Busiest yet somehow it works
The underground train between concourses moves you across this enormous place faster than you'd expect.
Security lines at peak morning hours can eat a chunk of your buffer time.
For the airport that handles more passengers than any other, Atlanta keeps things surprisingly orderly. I connected here on a tight itinerary and the train had me at my next gate with time to spare. It's not glamorous, but it is efficient, and that's what I want when I'm working.