2000: Vacation.com, the largest US marketing network for leisure travel[14][15] 2001: E-Travel, Inc., a supplier of hosted technology products for corporate travel[16] 2002: SMART AB, a travel distribution company in Northern Europe[17] 2003: Airline Automation (AAI), a robotic PNR processing company[18] In 2006, its name was changed to Amadeus Revenue Integrity.[19] 2004-2008: Opodo, a European travel website, which it sold in February 2011 for €450 million[20][21] 2005: Optims, a European hotel software company[22] 2006: TravelTainment, a leisure content provider[23] 2008: Onerail, a rail IT software supplier[22] 2013: Travel Audience GmbH, an online advertising firm[24] 2014: Newmarket International, an IT provider for hotels[25] 2014: UFIS, an airport IT provider[26] 2014: i:FAO, a corporate travel buying software system[27] 2015: iTesso, a Property Management System provider for hotels[28] 2015: AirIT, property and revenue management software for airports[29] 2017: Navitaire, a provider for rail and Low Cost Airlines[30] 2017: Pyton, an online booking engine supplier[31] 2018: TravelClick, a provider of cloud-based services for the hotel industry, for $1.52 billion[32] 2022: Kambr, an airline revenue management solutions provider[33]