Maybe so in Antartica / Canada and others - I'm only referring to western Europe - and the exact/fluctuating level of contrails is miles away from the point of my post - that was only as an aside from my point of game tech affecting game play.
In theory, if the conditions are met then you'd have the same thing in Western Europe. As someone said, it's based on temperature and not altitude but the conditions have to be there for it to happen.
It must be a long time since you've been in WB's - for quite some time you rarely see the pony mafia below 20k and S3 action is frequently in the 25k to 35k level weekly( if it at all concerns strategic bombing). Started out in AW in '86 - Atari ST1040 c/w 12" screen and mouse LOL and FHWB 2.77 for a few years too.
Yeah, it's been a long time since I've played WB. I left shortly after HiTech sold it to Wild Bill, which was back around '98 or so. Since at the time WB was still primarily charge by the hour, it was actually rare to find fights above 10,000ft. Same with AW when I first started (back in '93), since people were paying up to $12 an hour to play they'd rather spend that time fighting then climbing and again rarely saw planes above 10,000ft. When AW went to unlimited play, the 'glass ceiling' disappeared and fights got higher.
ack-ack