Ireland's aviation regulator has published its most granular operational emissions baseline yet. The IAA Operational Environmental Performance of Irish Aviation Entities H1 2026, published in 2026, is Ireland's first periodic overview of CO₂ emissions and operational efficiency across air navigation services, aircraft operations, and airports. It documents 157,515 flights in H1 2026 — up 6.7% on H1 2025, ahead of the 2.7% EUROCONTROL forecast — and CO₂ emissions of 1.7 million tonnes.

The report warrants a constructive reading from the Irish aviation industry. Developed to support delivery of the IAA Statement of Strategy 2026–2028 sustainability pillar, it maps operational efficiency indicators that Irish airlines, airport management, MRO providers, and aviation technology companies can act on now — without waiting for SAF mandates or new propulsion technologies. Operational efficiency can reduce fuel and CO₂ in the short term using existing aircraft and infrastructure.

The en-route airspace efficiency data is the report's most positive finding. Ireland's Key Environmental Area (KEA) improved from 1.63% in 2025 to 1.53% in H1 2026. AirNav Ireland ranks second in Europe for en-route airspace efficiency. The national target is 1.40% — a gap the report attributes to UK free route airspace implementation and airline flight-planning changes on North Atlantic routes. Closing that gap remains a challenge for Irish aviation operations management.

The continuous descent operations (CDO) data is the most commercially significant finding for Irish airlines and airport operations. Overall CDO performance in Ireland was 40.9% in H1 2026, above the European average of 34.0%. CDO among Irish-based aircraft fell from 42.7% in 2025 to 39.3% H1 2026. Excluding Ryanair, Irish-headquartered operators average 34.9% — below the European average. Dublin Airport's complex terminal airspace is the primary constraint on airport operations CDO performance.

The report documents significant variation in airline safety and operational excellence between individual operators. At Dublin Airport, one major Irish operator achieved a CDO rate of 58.4% in H1 2026 — 21 percentage points above the 37.2% average for all others. Cork Airport ranked 12th out of 88 European airports for departure taxi time; Dublin ranked 75th. For aircraft maintenance, ground handling, and airport operations teams, taxi time is a manageable operational lever.

Three priorities follow. First, airlines with CDO rates below the European average should treat this report as a board-level aviation innovation mandate — regulator-published data, updated periodically. Second, airport management teams at Dublin should engage with the IAA's monitoring of early morning arrival holding, a source of additional fuel burn. Third, workforce development in operational environmental performance analytics should be treated as a growing professional capability requirement across the sector.

The IAA Operational Environmental Performance H1 2026 report is a genuinely new category of regulatory output for Irish aviation. It establishes a transparent, regulator-published emissions baseline against which Irish airlines, airports, and air navigation service providers will be measured. For those leading the Irish aviation industry — across airlines, airports, lessors, MRO providers, and the commercial aviation and aviation technology ecosystem — this report is both a mirror and a mandate.