Newton is alive and well.
Mass conquers velocity.
The mass of the towers anchored securely in the mass of the earth far exceeds the mass of the aircraft.
According to Newton, it makes NO DIFFERENCE which of the two is moving, or if both are moving.
The result is the same whether it is the plane moving at 500 mph, OR the building moving at 500 mph.
It is now baseball season. If velocity made a difference, then a 100 mph fast ball would penetrate the wooden bat, leaving a smoking hole, when a batter holds a bat out to bunt. But the mass of the bat plus the mass of the player plus the mass of the earth supporting the player's cleats conquers the
speed of the ball. Think of the tower as a bat, and a plane as a ball.
What would happen if the plane were stationary, and the building fell on it at 500 mph? Same result either way.
Velocity is immaterial.
Newton says so.
Jack