Sorry forgot to mention another great airport I have been to is Osaka Itami, from outside the very low fence, you get 50mm= B777-300 touch down in front of you! or a 75mm =B777-200 touch down, very smokey!!!
OK here is my experience there:
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Photo © Sam Chui
Osaka Itami is sadly only domestic airport now, still can imagine before KANSAI, all the Int'l traffic hang around there.
Also in my opinion, Osaka Kansai is only good for Summer light up the deck, you need they land on Rwy24 to hit the deck right, 06 is not the spotter friendly Rwy.
Hongqiao may sound interesting, but Beijing have most things on offer, weather wise are better in fall /winter season if you dont mind cold, but blue sky wise.