If you put a horn on a jet and broke the sound barrier then honked the horn what would happen?

Question

If you put a horn on a jet and broke the sound barrier then honked the horn what would happen?

Answer 1

On the outside, you'd not hear much due to the sound of the sound barrier screaming.

On the inside of the jet, you'd get annoyed at the sound of the horn while you're trying to talk.

Answer 2

you would hear nothing

Answer 3

the horn would go toot, toot.  and you would like it.

Answer 4

sound is caused by air waves.  assuming you are in a pressurized jet, then the air would be moving the same speed as you and it would sound normal