Booking Holdings, (formerly known as The Priceline Group), is an American company that owns and operates several travel fare aggregators and travel fare metasearch engines including namesake and flagship Booking.com, Priceline.com, Agoda.com, Kayak.com, Cheapflights, Rentalcars.com, Momondo, and OpenTable. It operates websites in about 40 languages and 200 countries. In 2016, 88% of its bookings were made outside the United States – most of which used Booking.com. In 2016, consumers booked 556.6 million room nights of accommodation, 66.6 million rental car days, and 7.3 million airplane tickets using websites owned by Booking Holdings. In 2016, 93.4% of revenues were derived from commissions and 6.6% of revenues were derived from advertising.