United Airlines announced that it will now maximize air flow volume for all mainline aircraft high-efficiency particulate air (HEPA) filtration systems during the entire boarding and deplaning process, with the goal of reducing the spread of COVID-19. Scott Kirby, CEO, said the environment on an aircraft is safe, but the earlier that air flow over HEPA filtration is maximized, the better for crew and customers. He said that air travel is not likely to get back to normal until a widely administered vaccine is available – “so we’re in this for the long haul.” The onboard system, according to United, replaces the entire volume of cabin air every two to three minutes by providing 50% HEPA-filtered, recirculated air mixed with 50% outside air, which allows a constant flow of either fresh or HEPA-filtered air throughout the cabin.