Well-loved NOTAM System Will Be Officially Shut Down on Saturday, April 18
The NOTAM system that caused the first nationwide groundstop since 9/11 is officially going offline… and we’re all hoping its replacement actually does a better job. The changeover will take place between midnight and 4:00 am on April 18.
In those four hours, the 1985 US NOTAM System (USNS) will go dark and fully transition to its replacement: the NOTAM Management Service (NMS). From that point forward, all NOTAM data distributed through FAA channels and third-party providers will come straight from the new system.
The motivation for the overhaul is major. The legacy system has suffered repeated outages, most visibly in January 2023 when a corrupted file caused the entire system to crumble, triggering a nationwide ground stop that delayed over 10,000 flights and canceled more than 1,300.
This, on top of several other slightly less destructive incidents, finally pushed the FAA to accelerate development of a modernized system in 2025. The brand-new NMS, which finally launched to initial adopters late last September, is cloud-hosted, built with scalable infrastructure, and designed for higher resiliency. It brings legacy systems together into a sole source for NOTAM distribution and hopes to facilitate near-real-time data exchange.
Operators aren’t expected to see much of a change on the surface. The FAA says there will be no difference in NOTAM formatting and no interruption in distribution. Existing NOTAMs issued before the maintenance window will remain available during the cutover. The new interface allows users to search, filter, and sort notices, but the FAA does not prioritize them automatically. Unfortunately, that means the firehose is still a firehose.
The FAA claims that the main difference is improved redundancy and long-term reliability, which was the ultimate dream after years of system instability. Whether it actually improves usability is another question, especially since very few of the FAA’s updates give real details about what’s getting changed.
