An article by Glen Johnson (11/23/01) mentions Atta's mistake and Ogonowski's keying of the microphone button on the yoke.
Under any scenario, it appears that the hijackers' entry was surprising enough that the pilots did not have a chance to broadcast a traditional distress call. Apparently at least one of the pilots on Flight 11 remained alive and at one of the cockpit's two control sticks, because he intermittently keyed the microphone button on the yoke so controllers could hear his conversation with a heavily accented hijacker.
The transcript of the air-traffic-control conversations shows that at 8:24 a.m., a controller heard a suspicious broadcast from Flight 11. Apparently, one of the hijackers confused the aircraft's radio with its public-address system.
"We have some planes. Just stay quiet and you will be OK. We are returning to the airport. Nobody move," the speaker said.
"Who's trying to call me?" the controller responded.
There was no response. Then came another radio broadcast, the transcript shows.
"Everything will be OK. If you try to make any moves, you'll endanger yourself and the airplane. Just stay quiet," the speaker said.
Glen Johnson article "Probe reconstructs horror, calculated attacks on planes" Gail Sheehy covered the story on 2/15/04:
According to a timeline later adjusted by the F.A.A., Flight 11's transponder was turned off at 8:20 a.m., only 21 minutes after takeoff. (Even before that, by probably a minute or so, Amy Sweeney began her report to American's operations center at Logan.) The plane turned south toward New York, and more than one F.A.A. controller heard a transmission with an ominous statement by a terrorist in the background, saying, "We have more planes. We have other planes." During these transmissions, the pilot's voice and the heavily accented voice of a hijacker were clearly audible, according to two controllers. All of it was recorded by a F.A.A. traffic-control center in Nashua, N.H. According to the reporter, Mark Clayton, the federal law-enforcement officers arrived at the F.A.A. facility shortly after the World Trade Center attack and took the tape.
To this writer's knowledge, there has been no public mention of the pilot's narrative since the news report on Sept. 12, 2001. Families of the flight crew have only heard about it, but when Peg Ogonowski asked American Airlines to let her hear it, she never heard back. Their F.A.A. superiors forbade the controllers to talk to anyone else.
Gail Sheehy article "Stewardess ID'd Hijackers Early, Transcripts Show" It sure sounds like Ogonowski was heard on some transmissions.