OpsGroup, the organisation behind that guide is also worth mentioning. It's a self-organised advocacy organization for flight operations personnel. Apparently t

OpsGroup, the organisation behind that guide is also worth mentioning. It's a self-organised advocacy organization for flight operations personnel. Apparently they have a longstanding campaign to reform the NOTAM system (as explained in the guide). They also have a summary of today's incident: https://ops.group/blog/us-flights-delayed-after-notam-system-failure/ https://ops.group/blog/us-flights-delayed-after-notam-system...