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It used to be a thing, mostly hijackings to Cuba, often for ransom payments. Between 1961 and 1972 there were 159 hijackings in American airspace.
I am the suspicious type; so, I suspect this was for the purpose of getting remote-control gear installed in commercial jets.
This explains the way they could have been piloted 911. The doofuses that trained on crop dusters in Florida had no possibility of pulling off any of the maneuvers carried out that day.
The four hijacked flights were all either Boeing 767-200ER or Boeing 757-200, two models introduced within a year of each other in the early 1980s.
Thanks for that info.