E
EddieM
Some years ago i went to the RIAT at Mildenhall, it was a horrible misty/murky/drizzly sort of day and no good at all for airshows but i perceivered, we were sat in my car due to the weather, anyway this B-1 raptor bomber did a very low fly by - i don't know 500ft possibly and as it came by a great big mushroom appeared behind it like in the pic below, i'll never forget it because i thought the windows were going in on the car they vibrated that much it was as though they were plastic
I very much doubt it broke the sound barrier, that would be a huge no no. That is most probably a dense con trail.