I got to Bandar Seri Begawan Airport at around 5PM for my 8:35PM flight to Dubai. Brunei’s Airport is small and beautiful, easily one of the most passenger friendly airports out there. A vast majority of passengers using the airport seem to be transiting rather than originating in Brunei, meaning that security and immigration are both very quick.
I was impressed that Royal Brunei had luggage trolleys for business class passengers (not that I needed it, with my carry-ons), though the station wasn’t staffed.
Despite how small the airport is, it has very high ceilings, similar to what you’ll find at many of the nicest airports in Asia.