"In 1989, Piedmont merged into USAir and Henson planes were repainted to reflect the new identity of USAir Express. In 1993, Henson was renamed Piedmont Airlines in order to preserve the Piedmont identity within the USAir Group family." Source is piedmont airlines website under "our history"
The piedmont you’re talking about was Henson Airlines. The piedmont Donald is talking about is the original Piedmont. 2 different airlines. Weight issues is an aircraft specific issue, not Piedmont’s fault. As for whether or not they can delay flights for connecting passengers, that is ultimately up to American mainline, not piedmont.