Duty-free is off-duty and will remain so for years, say industry experts. Through nine months, most players in the duty-free fragrance and cosmetics business say sales plunged up to 95% as business and leisure travel disappeared due to COVID-19. As a result, most experts say it will be 2023 before travel-retail sales return to 2019 levels. Still, there have been signs of a return to travel—especially in Asia and, in particular, China. For example, in August, duty-free spending on Hainan Islan...