Quote Originally Posted by tunerforlife
not too make you feel stupid but those type of planse only go at around 600-700mph tops
you're right, the top speed of a 747 is about 604mph...too bad that's not a 747 though (name of image) ...but I did know the top speed of a four engine jet that size was about 100 mph below Mach 1 but for some stupid reason I was thinking the speed of sound was like 1k-1,100. 1,100/700...hey it rhymes? Actually it's closer to 740 or 760 if you could go that fast at sea level.

The cruising speed is around 550mph so it's still way above the 400 mark.