Airbnb has bought HotelTonight, an app for finding hotel rooms at a discount, as it wades deeper into the hotel-booking business to attract a wider variety of travelers. Financial terms were not disclosed. The acquisition of HotelTonight accelerates Airbnb work to build an end-to-end travel platform that serves everyone, meeting enormous demand from—and for—boutique hotels. "Working with the incredible team at HotelTonight, we will offer guests an unparalleled last-minute travel experience that provides unique, memorable hospitality on every trip, on any schedule, at any time." Brian Chesky, Airbnb Co-Founder, CEO and Head of Community.