Dublin Airport handles the great majority of Irish air traffic and works as a genuine transatlantic hub: Aer Lingus feeds North American flights from across Europe, while Ryanair uses it as one of its largest bases. There is no rail link, so almost everyone arrives by coach or bus from the city and beyond. US preclearance in Terminal 2 means passengers to the United States clear immigration in Dublin and land domestically on the other side.
Ireland remained in the EU after Brexit, so Regulation (EC) 261/2004 covers all departures from Dublin — including flights to London or Manchester, where the UK leg is protected on the outbound but governed by UK261 on the way back. Arrivals into Dublin from outside the EU are covered when flown by an EU carrier, which includes Aer Lingus and Ryanair. Compensation runs €250 for trips up to 1,500 km, €400 for most other intra-European flights and €600 for journeys over 3,500 km outside the EU, once you land three hours late or more. Irish limitation periods are unusually generous — six years for contract claims — and the national enforcement body is the Commission for Aviation Regulation.
Preclearance adds a step to the US departure process, so a late inbound flight can make you miss the slot even when the aircraft is still at the gate; note the times shown on your boarding pass and any queue announcements. Connections booked as two separate tickets — very common when a Ryanair flight feeds a long-haul departure — are treated as two journeys, and only a single reservation gives you re-routing rights. If your bag is delayed on arrival, report it at the airport and keep the reference, because baggage falls under the Montreal Convention rather than EC 261 and has its own deadlines.

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