A network crash grounded every flight in the US, only the third time in history

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Ripple effect: Most airport meltdowns start with a storm or a single airline's IT going sideways. On Friday, it was the network underneath US air traffic control itself. The FAA halted every departure in the country for more than four hours after that network crashed, reportedly right after a software update.

On Friday alone, more than 4,700 flights were canceled and around 10,000 delayed, according to Flightradar24 data cited by Reuters. It's only the third nationwide ground stop in US history, after 9/11 and the 2023 NOTAM outage.

Oddly enough, that one also began with maintenance work, when a contractor accidentally deleted files while syncing two databases.

The network in question is the FAA Telecommunications Infrastructure, or FTI, which defense contractor L3Harris runs for the agency. It ties every tower, radar site and...

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