To some observers, the changes in the third flight test aircraft from the first two machines indicate aircraft 2011 is a 'true' J-20 prototype, while aircraft 2001 and 2004 are technology demonstrators. This, though, is a moot point. While well-informed reports say changes for pre-production J-20s should be minimal, aircraft 2011 could well be another technology demonstrator. On the other hand, others say the PLAAF plans to introduce the first low-rate initial production J-20A as early as possible, and that it will be of a similar specification to aircraft 2011.
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