Was it a hack?

UPDATE 2-U.S. investigating FAA outage, cause not clear -Biden



WASHINGTON, Jan 11 (Reuters) - President Joe Biden has ordered an investigation into an FAA system outage that grounded flights across the country Wednesday morning and said the cause of the failure was unknown.

Biden told reporters at the White House he had spoken to Transportation Secretary Pete Buttigieg and they should have a good sense in a couple of hours of what triggered the outage.