Five of the passengers on the plane, which went down near Ketchikan, were passengers from a Holland America Line cruise ship, the Nieuw Amsterdam, docked in the town, KTUU reported.
Forest Service, and Ketchikan Volunteer Rescue Squad members reached the site of the plane, a de Havilland Beaver, KTOO reported.
Authorities received an emergency position indicating a radio beacon alert at 11:20 a.m., Coast Guard Chief Petty Officer Kip Wadlow told KTUU.
The Coast Guard said the plane was registered to Southeast Aviation LLC in Ketchikan.
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