For air traffic controllers, the morning of Sept. 11, 2001 started off like many others, until a curious voice came over the airwaves at 8:24 a.m.
“If you try to make any move, you’re endangering yourself and the airplane,” the voice said. “Just stay quiet.”
Boston control tower officials had just overheard 9/11 hijacker Mohamed Atta in the first of what would be a litany of terrifying transmissions — most between stunned air traffic controllers — that would be sent through the morning as four planes were hijacked in the worst terror attack in U.S. history.
