Atlanta Hartsfield-Jackson Airport (ATL)

The spine: two terminals, seven concourses

The Domestic Terminal sits at the west end, split into a north half and a south half with their own curbs, check-in halls and baggage carousels. The International Terminal stands at the far east end, behind the last concourse. Between the two run concourses T, A, B, C, D, E and F in alphabetical order, which is the single most useful fact about the building: a gate letter tells you exactly how far east you are.

Airside, the Plane Train runs the length of that spine and calls at every concourse. Parallel to it, in its own tunnel, is a flat pedestrian corridor with moving walkways and a rotating art collection along the walls — between neighboring concourses, walking is often the quicker choice and always the better one. Landside there is no walk at all between the two terminals: they face opposite sides of the airfield, and a shuttle bus is the only link.

Into Atlanta: the rail line under the Domestic Terminal

Atlanta is one of very few Sunbelt cities where the airport has heavy rail rather than a shuttle bus, and the station is inside the Domestic Terminal itself — down the escalators past baggage claim, no transfer, no curb. Two lines share the track north through downtown and Midtown before they split, which covers most of where visitors actually stay, and they run often enough that a timetable is rarely worth consulting.

The catch belongs to international arrivals: the station serves the Domestic Terminal only, so landing at the other end of the airport means taking the shuttle bus across first. Taxis work on a flat fare between the airport and the downtown, Midtown and Buckhead zones rather than a meter, set by city ordinance and posted at the rank. Ride-hailing collects from its own marked area, reached by following signs rather than by walking out of the nearest door.

Connecting: what the busiest airport asks of you

Most people here are changing planes, and the airport is built around that. Domestic to domestic you never leave the secure side, and the train makes even a move across the whole spine a short one. The dominant hub carrier works the south half and the western concourses; the other airlines cluster in the north half and further east. Arrivals and departures come in waves, and the security lines swell and empty with them rather than holding steady through the day.

Arriving from abroad is the longer version. Immigration and customs are cleared at the eastern end, and anyone continuing on a domestic flight drops checked bags back onto a belt and passes through screening again before rejoining the train. Which travelers can use the automated kiosks, and what a given nationality needs in hand before boarding at all, is a question for the entry rules of the United States rather than for the airport.

Layovers, and the one thing the airport does not have

A long layover here is genuinely usable because the train goes downtown, and genuinely awkward because there is no left-luggage counter anywhere in the building — whatever you carry out, you carry all day. Airside, the art corridor between the western concourses is the closest thing to a walk worth taking, and the food is better than the airport's scale would lead you to expect. Paid lounges and the hotels along the access road cover a broken connection.

Onward: cars, the SkyTrain and the drive out

Rental cars live in a shared center away from the terminals, reached from the Domestic Terminal on the SkyTrain — a second, separate people mover that runs landside to the east. From the International Terminal it is a bus instead. Returning a car, allow for the fact that the return lanes and the check-in hall are not the same building, and that the transfer is a ride rather than a walk.

Driving out puts you onto the perimeter highway that rings the metro, congested at both peaks and the reason many visitors skip the car entirely for a city stay. For real distance the flight board is Atlanta's advantage: short hops reach the whole Southeast, the music cities north and west among them, and the broader logic of driving and flying across the country applies from here as anywhere.

Practical: connectivity, screening and family travel

An eSIM switched on as you land saves hunting for a counter that does not exist here, and the free airport wireless is enough to get one running if you leave it late. Three checkpoints screen the Domestic Terminal — a large central one and smaller north and south lanes that are often quieter for the same flight. Nursing rooms, service-animal relief areas and a pet park are marked on the terminal maps rather than announced.