Help ID Piedmont Propeller Planes, Please

From: (John Witherspoon)
Date:         6 Dec 1996 16:34:31 GMT
Organization: The American University
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In the mid to late 1970s, Piedmont Airlines flew propeller planes into
Myrtle Beach, South Carolina's airport, which was not at the time (and is
not presently) equipped for commercial jets (jet traffic into MYB started
soon thereafter, when all commercial flights were moved to the civilian
terminal of the Myrtle Beach Air Force base).
Can anyone shed any light on what type of planes these prop transports
might have been?  If memory serves, they were large, four engine planes,
i.e. bigger than, say, Convair 580s.