Flight delayed by woman hurling coins at jet engine

BEIJING -- Chinese airlines aren't exactly known for flying on time. Four of them ranked among the worst last year when it comes to on-time arrivals and departures.U.S. airlines improving in on-time performanceNot all delays are the airlines' fault, of course. For instance, it wasn't China Southern airline's fault this week when a Guangzhou-bound flight was delayed for more than five hours at Shanghai Pudong International Airport.The culprit was a woman in her 80s, who was just trying to keep ev