Eli5: Is there a variation in physics/speed when a plane breaks the sound barrier and what does it feel/sound like in the cockpit?

Question

Are there any variations or notable sensations when you break the sound barrier in a plane?

In: 49

Answer 1

I’ve flown on the Concorde before. Takeoff was really loud, but you don’t hear or feel anything when you break the sound barrier. There was a display in the cabin showing the Mach speed.