After the Federal Aviation Administration (FAA) ordered a nationwide ground stop for all departing flights Friday after a communication issue affected all Air Route Traffic Control Centers, United Airlines is issuing travel waivers to customers affected.

Cancellations are being implemented due to congestion in the nation's air traffic system, the airline said.

The airline says if your flight has been affected by the ground stop, you can reschedule your trip and the airline will waive change fees and fare differences.