Smartwings, a.s. (formerly Travel Service, a.s.)[2] is a Czech airline with its head office on the property of Václav Havel Airport Prague in Ruzyně, 6th district, Prague.[5] It is the biggest airline in the Czech Republic, and it operates scheduled and chartered flights, mainly to leisure destinations. The airline also wet and dry leases its aircraft to other airlines. It is a wholly owned subsidiary of Czech Airlines[4] and has subsidiaries in Poland, Hungary and Slovakia.