Expedia

Expedia is a travel booking platform based in the United States, used to search and book flights, hotels, car rentals, cruises and package trips. Visitors compare prices across travel providers, read reviews of hotels and destinations, and manage bookings through an account on the site or its app. The platform covers both leisure and some business travel planning in one place.

Its ads.txt file lists 9 ad systems, all declared as direct sellers with no resellers. Advertising on the site includes display advertising, sponsored listings sold as TravelAds, programmatic buying aimed at verified travel audiences, an E Studio for creative production, and offsite advertising that extends campaigns beyond the site itself.