I saw a documentary years ago that explained and illustrated the construction of the towers, and exactly how the impacts caused them to weaken and collapse. It was so clear that a nontechnical person like me found it easy to understand. The only “lingering” question is for people who reject the facts and insist there’s some sort of conspiracy.
It appears that a lot of newer buildings are built that way and would likely collapse in very much the same way. Fortunately we don’t have passenger jets flying into them all the time for us to test the theory.
The Sears tower in Chicago is a notable exception due to its unique design.