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The FAA said the ground stop was lifted after about an hour. "Pilots never lost touch with air traffic control," the agency said in a statement.
The FAA website shows that the ground stop was issued due to a ZME Frequency Outage.
ZME is an FAA air traffic control facility in Memphis that is responsible for controlling aircraft in the area at higher altitudes.
Flight service at Nashville International Airport "continues to be impacted by telecommunications issues," a tweet from the airport said around 3:30 p.m. CT.
On Friday evening the airport said in a tweet that "most flights are resuming, but there may be some delays."
https://abc17news.com/news/national-world/2020/12/25/nashville-explosion-disrupts-flights-and-causes-att-outage/