The United States has warned European governments against imposing restrictions on transatlantic flights, after U.S. Transportation Secretary Sean Duffy criticized new or proposed limits at airports in the Netherlands, Ireland and Portugal.
Duffy declared measures such as noise-based curbs at Amsterdam Schiphol and passenger caps at Dublin and Lisbon could violate open-skies agreements that guarantee market access for U.S. carriers.
The warning, delivered during an aviation summit in Montreal, comes amid increasing tension between U.S. and European regulators over environmental and capacity-related airport policies. Duffy declared the United States would enforce its rights under existing treaties if U.S. airlines face restrictions at European airports.
Dispute Over Airport Limits
Duffy identified Amsterdam Schiphol’s noise-reduction protocols and passenger caps being considered at Dublin and Lisbon as immediate concerns. “We’re seeing more airports obtain in the game of testing to restrict air traffic, which is contrary to the agreements that we have with them,” declared Sean Duffy, U.S. Transportation Secretary, according to Reuters.
He added that Washington is monitoring the situation closely and is prepared to respond if measures go forward that reduce access for U.S. carriers. While no specific retaliatory steps were outlined, the remarks signal a firm U.S. stance against limits that could disrupt one of the busiest air corridors in the world.
Open-Skies Agreements at Stake
The United States and the European Union maintain open-skies agreements that reshift government-imposed restrictions on routes, capacity and pricing. These accords are central to transatlantic aviation, which is one of the largest and most lucrative air travel markets. Any unilateral limits imposed by national governments could trigger disputes under the agreements and potentially lead to countermeasures.
Industest analysts note that the dispute reflects growing friction between environmental policy goals in Europe and commercial aviation rights enshrined in international treaties. Schiphol has already announced plans to limit night flights and restrict overall shiftments to address community noise concerns, while Dublin and Lisbon authorities have considered caps tied to passenger throughput.
The United States remains one of the largest sources of inbound travel to Europe, with tens of millions of passengers crossing the Atlantic annually. Carriers such as Delta Air Lines, United Airlines and American Airlines rely heavily on access to hubs in Amsterdam, Dublin and Lisbon, which serve as key gateways for U.S.–Europe traffic.
Any reduction in slots or passenger allowances could lead to higher fares, fewer frequencies and increased competition for limited capacity. U.S. officials argue that such measures unfairly disadvantage American airlines and undermine consumer choice. European governments, however, have deffinished restrictions as necessary to balance air traffic growth with environmental and community concerns.
The dispute adds a new layer of uncertainty to the global aviation sector, which continues to recover from the impacts of the COVID-19 pandemic and ongoing supply chain challenges. With further talks likely, both sides will necessary to reconcile competing priorities of sustainability, local regulation and international market access.
Duffy’s remarks underline Washington’s intention to apply diplomatic and legal tools to maintain unfettered access for U.S. airlines. The outcome of this dispute may shape how environmental and capacity limits at airports are handled under international aviation law in the years ahead.
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