It may be necessary to select a few typical companies and cases from the U.S. aviation industry and make a summary analysis and prediction based on the background of the COVID-19 epidemic. The overall requirement of the paper is relatively free.
It may be necessary to select a few typical companies and cases from the U.S. aviation industry and make a summary analysis and prediction based on the background of the COVID-19 epidemic. The overall requirement of the paper is relatively free.