I think they would be better off trying to open the emergency door in flight or something(if that is possible).
Nope not possible due to the doors opening inward and the plane being pressurized. Even if you could get the door open, most people do not know how cold it is at altitude.
When I fly on the a KC-135, I have to be carefull on where I place my drink. I have had them freeze almost solid in less than an hour before. This is with a pressurized cabin and some "heat" being on!