When you think about it, if you know anything about flying, they had to fly overlapping wingtips about 1 foot apart, and at a specific altitude and vector, a commerical route, and at the same speed as a commercial airliner, which is much less that the "comfortable" cruising altitude and speed of an F-16. Any change in course would have to be done in that same ultra-tight formation. This type of flying over that distance and time takes precision, talent, and a whole bunch of pure guts.
You have to give it to ground planning as well. At least one of the fighters had to be equipt with a commerial transponder, or a forged equivalent, to fool the ground tracking radar into thinking that the formation was, indeed, a commerical aircraft. Not to mention that any inquiry from ground commercial tracking had to be done in perfect grammer and language of the supposed pilot of the fake 'commerical flight'.
If anybody had a lick of sense they'd make this action into a movie. Hell, I'd pay 10 bucks to see it, and I'd rent the video later. Being a former pilot, small putt-putts only, I'd like to see how they did this! I've often wondered how they pulled off this attack. This small blurb in this article is the first I've heard of this. A-f'ing-mazing!