I've just noticed a contrail in the sky! I think it's because I just had a visitor and her plane has caused it.

Not noticed that before!

Whoa that's pretty cool! I'll have to look for them next time I have a visitor.

Yep! You get them from people coming or leaving! I didnt realize immediatly either, heck, at first I thought it was somehow related to the meteor shower that was on when i first saw it.