Worst: ATL (if final destination) only because you have to recheck your bags and go through security again to leave Terminal E before going landside (although this should end in a year or two).

OUA (Ouagadougou) -- I'd say the line was long, but there was no semblance of a line. Doesn't help that the terminal is the size of a high school gym.

Best: MSP - friendly midwestern agents. Last agent asked how my trip to AMS (only spent 2 days there as a stopover) was with a wink.

NAS - pretty straightforward. 10 minutes off the plane and done.