“Something is wrong. We are in a rapid descent... we are all over the place. ... I see water. I see buildings. We are flying low. We are flying very, very low. We are flying way too low. ... Oh my God, we are way too low... Oh my God, we're —” – Flight attendant Madeline Amy Sweeney describing the hijacking of American Airlines Flight 11 at the end of her phone call to a supervisor.
"Are you guys ready? Let's roll." - Flight 93 passenger Todd Beamer, apparently as a signal to other passengers to attack the hijackers.
"We're young men; we're not ready to die." - Kevin Cosgrove, a business executive who was on the 105th floor of the south tower moments before it collapsed.
"Hi, this is the captain. I would like you all to remain seated. There is a bomb on board and we are going back to the airport ... Please remain quiet." – Hijacker aboard United Flight 93, which crashed near Shanksville, Pennsylvania.
"We may have a hijack. We have some problems over here right now." – Air traffic controller on the ground on Long Island shortly after the first plane struck the north tower.
"Numerous civilians in all stairwells, numerous burn [victims] are coming down. We're trying to send them down first… We're still heading up.” – Capt. Patrick Brown, whose company had climbed to the 35th floor of the north tower a half-hour before the first collapse.