John Travolta, who starred as 'Grease' bad boy heartthrob Danny Zuko, crashed the Hollywood Bowl's sing-along event Friday. He surprised the audience and "Grease" co-stars alike.

Welcome back on the Daily Aviation for a new documentary video about the QF-16, a standard F-16 Fighting Falcon modified into a full-scale target drones for the US Air Force. Footage Credit: US Air ...