Alturas Municipal Airport (ICAO: KAAT, FAA LID: AAT formerly O00), is a city-owned public-use airport located one nautical mile (1.85 km) west of the central business district of Alturas, a city in Modoc County, California, United States. This airport is included in the FAA's National Plan of Integrated Airport Systems for 2009–2013, which categorizes it as a general aviation facility.

Although most U.S. airports use the same three-letter location identifier for the FAA and IATA, Alturas Municipal Airport is assigned AAT by the FAA but has no designation from the IATA (which assigned AAT to Altay Airport in Altay, Xinjiang, China).