At least one of the pilots was a former military pilot (the Pentagon attack). The Pentagon attack was the most difficult, flying an jet aircraft at over 400 knots at treetop level. The pilot tried first to strike the white house, but was unable to line up, so he went for his secondary target (military attacks have secondary targets, criminals do not).
The Pentagon was a miltary target. The WTC was an economic target. This was a military attack.
The two planes that struck the trade center attacked from opposite directions. This is typical of how a military air attack would happen. The first was from the north, the second was from the south. The second attack coming from an initial point in central New Jersey (initial point is a miltary aviation concept), put the plane as far away from our interceptor fighters out of Massachusetts as possible. Again proving this was a planned military attack.
As appointed as commander in chief of the Taliban army, Bin Laden was not acting as an independent criminal but was functioning as the commanding general of a sovereign country's military.
Osama bin Laden declared war on the U.S. in 1996.