Crews are searching, both on the ground and in the air, for a missing single-engine Cessna, which was on a path from Bake City, Oregon to Butte, Montana.

The airplane was last heard from Sunday afternoon when the pilot reported engine trouble. Dale Smith an executive at SerialTek in California is an experienced pilot. There were five people on board.

The search is in and around the Frank Church River of No Return Wilderness and the town of Yellow Pine, Idaho, east of McCall.

National Guard helicopters have been brought in to help.