Perhaps it's bad form to compete..?
Please let me know...
It's great if you can offer a challenge if you win, and the cockpit photos (unlike those for the Silhouette Challenge thread), often don't need any preparation other than re-sizing, but it's not obligatory and
you're very welcome to compete! 
It would be handy, if you think (or maybe it's obvious) that you've answered correctly and you don't wish to post a Challenge, to say when you answer "please declare Open House if correct", as this will keep things moving along and minimise the delays that are inevitable with a forum that attracts contributions from all over the world.