Unister is an e-business company founded in 2002 based in Leipzig, Germany. It operates several online travel portals and has over 1670 employees with more than 450 in IT. Some of its major travel portals include Ab-in-den-urlaub.de, Travel24.com, Fluege.de, Reisen.de, and Urlaubtours.de, which allow users to book flights, hotels, vacation packages and more. However, its Fluege.de portal has been controversial due to a lack of transparency in displaying flight prices and bundling additional services into packages without clear disclosure.