managed to open the door to the plane but the drop to the tarmac was steep. she was eventually rescued by ground crew. this passenger rights advocate says this is a rare occurrence but it raises serious security concerns. >> if this would have happened with someone else who may have different intentions, injury could have resulted. the passenger had access to the cockpit and could have hypothetically turned on the aircraft. that would not have been a great thing to happen, to say the very least. >> reporter: air canada confirms the incident. the passenger was left on the aircraft after the flight and the aircraft had been parked. air canada is investigating but won't provide details. o'brien has hired a lawyer. >> just never heard anything like that. of course thanks to ctv's janet dirks for that report. wow. >> hope that's an isolated incident. >> let's hope so for sure. still ahead here, cities around the world are asking