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Guatemala City Airport is pretty chaotic, esp. up front. Once you're through security, it's not too bad.
Casablanca used to be bizarre, but that was 20 years ago. I'm sure it's improved.
Santiago Chile must have improved, bec. when I was last there, it was awful. Something about Carabineros toting machine guns in the baggage claim was a bit nervewracking...
But that definitely does sound like the worst airport, mainly bec. of all the harassment by people. If you could have just sat on the floor and not been bothered, it wouldn't have been quite THAT awful...