https://handbook.airlinesim.aero/basic-knowledge/traffic-rights/
According to this page, any new game world uses list C. But apparently OTTO VI is using something else since Argentina has open traffic rights.
Wrong List of traffic rights for OTTO VI
Oh, thanks for letting us know!
This wasn’t intentional, but I suppose we’ll keep it as it is and update the handbook accordingly.
It’s still planned for future game worlds to use list C though.