Voyages to France this summer have been cancelled on one particular boat.
The building of ship W.B. Yeats has been delayed by German shipbuilder, Flensburger Schiffbau-Gesellschaft & Co.KG (FSG).
The new ship was due to commence sailings between Ireland and France from the 30thJuly 2018 but journeys this summer have been cancelled due to the delay.
Irish Ferries said the ship would commence sailing on Dublin / Holyhead as scheduled in September.
6,000 bookings have been impacted by this issue.
Customers have been offered a number of different travel options including sailings on the Oscar Wilde ferry or by sailing to the UK and then travelling to France.
The transport company said in a statement: "Irish Ferries very much regrets the inconvenience these cancellations cause our customers and hopes that as many as possible will choose to be accommodated via the company’s alternative arrangements and continue with their holiday plans.
"As valued customers of Irish Ferries, we are offering each affected customer a €150 voucher which can be used on any of our Ireland-France routes next year," they added.
W.B. Yeats - Important Customer Update
— Irish Ferries (@Irish_Ferries) June 12, 2018