The US Transportation Department says it will limit some Chinese air carrier flights in retaliation to similar limits imposed by China on four United Airlines flights. The order said the department will limit over a four-week period each of four Chinese carrier flights to 40 percent passenger capacity. Beijing said on August 6th that it was imposing sanctions after it alleged five passengers who traveled from San Francisco to Shanghai tested positive for COVID-19 on July 21st. Washington is at loggerheads with Beijing over several issues including trade, technology, and regional security.