WASHINGTON/CHICAGO, Jan 12 (Reuters) - U.S. airline operations returned to normal on Thursday even as the Federal Aviation Administration (FAA) continues to investigate pinpoint the cause of a computer outage that grounded flights nationally and to prevent it from happening again.
"FAA operations are back to normal, and we are seeing no unusual delays or cancellations this morning," the FAA said in a tweet.
More than 11,300 flights were delayed or canceled on Wednesday in the first national grounding of domestic traffic in about two decades.
As of noon Thursday, 1,400 U.S. flights were delayed and 117 were canceled, according to FlightAware, a typical aviation day given current weather issues.
Major carriers Delta Air Lines (DAL.N), United Airlines (UAL.O), American Airlines Group Inc (AAL.O) and Southwest Airlines (LUV.N) all were reporting normal operations on Thursday.