Sorry to add comments such as this, but,
If as has been said earlier in this thread, that the scumbags who flew the birds into the building have had some sort of "Pro" help such as an existing Big Bird pilot, then it stands nearly to reason that the training pilot would be from the Mid/Far East, therefore how safe is it now to allow these sorts of area's/Countries to send their A/C to the USA and Europe, with this sort of Crazy mindset that now seems to prevail in these area's?
Who would risk one full of pax going into some other serious target, say in a few weeks time!