Slight correction....I did not see any Fokker F-100 series, only Fokker F-28-400 series. One of the primary differences between the F-100 and it's smaller brother the F-28, is the size of the motors. Hence Fokker pilots all fly either "big motor Fokkers", or "little motor Fokkers."
The F-100 was originally purchased by US Airways and came to that fleet. It was never operated by Piedmont independently, only after the 1987 Piedmont / US Air merger.