What: Air Canada Boeing 777 en route from Vancouver to Toronto
Where: Vancouver International Airport
When: Dec 16, 2010
Who: 224 passengers
Why: While en route, the Boeing developed an oil pressure problem (indicator) in one of the engines. No smoke was reported.
The pilots returned to Vancouver and made a safe landing. No injuries were reported. Passengers disembarked and boarded another plane which left for Toronto around noon.

Ryanair flight FR-6579 had to reject takeoff from Palma de Mallorca Airport, Spain, on April 22nd.
United Airlines flight UA-1418 made an emergency landing in Calgary, Canada, on October 13th.
Turkish Airlines flight TK-322 had to return and make an emergency landing in Istanbul, Turkey, on April 2nd.
United Airlines flight UA-2 made an emergency landing at Narita International Airport, Japan, on November 28th.