no answer. what is furthest North that 20:09 could be in your analysis..
close to the placard...
What is accuracy of the TT communication and machine timestamp? 2 min?
I assume that your "TT communication and machine timestamp" refers to the teletypewriter that the ARINC people used to pass messages between airliners and their companies.
Here is how that works. Assume that an airliner in flight wishes to pass a message to its company's office at its next destination. The airliner would contact the ARINC service on its frequency and tell the radio operator who he was, who he wanted to contact, and then the message. The ARINC operator would then enter that in a prescribed format in his teletype and push the "send" button. The teletype would automatically enter the sent time at the end of the message.
If the message required a reply to the airliner, the reply would be sent by teletype to ARINC and they would figure out where the airliner was at that point and route the message to the appropriate ARINC ground station which would then contact the airliner on the ARINC radio frequency and give the message.
In the case of the NWA hijacking, a phone patch was set up by ARINC so that the NWA station in Seattle and NWA offices in Minneapolis could listen to the actual radio communications between ARINC and the airliner.
There are two ARINC messages with teletype time stamps showing and notes from NWA/FBI personnel who recorded the time of the actual radio transmission. In each case, the teletypewriter message was time stamped two minutes after the actual radio transmission. But two minutes is not a standard and the time difference could be less or more depending on a number of factors.
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