This promotional film from the late 1960s was made by Intermountain Aviation Inc, a US based charter and specialty operator that was active from their launch in the late 1960s until their 1975 purchase by Evergreen International in 1975.
As evidenced in this film. Intermountain was an active charter operator working in Alaska to support oil exploration of the day. They operated an interesting fleet including DHC-6 Twin Otter, C-46 Commando, DC-6, Bell 206 Jet Ranger, and the Pilatus Porter all of which appear in the film.
Other aircraft which do not appear in the film but were still operated by Intermountain during their existence include the L-188 Electra, DHC-4 Caribou, and Boeing B-17.
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