Currently, fighter aircraft from the Chengdu Aircraft Industry Group and Shenyang Aircraft Corporation are in the same branch.
If we add the Chengdu J-10 in the future,  this may make the J-11 line unnessacarily long, so i suggest that if we do add the J-10 in the future, we should add a new branch with the J-7II, J-7C, and in the future the J-10, J-10B,  J-10C, JF-17, J-20 and possibly even the J-9(though this is more likely to be a premium)
              
              
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            tech trees are built by type of vehicles, not by production companies.
              
              
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            Usualy, but if you have 2-3 lines of fighters they are sorted by company or at least design philosophy (agile dogfighters, heavier fighter-bombers, stronger energy fighters), only TTs with too small numer of airframes lack this.
              
              
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            It is the case for mig and sukhoi
              
              
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            exactly my reason. both shenyang and chengdu make fighter jets, therefore they should be seperated like mikoyan and sukhoi.
              
              
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