In case anyone is inbound to ATL:
Here is how the day is unfolding:
2:10 p.m.: The SkyTrain from the airport to the rental car center is currently down, said airport spokesman Reese McCranie.
There is no estimated time for the train to restart, and the airport is using buses to get travelers to the rental car area.
Link -
AJC.com - Airport SkyTrain to rental car center currently down (2:19 p.m Monday, Dec. 18, 2017)