"To crash a plane" means to intentionally or accidentally cause a plane to forcefully hit the ground or other objects, resulting in a destructive or disastrous event. Full definition
The religious people in this country are not the ones crashing planes into buildings and blowing themselves up. (religion.blogs.cnn.com)
I would love to have a mission where I need to deliver drugs from one crashing plane into another backup plane, using a rocket car, for example. (kotaku.com)
Just because they deliberately crashed planes into buildings, that didn't make them suicidal — it simply meant they were willing to die for a cause they believed in. (newscientist.com)