F22 Raptor almost canceled: Despite its impressive capabilities, the F22 Raptor was almost canceled in 2009 due to concerns about its cost and usefulness in modern warfare. The decision was ultimately reversed and the F22 Raptor remains in service with the United States Air Force. The F22 Raptor has a unique oxygen system: The F22 Raptor's oxygen system has been the subject of controversy in the past, as some pilots have reported experiencing hypoxia-like symptoms during flight. The cause of these symptoms is still unclear, but the Air Force has taken several safety measures to address the problem. The F22 Raptor's stealth technology isn't perfect: While the F22 Raptor's advanced stealth technology makes it hard to detect by radar, it's not completely invisible. In fact, a Chinese J-20 fighter jet may have spotted an F22 Raptor during an exercise in 2018. The F22 Raptor is not invincible: Although the F22 Raptor is an amazingly capable fighter, it is not invincible. In 2018, an Israeli F16 fighter jet was shot down by a Syrian anti-aircraft missile, despite the presence of F22 Raptors in the area. The future of the F22 Raptor is uncertain: despite its impressive capabilities, the F22 Raptor is not expected to remain in service indefinitely. The US Air Force is currently exploring options for the next-generation fighter, and it remains to be seen what role the F22 Raptor will play in the future of air combat. Overall, the F22 Raptor is a remarkable aircraft that has proven itself in a variety of missions. However, it is important to remember that no aircraft is perfect and the F22 Raptor is no exception. While its advanced capabilities make it one of the most formidable fighters in the world, it is important to approach it with a realistic understanding of its strengths and limitations. It is important to note that Russia does not use the F22 Raptor, as the F22 is a fighter aircraft operated exclusively by the US Air Force. However, Russia has its own advanced fighters, including the Sukhoi Su-57. The Su-57 is a fifth generation fighter designed to compete with the F22 Raptor and other advanced fighters. Like the F22, the Su-57 is equipped with advanced avionics, stealth technology and advanced weapons. It has supercruise capabilities, which means it can fly at supersonic speeds without the use of afterburners, and it has a range of more than 2,000 miles. The Su-57 is also equipped with an advanced sensor system, including Active Electronically Scanned Radar (AESA), which can detect and track targets at long ranges. It is also equipped with a passive sensor, allowing it to detect and track enemy aircraft without emitting a detectable signal.