Apple Mac users booking hotels on the Orbitz travel site could end up paying more for their holidays, reports the Wall Street Journal.

Orbitz told the paper it was showing Mac users different, and in many cases more expensive, hotels to those shown to people browsing on a Windows PC.

Orbitz said research suggested Mac users generally spent about 30% more per night on hotels than PC users.

But it never showed the two user groups the same room for different prices.