GPS interference caused the FAA to reroute Texas air traffic. Experts stumped

The Federal Aviation Administration is investigating the cause of mysterious GPS interference that, over the past few days, has closed one runway at the Dallas-Fort Worth International Airport and prompted some aircraft in the region to be rerouted to areas where signals were working properly. The interference first came to light on October 17 when the FAA issued an advisory warning  flight personnel and air traffic controllers of GPS interference over a 40-mile swath of airspace near the Dallas-Fort Worth airport. Fine-grained tracking of the interference suggested that military operations—the most common source of unintentional interference—weren’t playing a role.