Aer Lingus has announced a number of changes to its winter schedule, which include the scrapping of some transatlantic services.
The airline is suspending Shannon flights to Chicago from 1 September, while services from Dublin to Washington and San Francisco are being suspended from 25 October.
It says the restart of these services in summer next year will be 'subject to review'.
Aer Lingus is maintaining its winter schedule from Dublin to New York, Chicago and Boston, and from Shannon to Boston.
However, it says the Shannon to New York direct service remains 'under close review'.
The airline says the moves are being made to address significant losses generated over the winter period on US routes, which it says are now exacerbated by extremely weak demand and lower fares.
Speaking on RTÉ's News at One, Aer Lingus Chairman Colm Barrington said there was no guarantee that all three services would be resumed next summer.
He also said the airline was working with staff on a winter leave programme for flight and cabin crew.
On shorter routes, Aer Lingus is to reduce capacity at Dublin Airport from 24 planes to 22 for the winter.
However, there will be two new routes to Fuerteventura in the Canary Islands and Monastir in Tunisia.
It is planning to increase frequency on the Shannon-Heathrow service to three flights a day.