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).

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 4,228 by 50 feet (1,289 x 15 m) and 3/21 is 2,506 by 60 feet (764 x 18 m).

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.

• Aerial image as of 25 August 1998 from USGS The National Map
• FAA Terminal Procedures for AAT, effective September 5, 2024
• Resources for this airport:
  • FAA airport information for AAT
  • AirNav airport information for KAAT
  • FlightAware airport information and live flight tracker
  • NOAA/NWS weather observations: current, past three days
  • SkyVector aeronautical chart, Terminal Procedures