By 1954, Howard had decided that the next step for corporate aircraft (which were mostly Twin Beeches and DC 3s at the time) was faster, farther ranging machines like his modification of the Lockheed PV 1 Ventura.
Howard introduced the Super Ventura, which led to development of the Howard 250, the 350, and culminated in the Howard 500.
In 1964 Business AirCraft Corp (successor to Howard Areo) announced sale of the first BA 400 pressurised Super Ventura. It cruised at 350 mph at 21,000 ft with a useful load of 10,100 lb. It was the only pressurised plane in production available for $550,000.
All Aero 