The breakdown showed how much American air travel depends on NOTAM, the computer system that generates alerts.
Before a plane takes off, pilots and airline dispatchers must review the notices, which include details about bad weather, runway closures or other temporary factors that could affect the flight. The system was once telephone-based but moved online years ago.
After the failures were fixed, he warned that travelers could continue to see some effects "rippling through the system."Longtime aviation insiders could not recall an outage of such magnitude caused by a technology failure. Some compared it in scope to the nationwide shutdown of airspace after the 2001 terrorist attacks.
"I've been flying 53 years. I've never heard the system go down like this," Cox said. "So something unusual happened." The National Transportation Safety Board highlighted the large number of notices in its investigation of a near-disaster in 2017 in San Francisco. An Air Canada jet whose pilots had overlooked a NOTAM about a closed runway nearly landed by mistake on a parallel taxiway. They skimmed just over the tops of four other airliners waiting to take off.
"There is just a lot of frustration, a lot of confusion," said Ryan Ososki, who was trying to fly from Washington, D.C., to California for a conference.
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