Photo taken on Aug. 28, 2016 shows the home-made airplane of David Hu making a test flight in Naperville, west suburb of Chicago, the United States, on Aug. 28, 2016. In a community in the western suburbs of Chicago live a group of aviation enthusiasts who turn the backyards opening into a mini airport and park small airplanes in garages. Among those planes, one was built by a Chinese-American engineer. Being an engineer of Nokia, David Hu started to make an airplane in 2006. (Xinhua/Wang Ping)