Spain's port operator AENA says that an Air Canada Boeing 767 aircraft is to make an emergency landing at the airport in Madrid Monday after reporting technical problems.
The Toronto-bound flight AC837 departed from the Adolfo Surez-Barajas international airport earlier in the day.
An AENA spokeswoman said that the airline had requested a slot for an emergency landing some 30 minutes after the takeoff. The official, who was not authorised to be named in media reports, said the she couldn't elaborate.
Spain's main union of pilot workers, SEPLA, said in a tweet that the plane lost some pieces of its landing gear during takeoff and that the aircraft needs to fly in circles to burn off fuel before landing.
Citing airport sources, Spain's El Mundo newspaper reported that the plane is carrying 130 passengers and that it lost a wheel during takeoff.
Madrid residents posted videos online showing a plane flying unusually low over the Spanish capital's center and suburbs.