 In November 2009 , KnAAPO started manufacturing the first serial aircraft ; Sukhoi estimated that 24 to 30 aircraft would be produced each year from 2010 to 2020 . On 11 October 2010 , the first production Su @-@ 35S had completed general assembly ; at this point the preliminary flight test programme had logged 350 flight hours across 270 flights using the two remaining flying prototypes . Sukhoi confirmed that the aircraft had fully met all specifications and parameters , including maximum speed , height , radar detection range and manoeuvrability . The first Su @-@ 35S took its maiden flight in May 2011 . 
