Ottawa/Macdonald–Cartier International Airport or Macdonald–Cartier International Airport (French: L'aéroport international Macdonald-Cartier) (IATA: YOW, ICAO: CYOW) is the main international airport serving Ottawa, Ontario, Canada, and its metropolitan area known as the National Capital Region. It is named after the Canadian statesmen and two of the "founding fathers of Canada", Sir John A. Macdonald and Sir George-Étienne Cartier. Located 5.5 nautical miles (10.2 km; 6.3 mi) south of downtown Ottawa in the south end of the city, it is Canada's seventh-busiest airport, Ontario's second-busiest airport by airline passenger traffic, with 1,170,789 passengers in 2021. The airport was the home base for First Air.