Official statements from the Department of Homeland Security, Transportation Secretary Sean Duffy, and FAA Administrator Bryan Bedford attribute the November 13, 2026, nationwide FAA ground stop to legacy copper-wire telecommunications equipment and routine contractor maintenance that overloaded routers during a fiber upgrade at a remote facility. Multiple agencies, including the FBI, have reported zero evidence of a cyberattack, foreign involvement, or malicious activity, with investigations focusing instead on aging infrastructure and possible installation issues. This rapid, consistent identification of a non-adversarial technical cause underpins the 99.3% implied probability against Iran attribution. Ongoing probes could still surface new data or claims, though none have emerged to date.