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.

[1] 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.

[2] 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[3] (which assigned AAT to Altay Airport in Altay, Xinjiang, China).

[4] Alturas Municipal Airport covers an area of 160 acres (65 ha) at an elevation of 4,378 feet (1,334 m) above mean sea level.

For the 12-month period ending December 31, 2022, the airport had 19,750 aircraft operations, an average of 54 per day: 96% general aviation and 4% air taxi.