A320
You appear to be using Pilots for 9/11 Truth as your authority. This group asserts that the plane could not have hit the Pentagon. As they base this belief largely on the high altitude shown in the FDR data file, and as they reject the validity of the radalt data, which shows the plane hitting the Pentagon, this thread has been discussing the question of which is more reliable.
Can you explain why you personally think the pressure altitude is more reliable than the radalt?