Changi in Singapore regularly tops global lists and beats just about anything in the U.S. There's a lot of focus on the customer experience and a willingness to try to learn and make that better. That even extends to areas like immigration or ground transportation that can be real achilles heels in other places.

BKK has a nice new facility but is amazingly consistent with negative experiences with the taxi touts. In Manila, I think T3 is an improvement over T1, but the banking and ground transport experience can be a nightmare.

Asian countries still sometimes have willingness to use general tax revenues to develop airports even ahead of demand, whereas in the U.S. in too many places the name of the game is minimize taxex needed first, then let chips fall where they may for pax. If Atlanta had done things like that in the 60s and 70s the metro area today likely would be about the size of Nashville or Charlotte rather than what it became.