Aluminum plane wings will not cut through 14 inch steel regardless of speed and weight. Not only is it impossible for the wings to have cut through the steel columns but it is absolutely impossible for the fragile wing tips to have also cut through the steel columns.
The wings would break off immediately upon contact and the plane would explode. It would not enter the tower and then explode. The plane would simply be obliterated to pieces by the 14 inch steel box columns and the steel and concrete floor trusses before it got anywhere near the inside of the tower.
Newton’s First Law of Motion: “A body remains at rest or in motion with a constant velocity unless acted upon by an external force.” The plane did not slow down as it made contact with the tower. How can the plane fly at the same speed through the steel/concrete face of the tower as it did through the air? This is impossible. The “plane” also violates Newton’s First Law.