It wasn't a missile. It was a drone made to look like a passenger jet. Remote guided into a beacon. They might have planted a bomb on the plane to detonate upon contact with facade. Nobody died via the planes. They were all vicsims for the most part from research and the particpants were paid a handsome amount of money. Millions in fact to stay quite because they were in on it. Researchers have already discovered these frauds. The plane aspect was very much the same sort of psyop you see in these smith mundt modernization act psyop shootings. There was an aspect of fakery and fraud. Or just read Operation Northwoods that basically tells you what they did on 9/11.

Your first goal would be to find out if the planes existed, who were the passengers if any, do they exist, are there any anomalies (thousands), flight radar, etc.

Clearly, two of the planes existed on flight radar but air traffic control was completely confused because of the various exercises going on at the same time, all carefully orchestrated this allowed at least two of the planes, either in flight or not to land at an undisclosed military base and exchange transponders midair in place of a reinforced commerical airliner remote guided into a beacon.