Which flight was hijacked and crashed into the Pentagon?

The flight that was hijacked and crashed into the Pentagon on September 11, 2001, was American Airlines Flight 77. This flight was part of a coordinated terrorist attack where multiple planes were taken over by hijackers. After being hijacked, Flight 77 was redirected towards Washington, D.C., and ultimately crashed into the Pentagon, which serves as the headquarters of the United States Department of Defense. This event was a significant moment in U.S. history, marking one of the most devastating attacks on American soil.

Other options do not correspond to the event in question. Delta Airlines Flight 123, United Airlines Flight 93, and Southwest Airlines Flight 456 are not associated with the attack on the Pentagon. United Airlines Flight 93 was hijacked as well, but it crashed in a field in Pennsylvania after passengers attempted to regain control from the hijackers.