About 10000 is the norm(after 37 years and 3 co's)..This Altitude covers the'approach' items like'lights'Press'and Alt' settings(if they're not here-they' must' be on the 'before landing check'.....
Seen several cases where they North American flights have ended up 'missing' them due to the lower'Transition'levels....
Above 10000' one is refering to items one can't activate yet..
