"I don't know, but I think we're getting hijacked," she said in a phone call to an American Airlines reservation desk at 8:19 a.m. on Sept. 11, 2001.
N.Y.C. museum creates 9/11 timeline →
"Somebody's stabbed in business class, and, um I think there is Mace that we can't breathe," Ong says. "I don't know, I think we're getting hijacked."
Audio files reveal 9/11 air traffic horror →