In the past, there were only two kinds of fighter penetration, one was high-altitude and high-speed penetration, such as Russian MIG 3 1. This kind of penetration usually flies at the speed of sound for about three times at an altitude of more than five meters or even 30 thousand meters, lasting for two nights, commonly known as double triple flight. This penetration method is suitable for some high-altitude reconnaissance planes and bombers, and the unique interceptor designed by the former Soviet Union was developed for the reconnaissance planes and bombers mentioned above, so it also has the ability of double three.

This method was a cutting-edge technology in the 1970s and 1980s, because when an airplane flies at high altitude and high speed, the fuselage temperature is very high, and ordinary airplanes will directly disintegrate. This flight mode not only has strict requirements for the aircraft mechanism, but also challenges the pilot's physiological conditions, so there is no difference between the pilot's flight suit and the spacesuit. The premise of this penetration method is that the air defense force was weak at that time, and it was impossible to quickly capture the high-speed moving target, let alone lock the high-altitude high-speed target and launch an attack in time. But today's air defense weapons, especially Russian S300 and S400 special weapons, all do this.

Another penetration method is ultra-low altitude penetration, and the ultra-low altitude standard is below 500 meters. Because the earth is a sphere, there is a blind spot in the ground air defense radar within a certain radius in the ultra-low altitude range. Moreover, there are many ground obstacles as barriers in the ultra-low altitude range, so ultra-low altitude penetration has irreplaceable advantages. However, the ultra-low altitude penetration requires high performance of the aircraft, especially the maneuverability. The MIG3 1 mentioned above can't fly at this height at all. There is this link in the game of eagle hitting the sky. The European fighter typhoon broke into Sam's air defense missile position at an altitude of 300 meters or even 100 meters. It can be seen that the low-altitude penetration of high-mobility fighters can completely treat each other's low-performance air defense missiles as scrap iron.

Stealth fighters appeared at the end of the 20th century. As the first generation stealth fighter-bomber, F 1 17 led the third penetration mode, namely stealth penetration. Stealth penetration means stealth of air defense radar within a certain radius. Now the radar stealth effect of F22 and F35 can reach the level of eagle, which means that the radiation signal on radar is as big as eagle. The advantage of stealth penetration is that it does not require high flying skills for pilots. The low-altitude penetration mentioned above requires high flying skills for pilots. However, the disadvantages of this method are complicated process and troublesome maintenance. B2 stealth bomber spends $500,000 to maintain the stealth coating on the fuselage after each mission. This maintenance fee can only be paid by the United States.