Booking.com; Expedia Inc.; Ctrip; Triadvisor; Trivago; eDreams Odigeo; Despegar; MakeMyTrip; Lastminute; On the Beach; Alibaba Group Holding Limited; Hostelworld Group; Hotel Urbano Travel and Tourism SA; Fareportal Inc.; Trivago GmbH; ThomasCook Group; Priceline Group Inc.; HRS; Agoda; Airbnb Inc.; Hotel.de