The National Transportation Safety Board on Thursday cited the failure of a charter pilot to get a takeoff clearance in a February incident in Boston that resulted in a near-collision with a JetBlue flight. JetBlue Flight 206 that was about to land from Nashville was forced to perform a go-around because Hop-a-Jet flight 280 took off without clearance on intersecting runway, the NTSB said. The board said the airport surface detection equipment issued an alert, and the air traffic controller issued go-around instructions to the JetBlue flight.