The Chinese J-20 stealth fighter has reportedly returned to flight testing, completing a publicly witnessed flight in recent days that was much longer than its first reported flight back in January. Britain’s Daily Mail reported Tuesday that a J-20 aircraft took to the skies this past weekend from an airfield in Chengdu in southcentral China in a flight meant to coincide with the 60th anniversary of China’s aviation industry. It cited a report in a Chinese Communist Party-owned tabloid that included alleged new J-20 photos. US officials have said they were not surprised when China unveiled the J-20 late last year. However, they have acknowledged that the J-20’s emergence has shown that China may be making progress in the design of advanced combat aircraft more quickly than the United States had anticipated.