STA Travel is a collection owned by the Swiss Diethelm Keller Group, with headquarters in Zurich and London. It claims to be the world's largest travel company for students and young people. The STA group employs nearly 2,000 people in over 200 branches in 12 different countries, with franchises and business partners in another 48 countries. In 2011, its gross turnover was CHF 997 million (US$1,126 million), with net sales – mostly commission on ticket sales – of CHF 141 million.