In reaction to the COVID-19 pandemic, passenger numbers on U.S. airlines so far this year are down by 95% over last year. Few, if any,  industry observers say they’re certain what this means in the long term for commercial passenger aviation. But many agree things won’t revert to the way they before COVID-19. Tim Takahashi, a Fulton Schools professor of practice in aerospace engineering, expects airlines to take steps to provide space between passengers, plus take other measures to protect air travelers’ health. The best solution will come only when a COVID-19 vaccine is developed, says Marc O’Brien, chair of the Fulton Schools aviation program.