The film crew designed a special camera rig and mounted it to the side of the Airbus A400m airplane with the camera pointed back at where Cruise would be. It was mounted securely to ensure that it wouldn’t break off and fly into the actor’s body.
In an interview with Yahoo Movies UK, Cruise says that one of the biggest concerns was about flying particles and bird strikes — at takeoff speeds, even small objects could injure or kill Cruise. The actor also wore special contact lenses that protected his eyes from tiny particles and the intense “hard air.”
Source: PetaPixel