NOTAM outage was caused by accidental file deletion, says FAA

Thousands of flights across the US were canceled on January 11, when the Notice to Air Missions (NOTAM) system of the Federal Aviation Administration (FAA) suffered an outage. Now, the agency has claimed that contractors working on NOTAM accidentally deleted files, leading to a nationwide grounding of planes. Notably, this halt to air travel was the first of its kind since 9-11.