United Airlines workers load cargo onto a plane at San Francisco International Airport on July 08, 2020 in San Francisco, California. (Photo by Justin Sullivan/Getty Images) United Airlines is adding new and returning routes in October, allowing the airline to fly 40% of its full flight schedule compared to the previous year, a 6% increase compared to what it plans to fly in September.United said it plans to resume domestic flights for eight routes to Hawaii, pending approval of the state's pre-arrival COVID testing program, which will allow the airline to fly at 46% of its full domestic flight schedule in October compared to the previous year, an 8% increase compared with September.The company will resume or start new service on nearly 50.