Supreme Leader Kim Jong-un was seen at the controls of one of the Korean People's Air Force Antonov An-2 aircraft while on an inspection visit to an aircraft maintenance plant last week, and analysts in South Korea say that Pyongyang has updated the colour scheme of the vintage planes, the Chosun Ilbo newspaper reports . Previously painted khaki, the aircraft now have a blue underside and green upper surfaces, meaning they would be difficult to spot on low-level missions. "Seen from above, they'll be difficult to identify, and seen from below they could be seen as part of the sky," says a South Korean officer. "It seems the North was encouraged by the relatively successful infiltration of sky-blue drones last year." Several drones, all painted pale blue, were found in South Korea in 2014, and a military enquiry concluded they came from the North.