Never underestimate a bureaucracies absolutism when it comes to following its own rules:
As the plane was preparing to take off for a second time and depart from the Great White North, the aircraft ran into a mechanical issue. Natalie Noonan, a United Airlines spokeswoman, told Global News that the door of the aircraft wouldn’t shut because it had likely frozen in the frigid temperatures.
However, because the airport had no customs officers on duty overnight, passengers were unable to leave the plane.
[…]
As the hours ticked away, temperatures continued to drop, sinking to as cold as -26 degrees Fahrenheit around 8 a.m. AST in Goose Bay, according to Weather Underground data.
I’m sure United Airlines is relieved to not be the source of the problem. However, I’m doubting the passengers sitting on a plane with a door that wouldn’t close in subzero weather were seeing the wisdom of barring them from deplaning because a bureaucrat wasn’t present to process their papers.