A widespread impact to the GPS-based ADS-B navigation system used by aircraft to communicate location and flight status with the ground led to 'hundreds or even thousands' of weekend flight cancellations in the U.S. and threatens to impact the start of the working week.
The issue seemed to be quite wide-spread, with a lot of aircraft grounded... Had this happened on a weekday, it would have been leading headlines on national news - some sort of GPS fault grounded a chunk of the U.S. commercial fleet and hardly anybody noticed."According to,"certain aircraft equipped with the Rockwell Collins GPS 4000-100 and select ADS-B out GPS receivers are indicating 'ADS-B fail, unavailable, TCAS fail or transponder fail' messages.
, regional carriers in the U.S."canceled about 400 flights scheduled for Sunday." A Delta spokeswoman said"about 80 of its regional flights were canceled," and American and United regional carriers were hit by the same issue.Canada’s Bombardier, but also some Boeing 737s, 717s and possibly a 767 as well.
There has been online speculation that military testing of GPS jamming might be responsible, although that seems to have been discounted - such tests are heavily publicized beforehand. There was also apparent confusion for some airline passengers, with disruption being blamed on the weather rather than on system issues."some updates would be nice. Y’all keep saying weather but our pilot just said the military is jamming Delta’s GPS which is why we were diverted.
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