At least six air traffic controllers who dealt with two of the hijacked airliners on Sept. 11, 2001, made a tape recording that same day describing the events, but the tape was destroyed by a supervisor without anyone making a transcript or even listening to it, the Transportation Department said in a report today. The taping began before noon on Sept. 11 at the New York Air Route Traffic Control Center, in Ronkonkoma, on Long Island, where about 16 people met in a basement conference room known as the Bat Cave" and passed around a microphone, each recalling his or her version of the events a few hours earlier. But officials at the center never told higher-ups of the tape's existence, and it was later destroyed by an F.A.A. official described in the report as a quality-assurance manager there. That manager crushed the cassette in his hand, shredded the tape and dropped the pieces into different trash cans around the building. The inspector general, Kenneth M. Mead, said that the officials' keeping the existence of the tape a secret and the decision by one to destroy it had not served "the interests of the F.A.A., the department or the public" and could foster suspicions among the public.