[FG28_Kodiak]

I've tested your mission, the problem is that the trigger is never triggered (testet it with different numbers of planes and plane types), then remove the trigger and made a new one but no effect, may be a bug in the Beta. Normaly your code should work.

So I made a workaroung without trigger.

using System;
using System.Collections.Generic;
using maddox.game;
using maddox.game.world;


public class Mission : AMission
{

    public override void OnActorDead(int missionNumber, string shortName, AiActor actor, List<DamagerScore> damages)
    {
        base.OnActorDead(missionNumber, shortName, actor, damages);

        AiAction MakeNewAircraft = GamePlay.gpGetAction("SpawnAircraft");
        
        if (actor != null && MakeNewAircraft != null)
        {
            if (actor.Name().Contains("BoB_RAF_F_FatCat_Early.000"))
            {

                MakeNewAircraft.Do();
                GamePlay.gpHUDLogCenter("New Enemy spawned!");
            }
        }
    }
}

What you need:
The script, a action in your Mission (i labled it "SpawnAircraft"), the name of the plane to destroy.
A new Airplane spawns after the previous is shoot down, you can improve it by adding a Planecount, etc.