http://en.people.cn/90001/90776/90786/7354617.html
The J-20 prototype made its 18-minute debut flight in Chengdu on January 11, when US Defense Secretary Robert Gates visited Beijing
1月11日,当美国国防部长罗伯特盖茨访问北京时,J-20原型机在成都进行了18分钟的首次飞行
https://www.nytimes.com/2011/01/12/world/asia/12fighter.html
https://www.flyingpenguin.com/?p=9312
首飞视屏:2011-1-11