Cant find any information regarding OPGT

[srcooke]

There is only a basic runway/terminal chart published on the AIP.

See also:

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.