Where was The Killer (1989) filmed?
1989 film directed by John Woo
The Killer (1989) was filmed in Kai Tak Airport, Causeway Bay and Stanley, 3 places named in its Wikipedia article's Filming section, in China. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.
Places per Wikipedia's Filming section
Wikipedia’s Filming section names 3 places. Each links to the sentence that says so.

