Southwest plane nearly crossed runway in front of departing JetBlue plane Thursday in Virginia
                                
                                
                                    (Newser) -
                                    Two planes nearly collided at Reagan National Airport in Arlington, Virginia, on Thursday, and might have done so if an air traffic controller hadn't yelled "Stop!" Around 7:40am, an air traffic controller instructed Southwest Flight 2937 to cross runway 4 on its way to runway 1....