The U.S. airline industry continues to face major financial losses after a sharp drop in air travel caused by the coronavirus crisis. The airlines are attempting to persuade Americans that it is safe to fly even as COVID-19 infections have been rising in some areas. The companies say measures such as requiring face masks and operating hospital-quality air cleaners make sitting in an airplane safer than many other indoor settings. Public opinion studies, however, have suggested that many people still do not feel good about getting on a plane. In a June study by Consumer Reports of 1,000 people, 70 percent said they believed flying was either very or somewhat unsafe. Those questioned said they thought going to a hospital emergency room or standing in line to vote was safer than getting on a plane. In another study requested by an airline trade group, the biggest concern of travelers was the possibility of sitting next to an infected person.