Densely populated areas are located around airports in many cities and Thursday's Ahmedabad plane crash, in which at least 30 people were killed on the ground as well, has got residents worried about a tragedy like that hitting closer home.

Air India flight AI171, a Boeing 787-8 carrying 242 people, crashed after taking off from Ahmedabad on its way to London.

The only known surviving passenger was in seat 11A, next to an emergency exit, said Vidhi Chaudhary, a top state police officer, adding that there could be more survivors in hospital.