar, Kazakstan
- ATY (KATY) – Watertown Regional Airport – Watertown, South Dakota, United States
- ATZ (HEAT) – Assiut Airport – Assiut, Egypt
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