I dun really venture to airbases in case you get caught and
questioned. Tried once only at Kaki Bukit to catch the Typhoons on
finals for PLA. TAB is a no no.
Seletar isnt really a good place to spot planes. Positions isnt
good. I'm sure you know, unless you can get to the airside.
For changi, there are various spots. Best is at T1 viewing gallery
where everything is available and convenient . Also there is the
changi village road but I heard it will be close soon. Your time
spent there depends on how fast you get chased away. Then there is
still Changi Beach.
Hope this helps...
Btw, you still in YFC? Can you help me check out some students in
Course 131?