New images circulating online appear to show what defense analysts believe is the fifth prototype of China’s sixth-generation J-36 fighter jet, according to a report. Prototype indicates China may be accelerating its flight-testing programme The emergence of another apparent prototype indicates that China may be accelerating its flight-testing programme. The reported progress comes amid increasing competition between China and the United States to develop sixth-generation fighter aircraft. Since military prototypes often undergo multiple design revisions, such modifications are considered a normal part of the aircraft development process. The progress of the J-36 is being closely monitored around the world, particularly as the United States continues developing its own next-generation fighter programmes.