Ozark in the latter part of the 1950s. They were strictly DC-3 and SUPER DC-3, with doors which covered the main landing gear in flight.
Stewardesses who looked like they milked the cows before coming to work - well-fed farm girls.
Ramp workers at Midway who looked as though they carried switch-blade knives.
At Peoria the same person checked you in and pushed the cart containing the baggage out to the plane.
They later got modern with F-27s and DC-9s and expanded to cover from Denver to NYC. Their sales motto at the time was "Two-thirds transcontinental". Then TWA took them over.