Dublin Airport in a nutshell

Dublin Airport is the base for Ryanair, Europe's largest low-cost carrier, as well as for Aer Lingus, Ireland's national airline. It is located 11 km north of the city centre.
Dublin Airport is a major hub and is the main entry point to the whole of Ireland.
Search for airline tickets at aerlingus.com
US Preclearence
Dublin is one of only two airports in Europe (along with Ireland's other airport, Shannon) to have US immigration pre-clearance in the terminal. When you arrive in the US, your flight will be checked in as domestic, saving you the often long queues that can be common at US airports.
However, before flying from Dublin to the US, ideally arrive at the airport 3 hours before your flight.
You will also go through US Preclearance immigration in Dublin when transferring from another flight to the US.
Get more tips for travelling from Dublin Airport
Whether you’re arriving to or departing from Dublin Airport, check out our handy tips and recommendations:
Any questions left?
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Be aware of the dimensions of your luggage. Employees, presumably from Ryanair, on Ryanair flights to Vienna are very aggressively and shoutingly charging for oversized luggage.
It is simply better to fly with a backpack of the allowed size... Otherwise, I doubt they were Ryanair employees. I assume they have some sort of handling agency in Dublin.
That's for sure. They checked the size of the luggage after "unzipping" so that passengers would not be able to throw anything out of the luggage or put it in a fellow passenger's luggage. I'm not sure about Ryanair, I was probably writing because Ryanair recently increased rewards to staff for being found with oversized luggage, and the behaviour of the staff at the gate was quite aggressive. It was clear he wanted the reward at any cost. So far, I have always encountered a fair attitude from employees towards passengers. But here, from the beginning, the shouting created a stressful situation.