Atlanta's Hartsfield-Jackson airport restores power after crippling outage
http://edition.cnn.com/2017/12/17/us/atlanta-airport-power-outage/index.html
It's convenient to use air service in United States. But, once sudden disruption of air transportation happens, transportation in the country will soon be paralyzed, due to poor alternative transportation modes.
If you travel between short distance or travel in North East Corridor, it won't be a serious problem.
But, in the other cases, it's difficult to find out alternative transportation.
So, US should think about expanding ground transportation networks.