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it s the top of the hour on cnn newsroom. i m alisyn camerota. i m victor blackwell. good to be with you. more than 8,000 flights have been delayed just today after the faa made a rare move in the ground of safety. they grounded flights to work out major flights in a messaging system. pilots use this system to learn about safety hazards in realtime. somewhere overnight, there was an issue with irregularities in the messages that were going out that reflected a bigger systems issue, and this morning at about 7:00, there were still problems validating that the messages were going out. so for safety reasons to make sure that every aircraft that took off was doing so safely, faa implemented a ground stop. secretary buttigieg said it s still not clear what caused this system failure, but it does not appear to be a cyberattack. what is clear is the ripple effect for thousands of passengers so let s bring in cnn s adrienne broaddus. what are passengers telling you, adrienne?

Alisyn camerotaCnn newsroomVictor blackwellThe systemMessaging systemSafety hazardsSystems issueSafety reasonsSystem failureSecretary buttigiegGround stopRipple effectAdrienne broaddusNorthern californiaInformation boardChicago o hare