Planes carry transponders that transmit their real-time location. The Alaska plane stopped sharing that data on Thursday.

The disappearance marks the third major incident in U.S. aviation in eight days. The Bering Air Caravan, a single-engine turboprop, was heading from Unalakleet to Nome.

Searchers flew over stretches of ice-covered seas and scoured miles of frozen tundra Friday for any sign of a plane that went missing while carrying 10