Korean Air Completes Extensive Refurbishment CheapOair Staff April 24, 2011 general Korean Air announced this week it successfully completed its six-year, extensive refurbishment plan that saw the company install newly styled premium seats and state of the art audio and video on demand systems on each aircraft. For six years, from 2005 to 2011, Korean Air refurbished 49 passenger planes made up of Boeing 777s, B747s and A330s. In addition to next generation seats and AVOD systems, Korean Air upgraded their gallery facilities.