On September 11th, 2001, the United States experienced the worst incident of terrorism in its history as four commercial airliners were hijacked for planned attacks on symbolic targets. Two planes were deliberately flown into the Twin Towers of the World Trade Center in New York City, New York, and a third was flown into the Pentagon in Arlington, Virginia. United Airlines Flight 93, delayed after departing Newark, New Jersey en route to San Francisco, California, was hijacked about 45 minutes into the flight as the Boeing 757 neared Cleveland, Ohio and then turned southeast toward Washington, D.C. Shortly before 10 A.M., it was seen flying low and erratically over southwestern Pennsylvania, and at 10:03 A.M. it crashed at more than 500 miles per hour into a reclaimed strip mine at the edge of a wooded area in Somerset County, Pennsylvania. There were no survivors, and all 33 passengers, 7 crew, and 4 terrorist hijackers were killed. In the hours and days that followed, telephone calls and later review of the cockpit voice recorder revealed that passengers and crew had learned of the attacks on the World Trade Center and the Pentagon, realized their plane was also part of the planned attack, and collectively decided to stop the terrorists from reaching another American landmark. Although the full details of what happened on board will never be fully known, all 40 passengers and crew are universally recognized as heroes. Flight 93 also holds special significance in the Bay Area because many of those aboard lived, worked, or were traveling there, and a memorial in Union City, California was created through the efforts of the city, the heroes' families, businesses, labor unions, and other supporters to provide a place of remembrance, reflection, hope, and healing, with individual stones and mirrors honoring each passenger and crew member.