Taiwan warns against travel to China after execution threat https://www.nbcnews.com/news/world/taiwan-warns-travel-china-execution-threat-rcna159203

TAIPEI, Taiwan — Taiwan’s government raised its travel warning for China on Thursday, telling its citizens not to go unless absolutely necessary, following a threat from Beijing last week to execute those deemed “diehard” #Taiwan independence supporters.

Liang Wen-chieh, spokesperson for Taiwan’s Mainland Affairs Council, told reporters the raised travel warning also applied to the Chinese-run cities of Hong Kong and Macau.

... and there are more reasons not to switch planes in Hong Kong or Shanghai...