[vonofterdingen]

Dinga, you probably have too many planes in the sky. DCG defaults to using a max number of aircraft for missions. To tailor this setting and others to your tastes, click Run -> Setup Wizard. This will allow you to set parameters for your missions or campaigns.

Changing at this point will not changes the settings for your existing campaign though. You will need to delete that one and start another for the changes to take effect.