Pratt & Whitney says its ground-test F-35 Joint Strike Fighter engines have logged more than 4,000 system development and demonstration hours. The F135 jet engine is slated to power the F-35 in flight tests to begin next year.
U.S. aircraft, drones, and attack helicopters have launched significant airstrikes in recent days against Islamic State militants in Syria as part of the renewed air campaign against remnants of the group, U.S. officials said.
