Rocky Mountain "Scareways" and AvonSTOLPort live only in distant memory now, way back when they and (the REAL) Frontier Airlines used to fly of all things, the Twin Otter.
I lived west of Stapleton on a straight line with Runway 26 L/R, and I'd hear 'em fly over the house with the unmistakable roar of their PT6's; much different than the Heavy Iron using 26L.