CODY, Wyo. -

 It may be months before search and rescue members can reach a single-engine plane that crashed on a mountain in northwest Wyoming.

The two elderly brothers from Alabama and Washington were on board the aircraft. They are presumed dead based on aerial views of the crash site on a rugged, snow-covered mountain just outside Yellowstone National Park.

The Park County Sheriff's Office says the danger of avalanche makes it too risky to put people on the ground to recover the bodies and the plane.

Sheriff's Office spokesman Lance Mathess says it could be two weeks or two months before the avalanche danger ends and the deep snow melts enough to allow recovery.

The brothers were headed from Cody to Twin Falls, Idaho, and then to Seattle.