Regional airline schedules were disrupted late Saturday and into Sunday by ADS-B and GPS issues that seemed to affect mainly Bombardier CRJ aircraft. According to various sources, the disruption briefly grounded entire fleets of regional jets and the resulting delays and cancellations rippled through the system. A random selection of airport arrival and departure boards showed most flights on time by midafternoon EDT on Sunday, except for some weather delays in the Southeast.
The origin of the issues remains unclear but affected the ADS-B and GNSS systems on the affected aircraft. Mainline aircraft seemed to be unaffected by the problems. The problems seemed confined to the western U.S. and the FAA reportedly asked the military to cease any GPS jamming tests they might be conducting.