Are you really allowed to fly at even flight levels above FL400? If not, then why?
Because separation above FL410 is 2000'. So the altitudes are FL410, 430, 450, 470, 490, 510.I still don't get it. All that article said was that RVSM is used between FL290 and FL410 and that separation was reduced from 2000' to 1000' because 2000' separation was "too cautious."