More on the Sweeney Call

From an LA TIMES article "AFTER THE ATTACK; DESPERATE FLIGHT; Aboard Flight 11, a Chilling Voice; ERIC LICHTBLAU. Los Angeles Times. Los Angeles, Calif.: Sep 20, 2001. pg. A.1"
(snip)
"But Sweeney's phone call, with details that coincide with the hijackers' takeover of the cockpit, could provide investigators with one of their most valuable pieces of evidence in reconstructing the hijackings.

FBI officials in Dallas, where American Airlines is based, were able, on the day of the terrorist attacks, to piece together a partial transcript and an account of the phone call. American Airlines officials said such calls are not typically recorded, suggesting that the FBI may have reconstructed the conversation from interviews.
(snip)
It is unclear from the phone account where Sweeney was when she was talking to the ground manager or what type of phone she used. But even as she was relating details about the hijackers, the men were storming the front of the plane and "had just gained access to the cockpit."

Then, she told Woodward, the plane suddenly changed direction and began to descend rapidly.

"At that very point, Sweeney tried to contact the cockpit but did not get a response," according to the investigative report. The pilot reportedly also was trying to alert authorities of the situation by surreptitiously clicking his radio transmission button.

Woodward then asked Sweeney whether she knew her location.

The chilling reply: "I see water and buildings. Oh my God! Oh my God!"

At that point, according to the report, the conversation ended.

Officials at American Airlines said information about the phone call was turned over to the FBI, but they refused to discuss details. "The FBI has told us not to discuss anything," said airline spokesman John Hotard. Officials at the FBI also declined to discuss the call." (snip)

Now, according to the 9/11 commission report, Sweeney ID'ed the seat numbers of thehijackers at 8:38 or so:
"At 8:38, Ong told Gonzalez that the plane was flying erratically again. Around this time Sweeney told Woodward that the hijackers were Middle East- er ners, naming three of their seat numbers."

Again, the LA Times article:
"But even as she was relating details about the hijackers, the men were storming the front of the plane and "had just gained access to the cockpit.""

Clearly the hijackers gained access to the cockpit AFTER 8:38am, according to Sweeney.

So why did the plane change course and its transponder go off much earlier?

In fact, the 9/11 commission report says the hijacking started around 8:14am. How the hijacking occurred without the hijackers in the cockpit is not clear, and they do not give any clues.

Something clearly is not adding up.