Aerojet on track to finish AR1 rocket engine work by 2019: CEO

WASHINGTON (Reuters) - Aerojet Rocketdyne Holdings Inc is on track to complete development of its AR1 rocket engine by 2019 as a replacement for the Russian-built RD-180 engine after receiving a funding "booster shot" from the U.S. Air Force, Chief Executive Officer Eileen Drake told Reuters on Tuesday.