Disclaimer: I was a Flightfox expert. It was one of the best computer games I ever played and it occasionally paid me to play. (In a similar vein, Drupal development is the best MMO I could imagine -- the graphics surely leaves something to be desired but the social aspect is literally life changing and the quests keep you in flow.)

I am not sure whether flight search in a crowdsource format could or should arise again but Flightfox made the (deliberate?) blunder of revealing all expert email addresses to the other experts in an email announcing big changes coming on January 14. If this would be a bigger industry, that'd been quite some news... I know at least one person who is thinking on continuing -- thanks Flightfox for keeping the community alive.