EU Court upholds Dublin Airport’s 32 million-passenger cap, putting squeeze on future airline slots

In a judgment issued in Luxembourg on 15 October, the Court of Justice of the European Union (CJEU) ruled that the 32 million-passenger cap contained in Dublin Airport’s 2007/08 planning consents constitutes a ‘technical, operational or environmental constraint’ that the Irish coordinator must take into account when allocating take-off and landing slots. The case was referred by Ireland’s High Court after daa plc, the airport operator, argued that historical slot rights should not be reduced solely because the passenger ceiling had been breached by post-pandemic travel demand. Airlines, led by Ryanair and Aer Lingus, claimed that the limit was anachronistic, pointing out that Dublin handled 34 million travellers in 2025 without major operational issues. The CJEU rejected that position, confirming that Member-State regulators can impose or respect capacity ceilings where they stem from valid development consents designed to mitigate environmental impact. Practically, the decision means that Ireland’s Commission for Aviation Regulation (soon to be folded into the new Irish Aviation Authority structure) may have to claw back slots for the summer-2027 scheduling season unless the Government succeeds in passing emergency legislation to raise or remove the cap. The ruling also weakens airlines’ legal leverage in ongoing commercial negotiations over charges and stand allocation. daa has already warned that its €2 billion Capital Investment Programme to add a third terminal could stall if the cap remains. For the multinational sector, any slot squeeze could trim the number of early-morning transatlantic departures prized by business travellers and hamper Ireland’s connectivity drive, a cornerstone of the National Enterprise Strategy. Travel-managers should prepare for tighter seat availability and potentially higher fares on peak routes to London, New York and continental hubs. In the short term, slot coordinators must complete the Initial Slot Allocation by 31 October. Airlines holding ‘historic’ slots will now have to demonstrate that their planned utilisation keeps overall passenger throughput within the 32 million threshold or face reallocation under the EU Slot Regulation’s “use-it-or-lose-it” rule.