A visitor look at a Rain Radar Simulation System at the 2013 international air traffic control exhibition on March 12, 2013. The three-day event with exhibitors from 116 countries and regions demonstrates all kinds of the latest air traffic technic and equipments.(Xinhua/Sylvia Lederer) 

People visit the 2013 international air traffic control exhibition on March 12, 2013. The three-day event with exhibitors from 116 countries and regions demonstrates all kinds of the latest air traffic technic and equipments.(Xinhua/Sylvia Lederer)