I got word the map had changed and the target planes were not passing over the field. I changed that and separated the P51s to give a little more time to switch targets. The bombers are at 6k. Instructions below still work, although I found that when I create a custom arena it kicks me off, but if I go right back online the custom arena is there. Good luck and let me know if it needs to be changed. Lead computing gunsight is turned on from the clip board. Options/Arena setup/enviroment/arena settings/flight mode flags/change Check lead compute gunsight. Tab key should select the target for the lead compute in game.
1. Create a custom arena ndisles terrain
2. Go to staged missions, select GNDTOAIR
3. Check load mission settings
4. Load mission
5. Click on populate mission.
6. Assign your self to one of the Axis planes
7. Click on start mission
8. Click on start now
9. When the mission comes up, bail and end sortie
10. Click on kill mission
11. Move to field A40 in sector 9,7
12. Select a Wirbel, Osti, M16 or field gun and spawn in the hanger
13. Go to staged missions, select GNDTOAIR
14. Load Mission
15. Start Mission (do not click on populate)
16. Start now
17. 5 or 6 P51's will dive on the field and 3 sets of bombers will fly over at 5k, try to shoot them. You can position your self so they are diving at you or passing to the side. Select one of the enemy planes with shift tab and the lead computing cross hair comes up.
18. Click on kill mission after the enemy planes have passed.
19. Repeat steps 13 to 18. Note that you have 10 time the normal ammo load. Steps 2 through 10 are just to get you in the right country which is Knights for the mission arena settings.