WATCH: Air Canada flight loses wheel during Montreal takeoff

An Air Canada flight from Montreal to Heathrow on Sunday lost one of its rear landing gear wheels before takeoff... and nobody noticed.

Flight AC864 was flying out of Trudeau Airport Sunday night with 294 passengers on board an Air Canada Airbus A330 when one of the 8 wheels on its rear landing gear fell off.

No one noticed, including the pilot, and the plane was able to take off and land in Heathrow without any problems. 

Air Canada spokesperson Isabelle Arthur tells CJAD that the wheel "came to rest beside the runway" but because "the landing gear is comprised of 8 wheels, this had no impact on the safe operation of the flight."

Passengers on the returning flight were re-booked on other flights later while the aircraft is being repaired.