North Korea: Recap of its Satellite Development and Airspace Usage · Global Voices
Lee Yoo Eun

North Korea Tech blog wrote a post on North Korea's space development and use of its airspace with data from he pulled from an old email archive, providing a bit of history.
Attempts to open up North Korea’s airspace began gathering pace in the mid nineties. Flying over the country rather than around it would allow airlines to cut costs and shorten travel times on some Asian flights. It also stood to make money for North Korea in overfly charges[…]