The pilot of Flight 11, apparently trying to signal flight control, has been intermittently turning on the talkback button in the cockpit. Boston Center hears a hijacker for the first time, talking to the passengers:
“We have some planes. Just stay quiet and you’ll be OK. We are returning to the airport.”
The transmission is unclear and there’s confusion about what flight this transmission originated from, and from whom. Boston Center gets to work trying to find out more.