Here's the section that Kalium Chloride refers to...
"With a maximum takeoff weight of 910,000 pounds (412,770 kilograms), the 747-400ER is now the largest
and fastest commercial airplane in the sky - cruising at Mach 0.85, or 85 percent of the speed of sound."
The full press release is
here. There's a contact email at the bottom if anyone fancies explaining the meaning of
fast to the author.