Passengers said the cabin seemed "noisier and colder than they were used to." That's when a crew member noticed a window seal flapping at the back of the aircraft.

A U.S.-bound plane took off from London last month with four damaged window panes, including two that were completely missing, according to U.K. air accident investigators.

No one was injured by the window malfunctions, which appear to have been caused by high-power lights used in a film shoot, the U.K.’s Air Accident Investigation Branch reported in a special bulletin published Nov. 4.