Let’s pretend we are in science class for a moment. When a plane is traveling at the speed of sound, it is literally compressing the air at the front of the wing and leaving an area of negative pressure in the plane’s wake. What results is actually two sonic booms that are oftentimes experienced as a single sound. The sonic boom is a cool effect, but it’s not so good for people who live on flight paths, nor is it likely all that good for the wildlife in the area either. But we want to travel at that speed.