Background

In the 1960s, Montreal experienced a tremendous economic boom. Massive construction projects, including the Montreal Metro and those linked with the hosting of Expo 67, brought the city international status. More and more visitors were arriving to the city, especially by airplane but not always by choice. The federal government required European airlines to make Montreal their only Canadian destination. That resulted in 15–20% annual growth in passenger traffic at the city's Dorval Airport. As noise levels rose due to the increased flights, a nighttime restriction on flights was imposed as a temporary measure to placate nearby residents, but this would not be a long-term solution. At the time runway expansion at Dorval would have required the expensive acquisition of land.

Optimistic about the city's future and its continuing ability to attract more and more visitors, government officials decided to build a new airport that would be more than able to absorb increased passenger traffic well into the 21st century.

The Canadian Department of Transport studied five possible sites for Montreal's new airport: Saint-Jean-sur-Richelieu (50 km (31 mi) to the southeast), Vaudreuil-Dorion (40 km (25 mi) to the west), Joliette (70 km (43 mi) to the north), St-Amable (30 km (19 mi) to the southeast), and Ste-Scholastique (60 km (37 mi) to the northwest).

The federal government proposed that the airport should be located at Vaudreuil-Dorion. Not only was it well served by existing road and rail routes, but it was close enough to both Ottawa and Montreal to serve as the gateway for both cities. However, Quebec Premier Robert Bourassa, who had a frosty relationship with Prime Minister Pierre Trudeau, reportedly did not want such an important project to be placed so close to the provincial border fearing the exodus of airport workers to Ontario. The Bourassa government preferred that the new airport be situated in Drummondville (100 km (62 mi) to the east) where it could be a gateway to Quebec City as well as Montreal.

Expropriation

In March 1969, the federal and provincial governments reached a compromise to locate at the St. Scholastique site, and proposals were drawn up to expropriate 39,250 hectares (97,000 acres), an area larger than the entire city of Montreal. This area is served only by a long road link via Autoroute 15 and Autoroute 50. An additional link via Autoroute 13 was planned but never completed. Also planned was the connection of Autoroute 50 to the Ottawa/Gatineau area, a goal which would not be achieved until decades later, in 2012.

The federal government expropriation resulted in making Mirabel the world's largest airport by property area. The airport's planned operations zone, which encompassed what was eventually built plus expansion room, amounted to only 6,880 hectares (17,000 acres), about 19% of the total area of the property. The federal government planned to use the excess land as a noise buffer and as an industrial development zone (which was never started). This attracted the ire of the people of St. Scholastique who protested vehemently against the expropriation of their land. Nevertheless, construction started in June 1970 under the auspices of BANAIM, a government organization formed to build the airport. The architects charged with the design were Papineau, Gérin-Lajoie, LeBlanc, Edwards.

Urban rail transit – the system was to be capable of speeds from 100 to 120 kilometres per hour (62 to 75 mph) for the Montréal–Mirabel run – initially to be called TRRAMM (Transport Rapide Régional Aéroportuaire Montréal–Mirabel), was intended to be completed at a later date. However, it never got beyond the drawing board. The TRRAMM system was also intended to eventually be expanded to other parts of the Montreal region. The major stumbling block for the TRRAMM project was funding. The federal, provincial, and municipal governments never managed to find enough cash to fund the highly ambitious and expensive rapid transit project. Thus, Mirabel was forced to cope with an inadequate road system and non-existent rail transit, supplemented only by express buses.