The Danish company said the online travel giants were in breach of competition rules by trying to maintain “artificially high price levels” for hotel rooms - thereby potentially trying to keep their commissions high - by preventing Nustay from offering lower prices.

Nustay said Expedia and Booking.com downgraded hotels in their search rankings if a hotel’s prices were lower on a competing website, harming the hotels’ ability to land bookings. Hotels, in turn, are pressuring Nustay to raise prices so they wouldn’t lose more business on Booking and Expedia, it added.