Two aircraft that departed Boston's Logan Airport on September 11, 2001, American Airlines Flight 11 and United Airlines Flight 175, were hijacked by terrorists as part of the September 11 attacks. After the hijacked planes struck the World Trade Center, Boston Center air traffic controllers realized that both aircraft were Boeing 767s departing Logan Airport for Los Angeles. Delta 1989 fit the same profile as other hijacked flights: it had also departed Logan Airport for Los Angeles and was also a Boeing 767."The 9/11 Commission Report; Chapter 1.2 Improvising a Homeland Defense " Boston Center staff notified the Federal Aviation Administration (FAA) about their suspicions at 09:19 EDT (9:19 AM) when the FAA's New England regional office contacted the Herndon Command Center and asked Herndon to relay a request that Cleveland Center notify Delta 1989 to increase cockpit security. Herndon then ordered controllers to send a cockpit warning to Delta 1989. The 9/11 Commission Report; Chapter 1.1 "Inside the Four Flights" Boston was tracking Delta 1989 and not receiving any radio contact from the aircraft. In fact, Delta 1989 was in Cleveland airspace and in contact with Cleveland Air Traffic Control Center.
