The incoming bridge will usually be created part of the aircraft
model file; it is important to understand that each AI/MP model will
have an incoming bridge as each element in /ai/models needs its own
bridge to keep up with the incoming sequence id. This scheme may not
work properly as it relies on the model being loaded which may only
happen when visible so it may be necessary to track AI models in a
seperate instantiatable incoming bridge manager.
The outgoing bridge would usually be created within the aircraft loading Nasal.