Passengers were stranded at airports, planes were waiting on the tarmacs, and thousands of flights were delayed or canceled. On Friday, the U.S. national Aviation Administration (FAA) ordered an unprecedented suspension of all departures nationwide. The reason was a failure of communication and air traffic control systems. The flight ban was lifted after 4 hours, but the effects of the disruption may be felt for respective more days. LOT Polish Airlines besides issued a statement.