Five million people had left Wuhan before Chinese authorities locked the city down. From December to March, there were 3,200 direct flights from China to the U.S., arriving mainly in Los Angeles, San Francisco, and New York. Sixty percent of flights from Italy to the U.S. landed in New York. They brought a new mutation of SARS-CoV-2 that would prove to be even more contagious than the Chinese original.
