The flights are a newest sticking point between China and Taiwan, which Beijing considers a province to be reunited with the mainland. Taiwanese President Tsai Ing-wen, whose ruling Democratic Progressive Party supports independence, this month protested China’s “reckless” decision to approve four new flight routes over the Taiwan Strait, which it sees as part of a Chinese campaign to undermine its sovereignty.
China’s unilateral decision to put the four routes — M503, W121, W122, W123 — into operation in early January affected Taiwan’s aviation safety and national security and added to challenges between the two sides, Mainland Affairs Council Minister Chang Hsiao-yueh said Monday in Taipei.