Today is the sixth anniversary of the first flight of the 20. Six years ago, the world was shocked by the first five generations of Chinese aircraft, the US Defense Secretary Gates, who is visiting China, is even more embarrassed to say that China is unable to develop five generations of machines. Six years have passed, and recently, the 20 with the official service number has been exposed. Although there is no official news, the 20 service may be an open secret. The picture of the 20 fighter taken by the latest netizen shows that its number is 78274, indicating that at least 4 20 official versions have been numbered. According to the current exposure, the number of the first batch of 20 will not be too small. The J-20 fighter is a Chinese stealth fighter developed by Chengdu Aircraft manufacturer. At hours on January 11, 2011, the J-20 fighter made its first flight in Chengdu, lasting 18 minutes, this marks a new page in the development of China's stealth fighters. The success of the first flight of the 20 fighter is also a microcosm of China's high-tech rapid progress. In the future, the aircraft will be responsible for the Chinese Air Force's sovereignty over the air and the sea. When the 20 fighter is in service has always been a topic of concern. However, just recently, the pictures uploaded by netizens showed the 'Shengjing' of the three 20 fighters in the same frame, showing that China has already maintained a certain number of 20 fighters. The stealth machine has always been the foundation of the US Air Force's air superiority. The service of the Chinese J-20 fighter indicates that the long-standing overwhelming stealth advantage of the United States has begun to end. In the eyes of many senior US Air Force officials, this situation of decades of advantage will not happen again. Related links: inflatable battery car cover children's inflatable battery car robot pedal inflatable trampoline slide