Air Force 611 Institute Celebrates the Trial Production of First Batch J-20 admin — December 26, 2015 add comment 611 Institute celebrates its 45th anniversary and the trial production of first batch of F -20 fighter. Flag Raising and Torch Relay Ceremony. 611所庆祝建所45周年暨首批歼-20战斗机投入试用生产。 升旗暨火炬传递仪式