Here is my source for the time taken for pilots to squawk 7500-
The new pearl harbour revisited by David Ray Griffin, page 176-
The fact that neither pilots of flight 11 squawked this code constitutes a big problem for the official story. We can see this more clearly by looking at CNN's treatment of this issue the same day, which said,
Flight 11 was hijacked apparently by knife-welding men. Airline pilots are trained to handle such situations by keeping calm, complying with requests, and if possible, dialling in an emergency 4 digit code on a device called a transponder. It transmits crucial flight data to air traffic controllers. The actions takes seconds, but it appears no such code was entered.
A problem with this statement is that the word ''dialling'' suggests that the operation would be like dialling a telephone, which might take several seconds. However, the transponder has 4 knobs. The pilot, or co-pilot simply rotates the knobs until the transponder reads 7500. this action, PILOTS HAVE TOLD ME, TAKES ONLY 2 OR 3 SECONDS.
In any case, the crucial issue was indicated in the CNN story, by the phrase ''if possible''. Would it have been possible for the pilots of flight 11 to have performed this action? Right after the above quoted comment CNN said,
But in the cabin a frantic flight attendant managed to use a phone to call American Airlines Command Centre in Dallas. She reported the trouble. And, according to the Christian Science Monitor, a pilot apparently keyed the microphone, transmitting a telephone conversation.
If there was time for both of those actions to be taken, there would have been more than enough time for one of the pilots to squawk the 4 digit hijack code.
