The planes that hit each building during the September 11, 2001 attacks were:

• North Tower (World Trade Center 1): American Airlines Flight 11 crashed into the North Tower at 8:46 a.m. The Boeing 767 struck floors 93 through 99

• South Tower (World Trade Center 2): United Airlines Flight 175 crashed into the South Tower at 9:03 a.m., hitting floors 77 through 85

• Pentagon: American Airlines Flight 77 crashed into the Pentagon at 9:37 a.m.

• United Airlines Flight 93: This plane did not hit a building; it crashed into a field in Shanksville, Pennsylvania, at 10:02 a.m. after passengers attempted to regain control from hijackers. Its intended target is believed to have been either the White House or the U.S. Capitol

Thus, the two World Trade Center towers were hit by American Airlines Flight 11 (North Tower) and United Airlines Flight 175 (South Tower), the Pentagon was hit by American Airlines Flight 77, and United Airlines Flight 93 crashed in Pennsylvania without reaching its target.