Tingshu Wang/Reuters

ROME—For the first time in nearly three years, flights from mainland China are back in the air. But governments in a number of destination countries haven’t exactly rolled out the red carpet.

In Italy, the first country in the EU to impose new restrictions on travel from China since early 2020, every passenger on all flights coming from China—both Chinese nationals and other foreign nations—must undergo an antigen test before they leave the airport.

More than half...

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