i am creating a new ZGGG airport, but after i edit the parking and runway, i find that the ai plane just hold on the run way hold line and doesnt takeoff. also, i cant hear anything about the ai plane contact the tower for take off, whats happen?can somebody tell me how to fix this problem? thx a lot!

Are you using AFCAD to edit the Parking and taxiways? If so, I had the same issue. In AFCAD, there is an option to run an error check. THe error check will look for possible issues with your taxi layout and recommend a fix for it.I've found that when the hold position is too far away from the runway, it will cause this problem....Hope this helpsDavid

Most probably, you do not have a tower frequency in that airport.Check it with AFCAD, and add one if it is missing.:-)