HONG KONG — An unmanned, oval-shaped craft from flying taxi maker EHang hovers, whirring noisily like a mini-helicopter over a riverside innovation zone on the outskirts of the southern Chinese business hub of Guangzhou, part of a trial of a mini-flying taxi that once might have been found only in sci-fi films.

In nearby Shenzhen, food-delivery drones already are part of daily life and a novelty attraction for tourists, even if such services cost more. In the waterfront park surrounded by high-rises, Polish tourist Karolina Trzcianska and her friends ordered bubble tea and lemon tea by phone, just to give it a try. Their drinks arrived via a drone buzzing through the drizzle about 30 minutes later.

“This is the first time I’m seeing something like this, so it was super fun to see the foo

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