Ryanair has initiated legal proceedings in the High Court against Google and the website eDreams over what the airline says is misleading advertising of flights.
It is the latest in a series of cases Ryanair has taken against websites known as "screenscrapers" which re-sell flights from a number of airlines, including Ryanair, on their own behalf.
The carrier says some of its customers have experienced problems after booking with such screenscrapers including checked in bags not being recorded and additional passenger names not being included in their bookings.
Ryanair takes issue with eDreams' use of what it says are "copycat websites" designed to look like Ryanair's own site and which, it claims, are used with the intention of making customers believe they are booking directly with the airline rather than through eDreams.
Ryanair won a case at a regional court in Germany during the summer to prevent eDreams using the domain ryanair.edreams.de in Germany.
The airline was also awarded compensation for trademark infringement.
eDreams' main site features the Ryanair logo but is branded as eDreams and urges users to "browse low cost flights with Ryanair using the eDreams search engine".
Ryanair is also suing Google. The airline says Google should be imposing tighter restrictions on eDreams' online advertising.
In a statement, Ryanair's chief marketing officer Kenny Jacobs said the airline expects Google "to ensure that this advertising is honest and transparent (namely that eDreams advertises as "eDreams" and not as Ryanair), which is what Google's own code of conduct requires and which will prevent more ordinary consumers being deceived".
Separately, speaking to journalists at an event in London, Ryanair chief executive Michael O'Leary said the recent terrorist attacks in Paris had not had a significant impact on its business.
There has been "some softness in pricing since the attacks, he said "but nothing material".
In response eDreams said it disagrees "strongly with Ryanair’s position".
In a statement it said: "This action is clearly just another attempt from Ryanair to stop Online Travel Agencies from offering consumers the best price and choice when it comes to booking flights."
