Civil Aviation Administration Of China

The system is not perfect, but it is transparent by design.

When China's Civil Aviation Administration, the CAAC, moves to implement airspace restrictions of this magnitude, the regulatory language tends to be broader.

The stated justification covers public safety and national security in ways that give Chinese authorities wide latitude to define and enforce the boundaries as they see fit.

That is not a political observation.

Sam Chui noted in 2016 that there were only two airlines flying to North Korea at the moment, Air China and Air Korea.

Historically, Aeroflot and CAAC transited through Pyongyang during the Sino-Soviet split.

Air Korea also ran inter-Korean charters to Seoul, Yangyang, and Busan at various points.

So the answer to Daniel's question