They fly at an average speed of about 110 km per hour ( 68 mph ) at an altitude of 1.3 km ( .8 miles ) . Three diminutive single - engine unmanned light planes were found in March and April . They look like hobby ##ist model airplanes with consumer cameras shoved into them . They do n't have strong reconnaissance or spy capabilities , but they made it through air defenses . Spring is typically a time of high provocations between North and South Korea .
Three diminutive single - engine unmanned light planes were found in March and April . They look like hobby ##ist model airplanes with consumer cameras shoved into them . They do n't have strong reconnaissance or spy capabilities , but they made it through air defenses . Spring is typically a time of high provocations between North and South Korea .