EUROCONTROL has published its FlashBriefing on summer performance. The good news: The European aviation network showed significant improvement compared to 2024’s season. Air traffic flow management (ATFM) delays dropped by 27% from 5.4 to 3.9 minutes per flight and arrival punctuality increased by 6.5 percentage points from 65% to 71%. However, when compared to pre-pandemic levels, the picture becomes less convincing: delays remain still 8% higher than 2019 per flight, while punctuality is still 1.5 percentage points below 2019’s 72.5%.
Beyond the numbers lie a revealing divergence in how Europe’s aviation industry interprets performance in summer 2025.
Summer 2025 performance highlights
Summer 2025, covering the months June – August, recorded 35,122 average daily flights, representing 3% growth compared to 2024 but only 1% above 2019. The network experienced two traffic records ever: the busiest weekend, in early August and the busiest week ever in Week 35, 25-31 August, with 250,291 total flights.
Examining the data more closely reveals that much of the 2025 versus 2024 delay reduction came from a 43% decrease in weather-related disruptions—an external benefit that cannot be primarily attributed to stakeholder coordination efforts, notwithstanding the success of mitigation activities.
Not only weather but all delay factors declined: en-route delays dropped 34% across all categories, with capacity delays down 30%, staffing delays reduced 22%, and weather delays falling 43%.
Significant regional performance disparities
Traffic growth was unevenly distributed across Europe, as were the performance results. Traffic increases exceeding 5% occurred on South East and South West European axes, with some corridors experiencing over 20% growth, creating significant operational challenges for Air Navigation Service Providers (ANSPs).
En-route ATC capacity delays, while reduced by 25% to 1.4 minutes per flight, remain concentrated on Barcelona, Marseille, and Karlsruhe centres. Staff availability issues persisted, with ATC staffing delays at 0.4 minutes per flight, however 25% less than 2024. The concentration of delays in French airspace continued as well, with DSNA, Marseille ACC, and Reims ACC frequently cited as primary delay sources affecting network-wide efficiency.
Stakeholder perspectives: exclusive industry feedback
All stakeholders participated in EUROCONTROL’s #thinkNetwork campaign, to anticipate and mitigate potential delay route causes. All adhered to the preparation work and consistently praised the collaboration efforts following the summer. Nevertheless, their exclusive assessments of summer 2025 reveal some different interpretations of the same performance data.
ANSPs: resilience under challenging conditions
The Civil Air Navigation Services Organisation (CANSO) emphasises the context in 2025, focusing on improvements compared to 2024. CANSO’s Director Europe Enrico Parini explains: “Summer 2025 was always going to be difficult for the European aviation network, with traffic returning to pre-COVID levels in an airspace that is 20% smaller due to the Ukraine war. We are pleased to see that the network delivered better performance despite the increase in traffic, as reflected in the delay figures.”
Parini accentuates the role of the ANSPs and the success of collaborative efforts: “CANSO members played a significant role in this improvement thanks to prior preparation and deployment of measures to optimise capacity, as well as close collaboration with other stakeholders,” with the outlook: “we will review the summer performance with our members to see how they can continue to deliver their services to match future traffic growth.”
Airports: operational partnerships worked
ACI Europe underlines airports’ active role in network improvements while identifying ongoing challenges. Aidan Flanagan, Director of Airport Capacity & Operations, comments: “Summer 2025 has seen the European ATM network perform better than last year, even against an average traffic increase of 3–4%. Airports have played a central role in this improvement, fully embracing the Network Manager’s #thinkNetwork campaign, with a clear focus on first wave departures.”
From the airports’ perspective, the operational constraints still remain: “Despite progress, flights arriving either too early or too late continue to pose challenges for smooth airport operations. This is an issue that must be addressed at network level before the next summer season.”
Airspace users: negative passenger impacts still significant
The airline association AirlinesForEurope (A4E) acknowledges successes compared to the prior year while challenging the attribution of improvements. Rania Georgoutsakou, Managing Director A4E, points out: “This summer, 110 million travellers lost 12.7 million minutes, or 24 years, to delays. Performance was not as bad as 2024, the worst summer in 25 years, but more than half of the reduction came down to favourable weather rather than structural progress. En-route delays remain over three times higher than the EU target.”
While it is essential for A4E to learn from the successful operational cooperation for summer 2026, “we need to analyse which measures really worked, maintain and replicate those that were effective”, the association continues to call for fundamental changes. Georgoutsakou reinforces the airspace user expectations: “We cannot continue to patch up Europe’s airspace. We need meaningful reform to tackle the root causes: hire more air traffic controllers, roll out technology, and modernise our airspace.”
Key Takeaways
1. Collaboration remains the defining theme of 2025: No public blame game took place during the summer season or afterwards. This is a success in itself for a community too often prone to public criticism.
Summer 2025 successfully demonstrated that industry-wide coordination through initiatives like the #thinkNetwork campaign can deliver measurable operational improvements, with all stakeholders acknowledging the value of enhanced planning and communication throughout the year.
2. Attribution remains contested: While ANSPs credit systematic coordination for performance gains, airlines argue that favourable weather conditions accounted for more than half of the improvement. In reality, both perspectives hold merit – the improvements resulted from multiple factors working in conjunction. However, future summers cannot rely on weather conditions being as cooperative as they were in 2025.
3. Structural capacity gaps persist: European ATM performance (1.84 min/flight) continues to exceed EU targets (0.9 min) by over 100%. A clear signal that coordination measures cannot substitute for fundamental capacity expansion, including controller recruitment and infrastructure modernisation.
After the summer is before the summer
Rania Georgoutsakou concludes: “Temporary fixes and favourable weather conditions cannot be the benchmark. We need to address the root causes of Europe’s persistent capacity and staffing problems. To prepare for 2026, stakeholders must quickly identify which measures genuinely worked and replicate them.”
This aligns with the EUROCONTROL FlashBriefing. The report provides many details on bottlenecks as well on improvements achieved. Beyond lessons learnt from coordination in 2025, it is calling for action on strategic measures: They include airspace modernisation, implementation of sectorisation changes, acceleration of digitalisation, increased datalink usage, and continuous ATCO recruitment.
Passengers can hope for successful preparation for summer 2026. Operational stakeholders are ready.
