what three locations were the terrorists targeting

The three locations that the terrorists targeted in the September 11, 2001 attacks were:

1. The Twin Towers of the World Trade Center in New York City.
2. The Pentagon, the headquarters of the U.S. Department of Defense in Arlington County, Virginia.
3. The United States Capitol (or possibly the White House), the intended target of the fourth plane which crashed in a field in Pennsylvania after passengers attempted to regain control.

These coordinated attacks involved hijacking four commercial airplanes, with two flown into the Twin Towers, one into the Pentagon, and the last crashing in Pennsylvania, believed to be targeting the Capitol or the White House.