Let me reply line by line :) what they did with the actual planes: I don't have the exact info in my head but we are looking at three possible planes, one plane actually continued to fly, I believe it was the one out of Boston; its numbers showed up for several years. The plane that supposed to be at Shanksville appears to have been routed to another site and the people on board killed, plane sold for scrap. The third plane never existed. This info was compiled by several people who were in intelligence, several videos of their findings were made. the videos: the fake cgi videos were shot ahead of time of the planes entering the building, all they had to do was add live footage of the flames shooting out of the buildings. That is how they could be in the studios so quickly. In one of the faked videos they missed that the fake plane nose exited the other side of the building, when they showed it later, they blocked the area.

A video guy at the time made exact duplicates using special effects of each of the videos and offered 100,000 dollars to anyone who could disprove his work. That video was on youtube for a long time, it is gone now.