Planes despawn

[nilsabc]

Hi i have a problem with AI planes they all follow a rout and after 15-30 min they have order to land and then the mission starts again it all works fine and the script to restart mission is working. But the planes who have landed are not despawning thats really a problem for the performance. Is there a script where i can define that the AI planes despawn after landing and parking in their box? Or am i missing something (I did not set KI to inactive). A other thing i noticed is that landed planes sometimes begin to start again and doing what ever they want i really need to fix that issue. I hope someone can help me and i thank you in advance

PS: Its a MP mission

Greatings