To elaborate, the big benefit is that they keep pieces of the fan blade and engine from cutting through the body of the plane at close to the speed of sound. It

To elaborate, the big benefit is that they keep pieces of the fan blade and engine from cutting through the body of the plane at close to the speed of sound. It’s happened before and is not pretty. See: https://en.m.wikipedia.org/wiki/United_Airlines_Flight_232 https://en.m.wikipedia.org/wiki/United_Airlines_Flight_232