Travel What is the NOTAM system? The FAA outage causing flight delays across the US, explained. January 11, 2023January 11, 2023 Wyatte Grantham-Philips, USA TODAY Comments Off on What is the NOTAM system? The FAA outage causing flight delays across the US, explained. The FAA said a NOTAM system outage led to flight delays nationwide Wednesday morning. Here's what to know about the system – and what it stands for.