When the first Bombardier CS100 flight- test aircraft took off on its maiden flight from Mirabel Airport near Montreal on September 16,2013, many among the thousands of spectators gathered to watch the first flight of Bombardier's new mainline commercial-jet family didn't even notice the aircraft had become airborne. So quiet were the CS100's two Pratt & Whitney (P&W) PurePower PW1521G geared-turbofan engines at full thrust that hundreds of spectators didn't hear the aircraft until it passed directly over them a few hundred feet above.
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