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Currently, the United States has around 20,000 general aviation airports, and more than 70 percent of general aviation aircraft globally are delivered to the US, according to data from Qianzhan Institute for Industrial Research.

Customers shop at one of Buy42's six brick-and-mortar charity stores in Shanghai. Photo By He Qi / China Daily

Customers wanting to use unmanned stores have to register their mobile phones and payment accounts, and that means every transaction can be recorded and the data can be used for marketing and advertising purposes, said Matthew Crabbe, Asia-Pacific research director of consultancy Mintel.

Customers try the Google Daydream VR at a Google pop-up shop in the SoHo neighborhood in New York City. The shop lets people try out new Google products such as the Pixel phone, Google Home, and Daydream VR. [Photo provided to China Daily]

Cuba currently has 350 positive cases and nine deaths, according to data from Johns Hopkins University.