 Complete the following phrase:  2,996: The deadliest aviation-related disaster of any kind, regarding fatalities on both the aircraft and the ground, was the destruction of the World Trade Center in New York City on September 11, 2001. On that morning, four commercial jet airliners traveling on transcontinental flights from East Coast airports to California were hijacked after takeoff. The four hijacked aircraft were subsequently crashed in four coordinated suicide attacks against major American landmarks by 19 Islamic terrorists affiliated with Al-Qaeda. American Airlines Flight 11 and United Airlines Flight 175 were intentionally crashed into the North and South Towers of the World Trade Center, respectively, 