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Hi Leonardo,
We are prioritizing new scenery for the busiest airports in the world. You can see the list on this page of the Airport Scenery Gateway, SBGL is not one of the 50 busiest airports, so it is not in the current line up to be developed by X-Plane.
There is a new user-submitted scenery on the Gateway that will be included in an X-Plane update though. If you wanted to try customizing this airport further, you can try getting started by downloading the free WorldEditor program here, and reading the manual here.
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