(Photo : Photo by Christopher Furlong/Getty Images) A pair of F35-B Lightning stealth jets, which will take over capabilities from Tornado force, fly off the wing of an RAF Voyager during air to air refueling, as Tornado GR4's take part in farewell fly-past over Britain on February 19, 2019 in Oxford, England. Nicknamed the "Tonka" by aviation enthusiasts, the Tornado GR4 will took part in a series of flypasts to commemorate the aircraft's contribution to defending the UK as it is retired from service. According to Global Times' latest report, the advanced combat airplane has entered the next level of combat readiness. However, China hasn't confirmed yet if its J-20 will soon be used in possible real air combat.