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Marriott has arranged for some rooms to be booked directly through TripAdvisor. Credit Joe Buglewicz for The New York Times. For years, travelers have been drawn to online sites like Expedia, Travelocity, Orbitz and Priceline to find and reserve hotel rooms, flights and rental cars. Hotels welcomed the system â or at least learned to live with it â even though the business came at the cost of substantial commissions.