MrKrabs, Thanks for the reply. I used your tutorial to get started, great help. How do you attach a file to a post? I don't see that option in the post or post reply window. On another question, I uploaded the file to a custom arena. Does it work the same in that any unassigned planes are assigned to AI? The program crashes when I try to run it in custom arena with mine the only assigned plane, so I deleted it from the uploaded missions. When I build the res library it gives me an errror message in that the plane can't fly the first segment which is the spawn at 12000 feet in a take off segment with an end altitude of 10000, but it creates the mission file and works well offline. Any guidance on creating an inair spawn first segment that does not produce the error message? I am assuming that is why the program crashes in the custom arena since we upload the .mis file rather than the .res file. I tried various combinations of speed, altitude etc, but it still gave that error.