In 1957, newspaper publisher David Lindsay (1922–2009) founded Trans Florida Aviation Inc. His intention was to transform surplus military P-51s into executive business aircraft.

The airframes were completely disassembled, the military equipment stripped out, and then rebuilt with a second seat, new avionics, plush leather interiors, luggage bays, and civilian paint schemes.

Several FAA approved modifications to the Cavalier design would be made during that time, including canopy frame mounted cockpit fresh air vents, 96-US-gallon (360 L; 80 imp gal) wingtip fuel tanks, fuselage baggage door, 60 gallon ammo/gun bay fuel tanks, autopilot and a 14-inch (360 mm) taller vertical stabilizer.

Despite numerous sales presentations to the United States Air Force, neither the U.S. military nor any foreign operators purchased the Turbo Mustang III.

Seeking a company with mass production capability, the Turbo Mustang project, now called "The Enforcer," was sold by Lindsay to Piper Aircraft in 1971.

Lindsay set up a new company, Field Services Inc., to complete a USAF Cavalier Mustang II contract, called "Peace Pony", for Indonesia.