Does the FSX version care whether your AI traffic files are in TDBB or TT format?

No, Heli Traffic 2009 runs outside of the FSX AI system, other than to display the red labeling, if it's turned on.

No, Heli Traffic 2009 runs outside of the FSX AI system, other than to display the red labeling, if it's turned on.

I need to contact them. If they are using the same flight models that the earlier version used then they are my flight models, and I haven't given anyone except the original author permission to use them, and that was for freeware only.

Heli Traffic 2009 runs outside of the FSX AI system,

...which, I suppose, explains how the original poster can do this:

You can define scheduled helicopters with waypoints to make them turn in flight etc,

...pretty interesting what can be done outside the SDK...