Open airports not found in SimBrief

[NAVData]

Hi,
I guess this will answer your question (look at the PS)

FAQ - Missing Airports in Charts, SimBrief, and FMS Data

We derive our Charts, SimBrief, and FMS Data from Jeppesen - a professional navdata provider for major airlines worldwide. The airports included depend on which airports are required by their real world customers. Note: for Chinese airports, Chinese authorities generally only provide data for international airports.

Cheers
Richard