By Gerry Doyle SINGAPORE (Reuters) – China’s much-anticipated J-35A stealth aircraft, centrepiece of this week’s Zhuhai air show, has been more than a decade in the making, but experts say little is known about its capabilities. The first public appearance of the land-based J-35A will take place on Tuesday, a day after the 75th anniversary of the founding of the People’s Liberation Army Air Force (PLAAF), and will include a