On the morning of September 11, 2001, the nation changed forever as hijackers seized control of four commercial aircraft, aiming them at targets in New York City and Washington, DC. In under two hours, nearly 3,000 people had been killed in the attacks. Less than nine months into his presidency, the events put George W. Bush to the test—and shifted his focus from domestic priorities to a global hunt for the perpetrators. | American Experience | PBS

"9/11: Four Flights” documents the powerful stories as told by family and friends and personal voicemails from those aboard each of the four hijacked jetliners on 9/11. The two-hour documentary airs September 11 at 8/7c. | HISTORY