I had an interesting experience when I lived in Singapore some years ago, wanting to spend a couple of days on Tioman Island in Malaysia and finding that there was a short flight there from Seletar, so we took it. It was via Skyvan, that we discovered was a hardly tarted-up Singapore Air Force version (the 3M) 9V-BNJ. This was in March 1989, and took 45 minutes, with the return a couple of days later. The spartan interior had a very military feeling, and was graced by a large luggage net for the bags. Great fun in spite of the noise. I've got a photo somewhere.
Laurence