BOSTON, June 13 -- A JetBlue flight landing at Boston's Logan International Airport rolled off the runway and into the grass on Thursday, an airport spokesperson said. No one on JetBlue flight 312 was injured, but the runway remained closed Thursday afternoon and a ground stop on all flights was in effect. Meanwhile, crews assessed the aircraft and passengers were bussed to the terminal, said Samantha Decker, with Massachusetts Port Authority, in an email. Passengers could be seen descending from the plane using stairs provided by emergency vehicles surrounded by dozens of emergency crews, according to an Associated Press journalist at the scene. The plane was coming from Chicago.ap...