First French Jet-Propelled Plane Tested -- An experimental jet-propelled plane - the first constructed in France - Rests atop the French four-Motored plane "Languedoc" Oct. 21 before being taken up 9,000 metres for its first flight. The French engineer Leduc, who designed this jet plane, said the test was successful. The flight was made from the Francazal Airfield, toulouse. In this photo the pilot is already in the jet plane, called "Leduc ready for the take-off. October 24, 1947. (Photo by Ass