As a Booking.com Affiliate Partner, you cannot own, use, or in any other way be associated with any domain name(s) that re-direct to any website(s) containing the word ‘Booking’ in the URL address.
This restriction also applies to any misspellings, typos or variations of the word ‘Booking’, such as ‘Bookingz’, ‘Bookking’, ‘Boking’, or any other comparable domain names that are substantially similar to the word ‘Booking’. Such similarities are determined at the sole discretion of Booking.com.
Clause 4.3.3 from Booking.com Affiliate Agreement:
The Affiliate shall (and shall procure that the companies within the Affiliate Group shall) not (directly or indirectly) register, acquire, use, purchase or obtain Internet domain name which incorporates any word or words which are identical, or confusingly or substantially similar to “Booking”, “Bookings” or any variations, translations or misspellings thereof, included as part of the address.