It should be listed under the country of Malaysia because it does not belong their.
This is what is should say.
Plus you are missing an airport in the listing of Brunei. It is Brunei International Airport "BWN" which is the IATA Code and the ICAO Code is "WBSB". The capital of the country is known as Bandar Seri Begawan I am sure you will make the corrections when you can.