Notes:We were returning to home base in Elmira, NY from CHicago area. The highest speed I saw was 668 but pictured is 667. That is well over the speed of sound across the ground on that evening! It is the fastest I have ever personally seen in 28 years of flying! Additional info can be seen on the FMS. I believe we saw a max wind of around 212 knots. At the time of the pic we had 192 mostly on the tail doing 475 true.