According to the State Department, the United States expects our airline carriers will comply with the ADIZ rules laid out by China in the Notice to Airmen announcing enforcement of the ADIZ.
As with the distinction we are observing with respect to Iran’s right to enrich uranium, our acceptance of the ADIZ rules does not mean we agree with them, according to the State Department formulation. It just means our civilian airliners are complying with them.
Japan and South Korea are taking a different tack. Japan continues to urge her national airlines to defy the ADIZ requirements announced by China.
South Korea is planning to announce an extension of her ADIZ. It will have a bigger overlap with China’s after the extension. Seoul is also urging the national airlines to defy the Chinese ADIZ:
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The Seoul government has also told its national airlines not to identify their planes to China as Beijing demanded all airplanes do when flying in the ADIZ.
According to Japan’s defense minister, Itsunori Onodera, on Saturday, China did not scramble jets in response to a Japanese flight through the ADIZ, as announced by the Chinese.