Norwegian Air Shuttle ASA is holding discussions with Boeing Co. following a series of delays during the holidays caused by technical problems with its Dreamliner jetliners, further denting the airline's reputation as a newcomer to the long-haul market.

"Both we and Boeing agree that there has been too many problems," Norwegian spokeswoman Charlotte Holmbergh Jacobsson said Tuesday. Norwegian's third-quarter earnings were damaged by Dreamliner-related delays and the airline has in the past taken two of the jetliners out of service for fixes.

"This is naturally unacceptable," said Ms. Holmbergh Jacobsson, adding that the company has yet to tally the total costs generated by the delays. Norwegian's CEO, Bjorn Kjos, and other company executives are in the U.S. to meet with Boeing representatives. Mr. Kjos has been a strong supporter of the Dreamliner program, but the early problems with the aircraft have been a recurring headache.

"We share in Norwegian's disappointment in the airplane's recent performance and we are addressing that as expeditiously as possible," a Boeing spokeswoman said, adding that while the airline has had recent disruptions, the 787's performance is "in line with most other new operators." The spokeswoman declined to comment on any possible compensation talks with the airline.

The most recent troubles left hundreds of Norwegian's passengers stuck for up to two days at airports in New York and Bangkok as one of its Dreamliners experienced technical problems. The delays have been the subject of heavy media attention in Norway, its most important market.

Norwegian, Europe's largest discount airline by passengers after Ryanair Holdings PLC and EasyJet PLC, is making a push into the long-haul segment via new routes to the U.S. and Asia. The company's ambitious long-haul operations are currently served by only three Dreamliner aircraft, which makes flights vulnerable to delays should an aircraft be unavailable.

Repeated technical problems with the Dreamliner aircraft resulted in a sharp fall in Norwegian's third-quarter net profit, as the cost of temporarily replacing the aircraft offset higher revenue. The airline booked third-quarter costs of 101 million Norwegian kroner ($16.4 million) for leases of replacement aircraft, extra fuel, and providing accommodation, food and drink for delayed passengers.

According to Norwegian, these latest Christmas holiday delays added even further costs to the list, including hotel nights for passengers and, eventually, the charter of another airline to bring passengers to their destination.

Norwegian is expecting another three Dreamliner jets to be delivered from Boeing this year. Additional Dreamliners are set for delivery in 2015 and 2016, and negotiations are continuing for more beyond that.

Jon Ostrower in Chicago contributed to this article.

Write to Christina Zander at christina.zander@wsj.com

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