The FAA NOTAM Outage Lays Bare an Essential System Everyone Hates

The United States Federal Aviation Administration today halted flights taking off across the country beginning early this morning and continuing until 9 am ET. The pause—the first of its kind in the US since the September 11, 2001 attacks—delayed thousands of flights and created a cascade of further delays and cancellations throughout the day. Those familiar with the FAA’s systems say the outage is unprecedented, but caps off years of frustration as the agency works to transition its complex processes to the cloud.

The situation was caused by an outage in a critical system the FAA uses to distribute real-time data and warnings to pilots. Known as NOTAM (Notice to

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