Important airports in the province include Toronto Pearson International Airport, which is the busiest airport in Canada, handling nearly 50 million passengers in 2018. Ottawa Macdonald–Cartier International Airport is Ontario's second largest airport. Toronto/Pearson and Ottawa/Macdonald-Cartier form two of the three points in Canada's busiest set of air routes (the third point being Montréal–Pierre Elliott Trudeau International Airport). In addition to airports in Ottawa, and Toronto, the province also operates three other international airports, the John C. Munro Hamilton International Airport in Hamilton, the Thunder Bay International Airport in Thunder Bay and the London International Airport in London. John C. Munro Hamilton International Airport serves as cargo hub, reliever for Pearson, and a hub for ULCC Swoop.