From Gail Sheehy in the NY Observer
Before their F.A.A. superiors forbade them to talk to anyone, two of the controllers told the Christian Science Monitor on Sept. 11 that the captain of Flight 11 [the first plane hijacked], John Ogonowski, was surreptitiously triggering a "push-to-talk" button on the aircraft's yoke most of the way to New York. When controllers picked up the voices of men speaking in Arabic and heavily accented English, they knew something was terribly wrong. More than one F.A.A. controller heard an ominous statement by a terrorist in the background saying, "We have more planes. We have other planes."
...To this writer's knowledge, there has been no public mention of the Flight 11 pilot's narrative since the news report on Sept. 12, 2001. When Peg Ogonowski, the pilotís wife, asked American Airlines to let her listen to that tape, she never heard back.