Just flew From MIA to LHR on BA a 744. Can't believe the speed of this flight and wanted to get some expert views from you guys. According to the map on the IFE we were travelling at 720mph!!! Now I have flown tons of 747's 200's, 300's & 400's and have never got anywhere near this sort of speed. Thats something like mach 0.93ish. Would this be correct or is there some technical thing that makes this reading completely meaningless (pressures etc.) The flight director dude did mention that it was going to be a quick flight!!! Have any others experienced this sort of speed ??

For info, we departed Miami 17:15 local time and arrived London 0605 local time. Allowing for the 5 hour time difference this equates to a 7hr 50 min flight. Our flight out to Miami was more like 9.5 hrs ish (cant rememeber the exact times).

Incidentally, there was quite a tail wind and it got pretty bumpy... had bum left seat situation several times

Cheers for now, have a nice day!!