David is correct, a lot of the in-state air traffic in Alaska carries cargo first and passengers second. I’m not sure how many, but some of the 737s used up there have the passenger area walled off to allow more cargo room on the upper deck. Flights to the north slope usually had 15-20 passengers in a small cabin area and the rest was full of freight. Towns down the coast toward Juneau are accessible only by boat or air.