Engine technology drives A320/737 replacement timetable. Airbus and Boeing are unlikely to kill either the 737NG or the A320 as long as the airplanes are selling as briskly as they are, but that isn’t stopping engine manufacturers from mounting aggressive technology development programs. At the 2005 Paris Air Show, CFM International announced its LEAP56 program that excluded few technology possibilities. In Singapore, Pratt & Whitney is pushing ahead aggressively on geared turbofans, the same direction in which it has been heading for two decades. Feb 23, 2006