HI MattE,
I finally ironed out the bug, breaking the custom menu for the RAF team, at least I hope and if find some time, I will rework the Carquebut airfield today.
Currently you can only start a mission which is selected randomly. The pilots back then didn“t have the choice either

, and both teams can start a mission, but only 1 every 60 minutes, so all players can concentrate on the currently set mission objectives and no one can choose their favourite (most points / easiest / what ever reasons) mission.
The available planes a team has, now depends on their scores and currently I am also working on a "supply system", which shall enable the players to order certain rare types of planes. The supply will finally be also the winning criterium of the "Kanalkampf" scenario.