According to Wikipedia: "The Shenyang J-31, (or "FC-31 4th Generation Multi-Purpose Medium Fighter") also known as "Gyrfalcon" or "Falcon Hawk" by some military enthusiasts, is a twin-engine, mid-size jet fighter currently under development by Shenyang Aircraft Corporation. The fighter has also been referred to as F-60 or J-21 Snowy Owl in some media reports."