The system has been around for more than a half century and it has evolved from paper to computers. It's in the process of being updated.
People check into their flights at Harry Reid International Airport, Wednesday, Jan. 11, 2023, in Las Vegas. The world's largest aircraft fleet was grounded for hours by a cascading outage in a government system that delayed or canceled thousands of flights across the U.S. – Until Wednesday, few travelers had ever heard of a Notice to Air Missions, or NOTAM, nor did they know that the system used to generate those notices could cause widespread travel misery.
The system stopped working at 8:28 p.m. Eastern time on Tuesday, but because there weren't many departures at that hour, pilots were able to get the information verbally. At daybreak in the East, the system was still out, and there were too many flights leaving to brief pilots individually. “We will not allow anything to take place that is not safe,” Buttigieg told reporters. “This is precisely why our focus right now is on understanding, identifying and correcting anything related to the root cause of how this happened in the first place.”
Other FAA technology also is aging, Campbell said. “So much of their systems are old mainframe systems that are generally reliable but they are out of date,” he said. Major airlines including Delta, American, Southwest and United were waiving change fees for Wednesday flights — and, in some cases, Thursday flights — to make it easier for passengers to change their travel plans.
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EXPLAINER: How NOTAM caused widespread flight disruptionsUntil Wednesday, few travelers had heard of a Notice to Air Missions, or NOTAM
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