FAA says ‘ground stop has been lifted’

The FAA tweeted the following update: "Normal air traffic operations are resuming gradually across the U.S. following an overnight outage to the Notice to Air Missions system that provides safety info to flight crews. The ground stop has been lifted. We continue to look into the cause of the initial problem" Publicly traded airlines include Alaska Air (ALK), American Airlines (AAL), Delta Air Lines (DAL), JetBlue (JBLU), Southwest (LUV), Spirit Airlines (SAVE) and United Airlines (UAL). Reference Link