The challenge would be for the most beautiful airport, player will create their airport, and submit it. Then the community leaders will all vote, the winning user should get a topic of their choice (that’s not theirs) posted Where every one will see their post. And it stays in a really visible spot for a week. (Because Users Supporting Each Other Makes the Forum A Great place)
We could also have a compition for the best designed airport. This would happen every week. Once they win they cannot be voted on again.