This post card was printed in 1950, as shown by the Curt Teich date code. On the apron are DC-3s from American Airlines and Piedmont. American would fly away from the airport two years later, but Piedmont would hang in there for the duration.
This Haynes Distributing Company postcard shows two aircraft sitting on the tarmac: a Fairchild F-27, which Piedmont flew from 1958 to 1967, on the left; and the tail portion of a DC-3, which Piedmont took out of service in 1963.
Since Joyce L. Haynes, the photographer, was undoubtedly an efficient person, I think she took all four of these photographs around the summer of 1962.
I have a number of cards published by Haynes (and printed by Dexter). I think there were at least two series of cards done: the earlier ones with photos taken by Joyce L. Haynes and a later series with photography by C. H. Ruth.
I also think Ms Haynes had a knack for choosing days with brilliant blue skies and fluffy white clouds (The Orb!).
Bob Lawrence's Kingsport 