Air Canada isn't saying how a sleeping passenger could have been missed by the flight crew after a flight to Toronto, leaving the woman to wake up alone on a cold, dark aircraft. 

Tiffani Adams's story was posted by a friend on Air Canada's Facebook page. Adams says that her phone died and she couldn't charge it because power to the plane had been turned off.

She says she was able to flag a member of the ground crew to rescue her after she managed to unbolt a cabin door and lean out of the aircraft.

The airline says it is very concerned to hear the woman's story, and is investigating the matter.