Federal Aviation Administration head Billy Nolen says "the system works as its designed" following last month's shutdown.
RELATED: What caused the FAA outage? Why experts think old tech may play a role
Congress continues to demand answers following last month's shutdown of the national airspace resulting from a computer system issue at the Federal Aviation Administration.
More than 10,000 flights in the U.S. were delayed or canceled as a technical failure forced the FAA to pause departures nationwide for about 90 minutes on the morning of Jan. 11.
"A preliminary FAA review of last week’s outage of the Notice to Air Missions system determined that contract personnel unintentionally deleted files while working to correct synchronization between the live primary database and a backup database," an FAA statement on preliminary findings said.
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It is the same system that was in place during the last many administrations.
Hire more employees.