[list of airports by iata code: a \- A] - AS
- ASA (HHSB) – Asseb International Airport – Asseb, Eritrea
- ASB (FASB) – Springbok Airport – Springbok, Northern Cape, South Africa
- ASB (UTAA) – Ashgabat_Airport – Ashgabat, Turkmenistan
- ASC (SLAS) – Ascension de Guarayos Airport – Ascension de Guarayos, Bolivia
- ASD (KASD) – Slidell Airport – Slidell, Louisiana, United States
- ASD (MYAF) – Andros Town International Airport – Andros Island, Bahamas
- ASE (KASE) – Aspen-Pitkin County Airport – Aspen, Colorado, United States
- ASF (URWA) – Astrakhan Airport – Astrakhan, Russia
- ASG (NZAS) – Ashburton Airport – Ashburton, New Zealand
- ASH (KASH) – Boire Field – Nashua, New Hampshire, United States
- ASI (FHAW) – Wideawake Field – Georgetown, Ascension Island, Saint Helena
- ASJ (KASJ) – Tri-County Airport – Ahoskie, North Carolina, United States
- ASJ (RJKA) – Amami O Shima Airport – Amami Island, Japan
- ASK (DIYO) – Yamoussoukro Airport – Yamoussoukro, Ivory Coast
- ASL (KASL) – Harrison County Airport – Marshall, Texas, United States
- ASM (HHAS) – Asmara International Airport – Asmara, Eritrea
- ASN (KASN) – Talladega Municipal Airport – Talladega, Alabama, United States
- ASO (HASO) – Asosa Airport – Asosa, Ethiopia
- ASP (YBAS) – Alice Springs Airport – Alice Springs, Northern Territory, Australia
- ASR (LTAU) – Erkilet International Airport – Kayseri Province, Turkey
- AST (KAST) – Astoria Regional Airport – Astoria, Oregon, United States
- ASU (SGAS) – Silvio Pettirossi International Airport – Asunción, Paraguay
- ASV (HKAM) – Amboseli Airport – Amboseli, Kenya
- ASW (KASW) – Warsaw Municipal Airport – Warsaw, Indiana, United States
- ASW (HESN) – Aswan International Airport – Aswan, Egypt
- ASX (KASX) – John F. Kennedy Memorial Airport – Ashland, Wisconsin, United States
- ASY (KASY) – Ashley Municipal Airport – Ashley, North Dakota, United States
- ASZ – Asirim Airport – Asirim, Papua New Guinea
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