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. It has two asphalt paved runways: 13/31 is 4,300 by 50 feet (1,311 x 15 m) and 3/21 is 3,096 by 60 feet (944 x 18 m). For the 12-month period ending December 31, 2008, the airport had 31,500 aircraft operations, an average of 86 per day: 95% general aviation and 5% air taxi.^[1]