To clarify, in case the "Well, not really " wasn't clear. Yes, indeed we were nowhere near really supersonic. No sonic booms .84 Mach is .84 Mach is .84 Mach regardless of ground speed. But the 763mph was kinda cool. I started getting excited when I noticed we were at 720 because I hadn't ever noticed a speed that fast before. And it just kept climbing from there. Surprisingly a very smooth flight too. You normally hear about allot of turbulence with such a strong tailwind. Not so this flight.