Ireland's long-running fight over how many passengers Dublin Airport may handle each year took a decisive turn on Thursday, when the Court of Justice of the European Union ruled that the airport's 32 million passenger annual cap can be built into the rules that govern airline slot allocation.
In a judgment published on 15 October 2026, the Luxembourg court answered questions referred by Ireland's High Court in a challenge brought by airport operator daa and airlines. The judges held that a binding planning condition that restricts an airport's operational capacity must be reflected in the coordination parameters used to decide how many flights can be scheduled.
Slots are not a property right
Airlines had argued that historical slots β series of take-off and landing times they had used regularly in previous seasons β could not be pared back because of the passenger limit. The court disagreed. It said such slots are temporary authorisations and have not been definitively acquired, so they do not constitute a right to property under the EU Charter of Fundamental Rights.
"The taking into account of a passenger limit may exceptionally result in some series of historic slots, or components thereof, not being reallocated to airlines which would otherwise in principle be entitled to them," the court said, according to reporting by RTΓ and the Law Society Gazette.
The ruling also said it is immaterial whether the urban-planning rule is long-standing or whether the policy behind it has evolved. What matters is that the limit restricts capacity that is actually available and must be complied with by the airport operator.
How Dublin reached the ceiling
The 32 million passenger cap stems from a 2007 An Bord PleanΓ‘la planning decision attached to terminal development at Dublin. For years the limit had little practical effect. In 2024 the Irish Aviation Authority began applying seasonal seat caps so that coordinated schedules would stay inside the annual ceiling, and some historical slots could not be fully reallocated.
That approach triggered the High Court litigation and the reference to Luxembourg. An Advocate General opinion in February 2026 had already pointed in the same direction as Thursday's judgment.
Politics may still lift the cap
Even as the court backed the regulator's ability to respect the planning condition, Irish politics is moving the other way. Legislation signed in July gives Transport Minister Darragh O'Brien power to change the passenger limit. He has said he hopes to lift the cap as soon as possible after an environmental assessment.
Dublin Airport operator daa said the judgment was consistent with the Advocate General's earlier view and brings much-needed clarity to the various regulatory regimes impacting aviation in Ireland. The case now returns to the High Court, which will apply the EU court's guidance to the domestic dispute.
For airlines planning summer and winter schedules at Europe's constrained hubs, the message is blunt: historic use helps, but it does not freeze capacity when a lawful operational limit is in force.
Sources: RTΓ, Law Society of Ireland Gazette, Irish Examiner, Court of Justice of the European Union.
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