Rescuers searched Friday for any sign of a plane that went missing while carrying 10 people across Alaska´s Norton Sound south of the Arctic Circle. The Bering Air Caravan, a single-engine turboprop, was heading from Unalakleet to Nome on Thursday afternoon with nine passengers and a pilot, according to Alaska’s Department of Public Safety. Authorities were working to determine its last known coordinates. Unalakleet is a community of about 690 people in western Alaska, about 150 miles (about 240 kilometers) southeast of Nome and 395 miles (about 640 kilometers) northwest of Anchorage. The disappearance marks the third major incident in U.S. aviation in eight days. A commercial jetliner and an Army helicopter collided near the nation´s capital on Jan. 29, killing 67 people. A medical transportation plane crashed in Philadelphia on Jan. 31, killing the six people onboard and another person on the ground. The Cessna Caravan left Unalakleet at 2:37 p.m., and officials lost contact with it less than an hour later, according to David Olson, director of operations for Bering Air. The aircraft was 12 miles (19 kilometers) offshore, the U.S. Coast Guard said. It was operating at its maximum passenger capacity, according to the airline´s description of the plane.