AER Lingus is to expand its transatlantic operations with new year round services to San Francisco and Toronto.
Airline chiefs and Government claimed the investment in the North American market would boost links with Silicon Valley and also bring tourists into Ireland.
Aer Lingus said the expansion would create 200 jobs.
Christoph Mueller, the airline's chief executive, said the carrier's transatlantic business is going from strength to strength.
"Our transatlantic capacity will increase by 24% in 2014, following on from the 13% additional capacity in our 2013 transatlantic schedule," he said.
"Our operation of the San Francisco route will strengthen Ireland's ties with Silicon Valley and encourage Ireland's development as a technology hub for Europe."
"The return of the direct air service to the US west coast is particularly important and I'm very happy to see the route being filled by an Irish airline."
Aer Lingus will run five services a week from Dublin to San Francisco from April next year. A daily direct service to Toronto will kick in at the same time for the summer season with up to four services a week in the winter.
Aer Lingus said the investment will support jobs in the airline and aircraft leasing company the ASL Aviation Group.
As part of the wider transatlantic operations, new aircraft will be based in Shannon offering increased frequency in and out of New York and Boston.