There have been cases of a very small number of survivors in very serious accidents, but it is "very rare" for there to be only one, a professor told Newsweek.

AHMEDABAD, India — The Air India plane crash this week was one of India’s worst aviation disasters, killing 241 people on board and several people on the ground. Indian authorities said Friday the investigation into the crash was underway and is expected to include experts from the plane’s maker Boeing and U.S. aviation regulators.