The Indian Air Force has boasted its Su-30 Flankers have tracked J-20s on radar, but as stealth fighters often employ emitters called “Luneburg Lens” to enlarge their RCS on routine flights, and thus conceal their true capabilities, it’s difficult to infer much from this either.In January 2011, the maiden flight of a large, dagger-like grey jet announced that China had developed its first stealth aircraft—the Chengdu J-20 “Mighty Dragon.” Six years later, after several substantial revisions, J-20s entered operational service with the People’s Liberation Army (PLA) Air Force.(This first appeared several months ago.)As radar-guided missiles from fighters and ground-based launchers threaten aircraft from dozens, or even hundreds of miles away, stealth capabilities are increasingly perceived as necessary for keeping fighter pilots alive on the modern battlefield.But just how good is the J-20? And what is its intended role? After all, America’s first stealth fighter, the F-117 Nighthawk, was not even really a fighter and lacked any air-to-air capability whatsoever.