Rhone Baumgartner and Kameron Hartvigson had travelled to Unalakleet to service a heat recovery system vital to the community's water plant, according to the Alaska Native Tribal Health Consortium.

The missing aircraft's last position over water was tracked 38 minutes after departing Unalakleet, Alaska at 2.38 pm local time Thursday (2338 GMT). A small commercial aircraft carrying 10 people ...