WINDSOR LOCKS, Conn. (AP) — A vintage B-17 bomber experiencing trouble after takeoff crashed into a maintenance shed as it circled back for a landing today at a busy airport in Connecticut, bursting into flames and killing an unknown number of people, officials and witnesses said. The Collings Foundation confirmed the plane that crashed was the B-17 nicknamed the “Nine-O-Nine,” the same plane that crashed in August 1987 at an air show in Beaver County. In the 1987 incident, the bomber overshot a runway while attempting to land at the Beaver County Airport in gusty winds and plunged down a hillside as thousands of spectators were waiting for the show’s finale.