A computer outage that grounded flights nationally on Wednesday and disrupted more than 11,000 flights was caused by a procedural error related to a data file, the Federal Aviation Administration said on Thursday as U.S. airline operations returned to normal.
The FAA said its preliminary analysis "determined that a data file was damaged by personnel who failed to follow procedures. The system is functioning properly." The FAA did not answer more questions about the specifics of the problem.
