The aircraft crashed into Tower Two ( the South Tower ) of the World Trade Center at 09:03 . The Flight 175 hijacking was coordinated with that of American Airlines Flight 11 , which struck the top of Tower One ( the North Tower ) 17 minutes earlier . The crash of Flight 175 into the South Tower was the only impact seen live on television around the world as it happened . The impact and subsequent fire caused the South Tower to collapse 56 minutes after the crash , resulting in hundreds of additional casualties . During the recovery effort at the World Trade Center site , workers recovered and identified remains from Flight 175 victims ( see the Aftermath section below ) , but many other body fragments could not be identified
American Airlines Flight 11
American Airlines Flight 11
United Airlines Flight 175