The Main Transatlantic airports are Dublin and Shannon. There are also Airports in Belfast, Cork, Kerry and Knock (Ireland West Airport). The Irish National Carrier is Aer Lingus, though many international airlines do transatlantic flights into Ireland. For European flights then Ryanair and Aer Lingus are the main two, though again there are countless other airlines doing flights from Ireland to the rest of Europe.
TUI Airways operate out of four airports in Ireland - Dublin, Cork, Ireland West Knock and Shannon.
Irish Ferry Ports:
Where you can sail to:
Roscoff, France (seasonal) - Brittany Ferries