Analysis: The US Department of Transportation's deadline for a decision on taking action about Dublin Airport's passenger cap arrives next week
Dublin Airport’s passenger cap is creating some time-dependant unease at present. Planning approvals back-dated from 2007 imposed a ceiling of 32 million passengers per annum, but a record breaking 36.4 million passengers passed through the airport last year. In June 2025, Fingal County Council issued an enforcement notice to the operators of the airport giving them two years to comply with planning conditions about passenger numbers imposed by An Bord Pleanála.
However, this causes an issue for airlines and their profits. Legal proceedings were taken at the EU Court of Justice by a number of airlines, as they believe their rights as per the EU-US Open Skies Agreement are in dispute.
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From RTÉ Radio 1's News At One, the Government has approved draft legislation to end the passenger cap at Dublin airport
But next week sees the arrival of an important deadline in the shape of a cut-off date of 6 May for the US Department of Transportation to act on a complaint against Ireland and the EU around the Dublin airport cap. If the US decides to retaliate, this could cause issues for many airlines, including Aer Lingus, the only Irish airline operating flights to the US.
How did we get here?
It was not supposed to be an 'eternal’ cap of 32 million passengers at Dublin. The planning permission for Dublin Airport’s expansion was pre-condtioned as such. Before this, the airport managed only 23m passengers per year till 2007, when the go-ahead for Terminal 2 construction was given.
Exponential growth can be seen in traveller numbers: an enormous 46% increase since 2015, with 36.4 million in 2025 from 34.6 million in 2024 and 23 million in 2007.
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From RTÉ Radio 1's Drivetime in June 2025, Fingal County Council has issued an enforcement notice to the operators of Dublin Airport for breaching the cap of 32 million passengers a year
In February 2026, the Government approved drafting of the Dublin Airport (Passenger Capacity) Bill 2026 with the intent to permanently scrap the cap. September is the "possible" timeline for the bill to be law, per Minister of Transport Darragh O'Brien.
US repercussions
Irish passengers are looking at a potentially grim picture. If action is taken by the US, Aer Lingus's transatlantic routes could be the target and the numer of flights to major US cities reduced. Passengers would be forced to fly via Amsterdam, Paris or London if the US forces a complete lock-down of Aer Lingus direct operations to the states as worst case scenario.
Fares would rise as the remaining airlines would increase prices automatically as soon as Aer Lingus is not flying those routes. Not the best of situations for the airline to be in as annual profits are facilitated by summer earnings.
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From RTÉ Radio 1's News at One, the Oireachtas Transport committee hears from community groups opposed to the lifting of the passenger cap at Dublin Airport
Is there an Irish solution?
It’s an ‘up to ninety’ situation for the Government. Minister for Transport O'Brien has said Dublin Airport is both ‘a critical employer’ and ‘critical national infrastructure’. A September enactment would not be good enough and too late as 1 October is the deadline for the Dublin airport capacity declarations for the next year by air carriers. Similar statements were given to the Oireachtas Committee on Transport by reps for the International Air Transport Association (IATA), Airlines for America, Ryanair and Aer Lingus.
For the US to back down, Ireland needs to bring something significant to the table. For example, US overflights continue through Irish airspace and US military traffic access to Shannon airport is already happening.
What could this mean for summer holidays to the US?
The instant crunch will be averted if the US retracts the deadline or kicks the can down the road again, but the latent challenge will still be there. US aviation connections are a big issue for Ireland: more than more than two million passengers were processed at US immigration and customs pre-clearance in Dublin airport in 2025.
Despite all the talk of open skies and free competition, aviation is also affected by politics and travellers will be caught in the disruption
Should the US take action, we could see restrictions on transatlantic routes operated by Aer Lingus, higher airfares from US airlines, the use of Eurpean and UK airports as connection hubs and a lot of last minute anxiety over flight plans for holidaymakers.
Despite all the talk of open skies and free competition, aviation is also affected by politics and travellers will be caught in the disruption. It’s a game of give and take and we'll see the amount of patience th eUS has with this issue next week.
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The views expressed here are those of the author and do not represent or reflect the views of RTÉ
