86 aircraft were affected by an incident in Denver ,and 256 more in Dallas-Fort Worth, America's Federal Aviation Admistrationtold the Washington Post:
The pilots flying into Denver International Airport could tell something was wrong. In urgent calls to air traffic controllers, they reported that the Global Positioning System was going haywire, forcing them to rely on backup navigation systems for more than a day. The Federal Aviation Administration issued a warning to air traffic in the area. Eight months later, in October 2022, it happened again — this time at Dallas-Fort Worth International Airport, which shut down a runway as pilots and air traffic controllers scrambled over two days without GPS to guide them. Federal officials have not said who was responsible for interfering with the systems or why it took so long to get them back online, though they've said the Denver incident was unintentional. But the disruptions stoked fear about the security vulnerabilities of GPS, a satellite network relied on daily by 6 billion people, businesses and governments.
Over the past two years, interference with the U.S. Global Positioning System has grown dramatically, threatening a network that is highly vulnerable to attack in a conflict. The danger could be posed by enemy or rogue nation-states — or even just hobbyists with commercially available equipment. Efforts by the Pentagon to upgrade GPS have been delayed by years and have cost billions, as adversaries are developing increasingly sophisticated ways to jam and trick the system with false signals that make it think it is somewhere it isn't. And it's not just civilian airline traffic at risk. The underpinnings of modern life and entire economies could be disrupted by a broad attack on the fragile satellite system — power grids, financial systems, cellphone networks — raising the prospect of catastrophe in an era of increasing electronic warfare...
A report last year by the OpsGroup, an organization of international airline operators, found that in January 2024, about 300 flights per day were affected by GPS interference. By late last year, that number had grown to 1,500 flights per day as conflicts in Eastern Europe and the Middle East continued. And in a one-month period, between July and August last year, some 41,000 flights were affected. "While GPS interference is not a new phenomenon, the scale and effects of the current wave of spoofing are unprecedented," the report found...
The Pentagon has launched eight of its next-generation GPS III satellites, which broadcast the military-grade signal that is more resistant to jamming and spoofing. Lockheed Martin, the contractor building the satellites, is also developing a next-generation spacecraft, which would have the ability to emit an even stronger "spot beam" directly to areas used by U.S. forces, making it even more difficult to jam.
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