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Quoth BillOwen
I also asked him about Hanjours magic carpet ride and got the truth that it "might not be as hard as you think". I have to bow to his superiour knowledge there, but Jesus, I would still have to put it in the hmmm, I don't know about that category.
This argument from incredulity is really wearing thin. Instead of going "hmmmm", pop over to ITVV and pick up one of their excellent in-flight airliner videos. Watch it a couple of times. Pay close attention to the description of the relevant autopilot modes, especially LNAV and VNAV. Also note the procedure for inserting a waypoint into the flight plan. Visit any FBO, pick up the latest IFR Enroute High Altitude maps, and jot down the NAVAIDS nearest your targets.
You now have enough information to be a 9/11 hijacker. And no, I'm not revealing arcane secrets: millions of people know all about this stuff. (Most don't wear tinfoil beanies, though.)
As for all that blather about "3 buildings" and other nonsense, go find yourself an "ask the civil engineer" column.