What Are NOTAMs? — Notices to Air Missions Explained
NOTAMs (Notices to Air Missions) are alerts the FAA issues to pilots about conditions that affect flight safety — runway closures, equipment outages, airspace restrictions, and more. Here's what they mean for you as a passenger.
NOTAMs that affect passengers
Runway closures
Reduces the airport's capacity. If an airport normally handles 60 arrivals/hour across 3 runways, closing one drops it to ~40. This cascading bottleneck causes delays system-wide.
Taxiway closures
Planes take longer routes between the runway and the gate. Adds 5-15 minutes to your taxi time — noticeable on departure and arrival.
ILS / navigation outages
When the Instrument Landing System (ILS) is down, pilots may need to use backup approaches. In good weather, no impact. In fog or low clouds, this can significantly slow arrivals.
Temporary flight restrictions (TFRs)
Airspace closures for VIP movement, sporting events, or emergencies. Usually reroute flights around the area — minor delay impact unless near your airport.
NOTAMs that don't affect passengers
- Obstacle NOTAMs — new crane or tower near the airport. Pilots adjust their routes; you won't notice.
- Lighting NOTAMs — approach lights or taxiway edge lights out. Pilots use alternate references.
- GA-only closures — airport closed to general aviation but open to commercial flights.
- Military/NOTAM D — distant airspace restrictions that don't affect your route.
Reading a raw NOTAM
!JFK 10/051 JFK RWY 04L/22R CLSD 2610211400-2610281400
This says: JFK Runway 4L/22R is closed from Oct 21 at 14:00 UTC to Oct 28 at 14:00 UTC. Flight Check's ATC View automatically decodes these into plain English — for example: JFK ATC View.