Ten PA-4s were built before it was re-engined with the Wright J-5 Whirlwind as the Pitcairn PA-5 to fly on the CAM-19 mail routes.

The Fleetwing II is a conventional landing gear equipped biplane with strut-braced tail surfaces.

In 1928, the Fleetwing II The City of Reading participated in the Transcontinental Air Race.

[2] The sole remaining Fleetwing II was rebuilt over the course of seven years by Harold Armstrong from drawings supplied by Steve Pitcairn (1925-2008), son of company founder Harold Frederick Pitcairn (1897-1960).

The aircraft won Grand Champion Antique at the 1991 EAA AirVenture Oshkosh airshow.