Cancelled order for Piedmont Airlines. First flew as N1790B in 1970. To Mey-Air as LN-MTC in 1971 then to Piedmont Airlines as N753N in 1974. Reregistered as N220US in 1988 and merged into US Air in 1989. To Eastwind Airlines in 1995. Withdrawn from use at Greensboro, NC in 1999 and scrapped in 2000.