<Why wouldn't there be?

Because the takeover was properly planned and executed.

Aren't there TWO highly trained pilots in the cockpit?

what’s “highly trained”? They were likely well trained and experienced.

Shouldn't there have been a struggle somewhere, somehow?

sure, unless it was pulled off correctly, as it appears to have been.

Has anyone seen the reports for the exact times the transponders were shut off?

Probably, but not me. I don’t dig for that kind of information unless I have too. Why don’t you look for it?

I don't know anything about AWACS technology, but I know a lot of airline pilots doubted the incredible amount of planning and experience to use three separate airliners to accomplish such a diabolical mission.

There are also a lot of airline pilots (most of whom I do not know) who do not doubt the level of planning required -- and there were 4 aircraft involved.

Dan