The number of prominent global hotels TripAdvisor added to its Instant Booking feature appears to have jumped more than 20% during the fourth quarter of 2015 after the world’s largest travel-review site reached a distribution agreement with Priceline Group, according to a recent study by Piper Jaffray, an investment bank and asset management firm. Of a sample of 500 global hotels — defined by Piper Jaffray as the first five hotels that appear in Internet searches of the top 100 global destinations — TripAdvisor enabled 92% of them to be directly booked through Instant Booking by the end of the year, according to Piper Jaffray’s Jan. 5 note. That number was up from 76% on Sept. 15. The catalyst was Priceline Group, No. 2 on the 2015 Travel Weekly Power List, which last fall reached an agreement for inventory on its unit to be directly bookable on TripAdvisor. With’s hotel room inventory fully integrated, TripAdvisor will have more than 400,000 hotels bookable via Instant Booking, according to TripAdvisor spokesman Kevin Carter. Get the full story at Travel Weekly