There are over 1 billion bicycles in use worldwide.[23] In 2002 there were an estimated 590 million cars and 205 million motorcycles in service in the world.[24][25] At least 500 million Chinese Flying Pigeon bicycles have been made, more than any other single model of vehicle.[26][27] The most-produced model of motor vehicle is the Honda Super Cub motorcycle, having passed 60 million units in 2008.[28][29] The most-produced car model is the Toyota Corolla, with at least 35 million made by 2010.[30][31] The most common fixed-wing airplane is the Cessna 172, with about 44,000 having been made as of 2017.[32][33] The Soviet Mil Mi-8, at 17,000, is the most-produced helicopter.[34] The top commercial jet airliner is the Boeing 737, at about 10,000 in 2018.[35][36][37] At around 14,000 for both, the most produced trams are the KTM-5 and Tatra T3.[38] The most common trolleybus is ZiU-9.