A total of 168 seats for passengers will be arranged in C919 airplanes, six seats in a row and 28 rows in total. Model planes of C919 and new ARJ21 regional jet flight are exhibited at the booths of Commercial Aircraft Corporation of China Ltd (COMAC). One side of the model planes is made of transparent material and visitors can see the interior of the planes. Aviation Expo/China 2015 Aviation Expo (16th event) is held at National Convention Centre in Beijing from Sept. 16 to 19, 2015. (Photo/mil.huanqiu.com)