Three new transatlantic routes are being introduced next year by Aer Lingus from Dublin to Los Angeles, Newark and Hartford, Connecticut.
The announcement comes within weeks of the take over of the Irish carrier by British Airways owner International Airlines Group.
The year-round service to LA starts in May with five flights a week using Airbus A330 aircraft.
Daily year-round A330 flights will start in early September to Newark, followed by a daily link to Hartford operated by a Boeing 757-200.
The expansion – the largest since the Irish carrier started transatlantic flying in 1958 – will create more than 200 jobs for pilots, cabin crew and ground services staff.
Total long-haul seat capacity will grow by more than 17% in 2016, representing the fourth consecutive year of more than double-digit long-haul growth.
The new routes, in addition to nine existing transatlantic services, will also provide connections from a range of UK and European cities.
Aer Lingus will operate 28 daily services across the Atlantic next summer.
Los Angeles and Newark flights go on sale today with Hartford fares available from November 3.