Exactly seven years from yesterday (still today to some), early in the morning on September 11, 2001, nineteen hijackers took control of four commercial airliners en route to San Francisco and Los Angeles from Boston, Newark, and Washington, D.C. The hijackers flew two of the airliners, American Airlines Flight 11 and United Airlines Flight 175, into the North and South Towers of the World Trade Center. Another group of hijackers flew American Airlines Flight 77 into the Pentagon. A fourth flight, United Airlines Flight 93, whose ultimate target was either the United States Capitol or White House, crashed near Shanksville, Pennsylvania.