'Root cause’ of nationwide ground stop is unknown, FAA says

The root cause of the longest halt in flight departures to U.S. airports since 9/11 remains unclear after a Saturday press conference by U.S. transportation officials. Routers and networking equipment appeared to be involved in the technological disruption that grounded flights across the country, but a definitive cause has not been established as of Saturday afternoon. The inability to pinpoint the reason for the infrastructure malfunctions led the Federal Aviation Administration to take actions that resulted in the grounding order, Bryan Bedford, administrator of the Federal Aviation Administration, told reporters.