What is a NOTAM?

Purpose of NOTAMs

NOTAMs alert flight crews and dispatchers to conditions that may affect safety: closed or shortened runways, unserviceable navaids, temporary airspace restrictions, obstacles, VIP movements, fuel availability, and procedural changes. They are filed through national NOTAM offices and distributed internationally in ICAO format.

Unlike permanent chart updates, NOTAMs address temporary or short-notice changes. They are a core component of pre-flight briefing alongside weather, charts, and company operations specifications — but briefing products only show active NOTAMs unless you query a historical archive.

NOTAM lifecycle

A NOTAM is issued with effective start and end times (or permanent status until cancelled). While active, it appears in briefing products. After expiry or cancellation, it disappears from operational feeds — which is why archive services such as NOTAM History exist for retrospective lookup by ICAO and date.

Investigators and lawyers often need to prove not merely that a condition existed, but that it was officially published. Archive retrieval returns the NOTAM text as active on the requested date, supporting comparison with crew and dispatch records.

Common NOTAM categories

Categories are encoded in ICAO format fields (including Q-lines) that specialists parse routinely. For field-level detail, see ICAO NOTAM format. SNOWTAMs cover runway surface contamination separately; see NOTAM vs SNOWTAM.

• Runway, taxiway, and apron closures or limitations
• Navaid, lighting, and approach procedure status
• Airspace restrictions, TFRs, and special activity
• Obstacles, cranes, and construction near aerodromes
• Services: fuel, handling, ATS, and communication changes

Retrieving old NOTAMs

When a NOTAM is no longer active, FAA NOTAM Search and most EFB apps will not show it. NOTAM History queries an archive for the NOTAMs active at a 4-letter ICAO location on a date up to approximately two years in the past. The service is for documentation and analysis — not pre-flight briefing.

Professional users include accident investigators, aviation lawyers, insurers, safety officers, and operators. Pricing starts at €9.99 per search; subscriptions and top-ups are available for regular archive access. See historical NOTAMs for the full workflow.

NOTAMs in the safety and legal ecosystem

Regulatory frameworks treat NOTAMs as part of the aeronautical information required for safe operations. Failure to comply with published restrictions can factor into enforcement, certificate action, and civil liability analysis.

NOTAM literacy varies across organisations. Safety officers may need to explain to non-aviation stakeholders why a disappeared NOTAM still matters and why expired NOTAMs require archive retrieval.

Historical NOTAM access via NOTAM History supports that evidence function: ICAO plus date, email delivery, approximately two years of archive depth — explicitly not for replacing current briefing before flight.

Professional use summary

NOTAM History delivers archived NOTAMs by ICAO aerodrome or FIR and historical validity date, with approximately two years of archive depth via professional aviation data APIs. Pricing: €9.99 one-off, €29.99/year (ten searches), €29.99 top-up. Email output uses ICAO plain-text format for investigators, lawyers, insurers, safety officers, and operators. Not for pre-flight briefing — use FAA NOTAM Search or approved operator systems for current US and international operations before flight.

NOTAM History queries professional archive APIs by 4-letter ICAO aerodrome or FIR code and historical validity date, returning ICAO plain-text NOTAM output by email within seconds. Archive depth is approximately two years where supported. Pricing is €9.99 per one-off search, €29.99 per year including ten searches, or €29.99 top-up packs. The service is designed for investigators, aviation lawyers, insurers, safety officers, and operators who need expired NOTAMs no longer shown on FAA NOTAM Search or briefing apps — and is not for pre-flight operational briefing.