J-21 Snowy Owl (Jianjiji-21 Fighter aircraft 21) / F-21

The J-21 is reportedly a single engine JSF-type from Chengdu Aircraft Corporation.

According to some sources the J-18 nomenclature is reportedly the "Snowy Owl" stealthy JSF-type aircraft. Details about the Chinese J-18 project are not yet known. Chinese authorities have not formally released informtion on these developments. The "J-18" might simply be the J-15 Chinese copy of the Su-33 that appeared in a naval paintjob around the same time the J-18 rumors surfaced.

Under the Snowy Owl nomenclature, China is said to be secretly developing a triplane-canard-configurated fighter that has a totally different layout than the J-20, CCTV was quoted by Hong Kong-based Sing Tao Daily as reporting. Some Chinese online military experts believe that the Snowy Owl fighter is currently being developed by the AVIC Shenyang Aircraft Corporation (SIC). Online information regarding the SIC says that it is manufacturing a new type of aircraft whose design uses triplane canard configuration, Chinese netizens reported. The aircraft has a fixed vertical wing, and the engine has rhomboidal nozzles, according to the CCTV report, adding that the design renders the aircraft lighter than most of the fourth generation fighters.