10/31/2007. Remarks by Johan Visschedijk: "The Jet Squalus was designed by Dott Ing Stelio Frati of General Avia (Pioltello, Italy) for Promavia (Gosselies-Aéroport, Belgium) according the NGT (Next Generation Trainer) specifications of the USAF. The single-engined jet aircraft was built by General Avia and the prototype was flown for the first time registered as I-SQAL by Jack Zanasso from Aeroporto di Orio al Serio, Bergamo, Milan, on April 30, 1987. A second airframe (OO-JET) has been built but was never flown.

The prototype was transferred to Gosselies and eventually reregistered as OO-SQA. Hundreds of test and demonstration flights produced much attention, the original 1,330 lb (603 kg) st Garrett TFE-109-1 turbofan was replaced by an 1,800 lb (816 kg) st Williams FJ-44 turbofan, however no production was undertaken.

Alberta Aerospace eventually acquired all assets of the Jet Squalus program and the aircraft was registered (and still is) in the USA as the Promavia Jet Squalus, N112SQ, and promoted as the Phoenix FanJet, later as the Phoenix SigmaJet."