I think Amex's airport database could do with an update. I'd love to be flying into Kai Tak in an A380, but I think we'd struggle. I was lucky enough to fly into Kai Tak in its last week, I spent a few hours on the roof of the airport hotel watching landings.
On a related note, does any one know how many tier points my CX HKG-SIN will earn? It is booked in A class, but it is only a two class aircraft, so I will be flying business. MMB is showing tier points for business, but are the points for class flown or class booked? (I thought the latter)