Falcon 20Dassault Falcon 20 airplane model. The Mystere or Falcon 20 and 200 family remains Dassault's most successful business jet program thus far, with more than 500 built. Development of the original Falcon 20 traces back to a joint collaboration between Sud Aviation (which later merged into Aerospatiale) and Dassault in the late 1950s. Prototype construction began in January 1962, leading to a first flight on May 4,1963. This first prototype shared the