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In Mexico City, the US government insists that EVERYONE be RE-inspected and their hand luggage gone through right before boarding a plane even though we've already gone through the security check. And then you have to go through security AGAIN in Houston or Dallas or wherever you are changing planes. Also, the US is the only country, if my information is correct, which does not allow people to carry their own duty-free items onto the plane. People are met at the door of the plane with what look like salespeople from the shops who hand them their stuff as they board. Mexican staff has been unfailingly courteous at all security checks I've ever gone through there, which makes it somewhat less annoying.