Early Brunei International Airport
Many have forgotten when Brunei International Airport was first completed, it did not have today's aerobridges which allow passengers to walk in directly to the planes. In the early days, even when the International Airport was completed, passengers still walk down to the tarmac through the two walkways and then up the stairs to the aeroplanes.
I thought Brunei was quite behind in this aerobridge thing. When I first landed in Geneva around 1990, I remembered walking down the stairs and walking across the airport. There was no aerobridge either there. There are many airports around the world which still does that. Surabaya is one which I recently used. Tehran was another.