Montreal-Pierre Elliott Trudeau International Airport is the busiest airport in the province of Quebec and the third busiest airport in Canada. The airport has three runways of 11,000ft (3.4km), 9,600ft (2.9km), and 7,000ft (2.1km). It has five Fixed Based Operators and handling agents, four of which operate 24 hours a day. Customs clearance is available and it is 1 of 8 airports in Canada with US border preclearance. Airport slots are not required for landing or departure. The airport has several VIP lounges and is located 18km northwest of downtown Montreal.