F3 Perf
FL370 no problem in F3 (I have over 1700hrs in them) - knew of someone who took one to 67K once (idiot without a pressure suit!).
Speeds and heights that most airliners fly at no probs at all - could even chase down Concorde (but would run out of fuel first probably!).
It would be nice if the MOD charged the airlines for all the grief that NORDO airliners cause us in the military (I'll now duck for cover for the tirade of abuse ;-).
LJ