One of your bones of contention has been that it is difficult, if not impossible, to have navigated the aircraft to the WTC. Mr. Rust's escapade shows that it is entirely possible to fly an aircraft long distances without a great deal of sophisticated navigational equipment aboard it.
Heck, B-17s were flying missions hundreds of miles long in WWII without the benefit of modern-day technologies such as GPS. Those long missions of sixty-plus years ago were performed using very basic navigational techniques.