Yes, Hartsfield-Jackson Atlanta International Airport in Georgia (ATL), United states of America, is open 24 hours and travelers can access the public concourses of both the domestic and the international terminal any time.
The security checkpoints at the main domestic terminal also work 24 hours a day, although those on the south and north domestic concourse and the international terminal have opening hours that range from 3:30 am to 12:00 am daily.
If you wish to stay in Atlanta airport overnight, you can book a room in one of the transit hotels below:
Sonesta Atlanta Airport South (3 stars)
Wyndham Garden Atlanta Airport (3 stars)
La Quinta by Wyndham Atlanta Airport South (3 stars)
Renaissance Concourse Atlanta Airport Hotel (4 stars)
Yes, Hartsfield-Jackson Atlanta International Airport offers WiFi connection at no cost for all passengers. In order to enjoy this service, select their wireless network on your device, open your browser and complete a brief registration form.