• The FAA has grounded all flights in the US due to an air traffic control communications failure.
• The nationwide ground stop affects all airports, including LAX and Hollywood Burbank.
• The cause of the failure is still unknown, but it may involve both communications and radar problems.
• Flights already in the air are being allowed to continue to their destinations.

This unprecedented ground stop may indicate significant vulnerabilities in the US air traffic control system, which could have major implications for the aviation industry and national security. The failure may also suggest a need for increased investment in air traffic control infrastructure and cybersecurity measures.