Hi YoYo,
Excerpt from P. 42 of the RTMM AI Shipping V2.0 User Guide:
DESIGNER NOTES & REQUIRED SCENERY
This freeware scenery enhancement is for use with Microsoft Flight Simulator X or Prepar3D. This enhancement requires the ORBX "Pacific Northwest" region, the ORBX "Pacific Fjords" region, the ORBX "Southern Alaska" region and the FSAddon "Tongass Fjords X" region. If you do not have these scenery regions installed this file will not work properly for you.
In the world of FSX/Prepar3D AI, when things like models are missing, many times the FSX/Prepar3D loader will error out when loading air, land and sea traffic that calls for missing models. Ketchikan is within 50 miles of the Tongass Fjords (TFX) region which is probably within the AI Traffic sphere when FSX/Prepar3D is loading the AI.
Rod