Search and rescue teams are hunting the Adriatic Sea for the F-16 fighter jet that went missing after it left the Aviano air base in northern Italy.
More top news
Guillier conceded a "severe defeat" defeat to his supporters as the result came in.
The outage struck Hartfield-Jackson Atlanta International Airport at around 1pm local time, stopping all outgoing flights.
It will be a chilly day for many parts with the highest temperatures, about 10 Celsius (50F) in the far northwest.