WestJet is the first Canadian airline to bring the 737 MAX 8 aircraft, grounded for nearly two years after devastating twin crashes.

The airline says the pilots of the "repositioning flight" between Marana, Ariz., and Montreal shut down one engine after noticing the warning and were redirected to Tucson.

A Boeing official said the debris was discovered in “several” planes but did not give a precise number.

Analysts had predicted that Boeing might try to announce some MAX orders at the air show to demonstrate that the plane still has support.

FAA and Boeing representatives briefed members of the International Civil Aviation Organization's governing council in Montreal on Thursday on efforts to return the plane to service.

The country's largest airline has prolonged leases for three Airbus A320s and three Embraer E190s — both fuel-guzzlers compared to the MAX 8.

Canada's largest airlines have had to make a number of adjustments to their schedules in order to accommodate the grounding of Boeing 737 MAX 8 aircraft.

UBC aviation professor Tae Hoon Oum said airlines will take advantage of the increased demand caused by the grounding.

Both Air Canada and WestJet say they shifted planes to focus on north-south routes as travellers return from vacations in Mexico and the Caribbean.