FC should have 4 ships like they already do.

Personal Houses should have 1 ship.

And yes it should be ran by ONE PERSON because there is a method to unlocking more stuff and if even 2 who don't know how to communicate or they are on at different times and cant... that is enough to screw up the flow. Now whether or not that person is an ACTUAL leader, who designates roles like you gather this and you craft that is not SE fault... they should be giving people roles to feel included and if they are not then your FC should make someone else the airship leader.