The three cities from which the planes were hijacked on September 11, 2001, were:

• Boston, Massachusetts (Logan International Airport) - from where American Airlines Flight 11 and United Airlines Flight 175 departed

• Washington, D.C. area (Washington Dulles International Airport) - from where American Airlines Flight 77 departed

• Newark, New Jersey (Newark International Airport) - from where United Airlines Flight 93 departed

Thus, the hijacked planes took off from Boston, Washington D.C., and Newark.