https://dailyhive.com/montreal/montreal-trudeau-international-airport-yul-expansion-rem-train
https://www.admtl.com/en-CA/corporate/about-us/future-projects
https://en.wikipedia.org/wiki/YUL%E2%80%93A%C3%A9roport-Montr%C3%A9al%E2%80%93Trudeau_station
https://www.admtl.com/en-CA/parking-and-transport/roadworks
https://www.cbc.ca/news/canada/montreal/yul-trudeau-airport-10-billion-transformation-1.7586489
Eventually, the Pierre+Elliott+Trudeau+International+Airport could have 3 long runways. Fortunately, there is enough clearance to lengthen the shortest runway.
https://www.admtl.com/en-CA/community/soundscape-management/construction-on-runways-and-taxiways
Orly_Airport has 3 runways.
Sea-Tac also has 3 runways, but are all parallel.
https://en.wikipedia.org/wiki/Seattle-Tacoma_International_Airport
Heathrow_Airport has 2 very long runways.
https://en.wikipedia.org/wiki/Heathrow_Airport#Future_expansion_and_plans
Charles_de_Gaulle_Airport has 2 very long runways, plus 2 of moderate length.