Supersonic cruise refers to the ability of an aircraft to sustain supersonic flight above Mach 1.5 for more than 30 minutes without opening the afterburner. Although supersonic cruise is not very effective in close combat of fighter jets, it plays a crucial role in rapid breakthrough. Once a fighter jet is able to cruise at supersonic speeds, even if detected by early warning radar, it can more easily reach the mission area and complete related tasks before the defense system responds or intercepts the fighter jet before it takes off. At the same time, many infrared detection systems increase their detectable range due to the use of afterburners in fighter jets. Fighter jets with supersonic cruise capability can reduce the possibility of being detected by infrared detection systems. Supersonic cruise can effectively reduce the dangerous time spent in enemy airspace. Secondly, fighter jets sometimes need to be transferred to different war zones to carry out missions, and supersonic cruising can reduce the transfer time. Finally, opening the afterburner of the fighter jet will cause a large amount of thermal radiation, which in turn generates a large number of infrared features. Don't forget that the United States has the F22, which has not been sold to any country