Ryanair has rejected EU concerns about its much-publicised decision to cancel bookings made through third-party websites.
The European Commission had sought clarification from the Irish airline about its threat to cancel thousands of reservations made through so-called "screen-scraper" sites.
Ryanair says it has now given the commission detailed evidence supporting its decision.
It claims "screen-scraper" sites are breaching its rights and engaging in anti-consumer practices.