Mirage G: The Impressive Turbofan Aircraft With Moving Wings The Mirage G was a French prototype aircraft that ultimately never made it into military service. The jet, powered by a potent Pratt & Whitney/Snecma FF 306 turbofan, revolutionized the idea of the variable geometry wing. The concept wasn't entirely new when Dassault Aviation put its Mirage G aircraft on display for the first time at the Paris Air Show in May 1967. "A variable-sweep wing imitates nature," Joe Pappalardo, writing for the Smithsonian Magazine, notes. "To glide or slow down, birds extend their wings; to speed up, they tuck them...