That's excellent information thanks :-) I wouldn't even bother with the official viewing gallery. It's up perched high in the main check-in hall and you actually have to bend over to see out of a minimal opening onto the North facing parking area. Due to the angle all you are likely to see is the od...
I'll be in the Sing/KL/BKK in a few weeks with some time for spotting. Where is the best observation place for Suvaranabhumi? (spotting rather than photography). I spent many a happy hour on the observation terrace at Don Muang but the one at Suv hardly allows you to see out, nevermind see the aircr...