[Zauber]

The aircraft exceeded maximum operating speed while on autopilot that’s why they descended and diverted.

Normal cruise for the 787 is M85, MAXIMUM cruise speed is M89.

I’m an en route air traffic controller in New York.

[RckyRaCoCo]

Zauber:I’m an en route air traffic controller in New York.

I thought ZAU was Chicago ARTCC? : )

[cynwoody]

Normal cruise for the 787 is M85, MAXIMUM cruise speed is M89.

According to this link, Mach 1 at 41,000 feet is 660 mph. So, M89 would be 587 mph. According to FlightAware at 9:38 am, Flight 1146 was doing 655 mph at 41,000.