After going by the bug list :
https://sourceforge.net/p/flightgear/codetickets/search/?q=labels%3A%22AITraffic%22+and+%21status%3AVerified+and+%21status%3AInvalid+and+%21status%3ADuplicate+and+%21status%3ADone+and+%21status%3AWontFix+and+%21status%3AFixed+
I'm going to build AI Tests. There is at least one more I'm aware of. That is that forward push AI aircraft don't stop properly.
What I need now are test scenarios. I need a parking somewhere on the world where the bug manifests itself and best is one that is picked even if there is only one AI aircraft. Selection via radius and or airline is of course possible.