[2] Aecon has been involved in the building of some of Canada's landmarks, including the CN Tower, St. Lawrence Seaway, Ontario Highway 407, Vancouver Skytrain, and the Montreal-Trudeau International Airport.

[3] Aecon's history began in 1867, when Scottish immigrant Adam Clark started a plumbing and gas fitting business in Hamilton, Ontario.

[9] Aecon Infrastructure is responsible for the design and construction of large transportation projects, including airport terminals, highways, hydroelectric dams, subway tunnels and utility corridors.

[13] In October 2024, Aecon Group buys United Engineers & Constructors for US$33 million in order to enhances North American nuclear capability.

[15][16] Prior to this, Aecon was fined $225,000 (CAD) in 2011 after being judged liable for a 2008 natural gas explosion that killed a homeowner in an Ontario town.