Meanwhile , newly promoted FAA National Operations Manager Ben Sliney is in a meeting when it is reported that American Airlines Flight 11 from Boston to Los Angeles has been hijacked after Mohamed Atta is overheard on the radio saying " We have some planes " . Minutes later the aircraft crashes into the North Tower of the World Trade Center . Much to Sliney and his staff 's horror , they learn that a second flight , United Airlines Flight 175 also from Boston to Los Angeles , has been hijacked , and after New York air traffic controllers attempt to contact the aircraft , it is seen live on CNN plowing into the South Tower of the World Trade Center . Sliney and his staff realize they are dealing with several hijackings and order the military to be on the lookout for American Airlines Flight 77 , which is reported missing and presumed to have also been hijacked
United Airlines Flight 175
United Airlines Flight 175
United 93 (film)