In the X, you had to take 470 minimum to make us of maximum range 430 just wouldn't be enough.
Also keep in mind everything above 410 isn't RVSM. There are no levels 420, 440. Cruising in 410, in need of a higher level, you have to take 450. If 430 isn't enough, 470 is the next higher.
Safelife (glows in the dark)
Last edited by safelife; 24th Dec 2017 at 06:53.
Reason: Added information