Your right about the first bombings being a hologram....... But the explotions were a MANIFESTATION, that caused due to the people who saw the attack and were present on ground zero.
As for The second bombings, there were no planes AT ALL on ground zero.
There are no eye witnesses who saw the second plane coming.
Where they saw the second plane crash was on live television.
A cartoon plane or a CGI was added, which was broadcasted on live television.
It was animated in such a way, caused a real explotion to happen.