Montréal–Pierre Elliott Trudeau International Airport

Montréal–Pierre Elliott Trudeau International Airport (IATA: YUL, ICAO: CYUL) (French: Aéroport international Pierre-Elliott-Trudeau de Montréal) or Montréal–Trudeau, formerly known as Montréal–Dorval International Airport) is a Canadian airport located on the Island of Montreal, 20 km (12 mi) from Montreal's downtown core. The airport terminals are located entirely in Dorval, while the Air Canada headquarters complex and one runway is located in Saint-Laurent, Montreal. It is an international airport serving Greater Montreal, along with the regions of northern Vermont and New York.

The airport is one of two managed and operated by Aéroports de Montréal (ADM), a not-for-profit corporation without share capital; the other airport is Montréal–Mirabel northwest of Montreal, which was initially intended to replace the one in Dorval but now deals almost solely with cargo. Montréal–Trudeau is owned by Transport Canada, which has a 60-year lease with Aéroports de Montréal, as per Canada's National Airport Policy of 1994.

Trudeau is the busiest airport in the province of Quebec, the third busiest airport in Canada by passenger traffic and fourth busiest by aircraft movements, with 13,668,829 passengers and 230,922 movements in 2011. It is one of eight Canadian airports with United States border preclearance and is one of the main gateways into Canada with 8,436,165 or 61.7% of its passengers being on non-domestic flights, the highest proportion amongst Canada's airports during 2011. It is one of four Air Canada hubs, and, in that capacity, serves mainly Quebec, the Atlantic Provinces and Eastern Ontario. The air route between YUL and Toronto Pearson International Airport is currently the 14th busiest air route in the world, in terms of flights per week, while the air route between YUL and Paris-Charles de Gaulle is the 8th busiest in terms of passengers carried (1.1 million) between Europe and a non-European destination.

Airlines servicing Trudeau offer flights to Africa, Western Asia, the Caribbean, Central America, South America, Europe, Mexico, the United States, and other destinations within Canada. The airport is headquarters and large Hub for Air Canada, the country's largest airline, charter airlines, Air Inuit, Air Transat and Sunwing Airlines. It also serves as a base of operations for CanJet. It also plays a role in general aviation as home to the headquarters of Innotech-Execair, Starlink, ACASS and Maintenance Repair & Overhaul (MRO) facilities of Air Canada, Air Transat, MJet and ExcelTech. Transport Canada operates a Civil Aviation Maintenance, Repair and Overhaul facility on site, with a fleet of Government owned and operated civil aircraft. Bombardier Aerospace has an assembly facility on site to build regional jets and Challenger business jets.