It’s often said that the safest place to sit in a plane is at the back — and the only survivors of the recent Azerbaijan Airlines and Jeju Air crashes were in the rear of the plane. But, say safety experts,

Investigators assessing the survivability of a plane crash focus on five factors: integrity of the aircraft, effectiveness of safety restraints, G-forces experienced by passengers and crew, the environment inside the aircraft and postcrash factors such as fire or smoke.