S. Korea Flights Being Jammed in Possible Attack From North - Bloomberg (http://www.bloomberg.com/news/2012-05-02/south-korea-flights-being-jammed-in-possible-attack-from-north.html)

Affected airlines include Korean Air Lines Co. and Cathay Pacific Airways Ltd., ministry official Yang Chang Saeng said by phone

I wondered about the likely Korean GPS jamming scenario, when on the circling thread, some of the argument was about the redundancy of conventional NPA's.

There is a Chinese air base between HGH & NKG, where a few years ago, you would often lose your GPS when flying nearby. It's this one-

http://i236.photobucket.com/albums/ff187/coronatower/Feidong-AB-PLA-AF-1S.jpg