As the coronavirus pandemic rocks the aviation industry, two industry giants are fighting to protect their legacies. WSJ’s Jaden Urbi explains what Boeing and Airbus are doing to survive this unprecedented crisis—and how it could reshape the future of aviation. Photo composite: George Downs Boeing Co. and Airbus SE are researching the new coronavirus’s behavior inside jetliners, part of an industry push to curb risks that have brought air traffic to a near standstill. Their work will involve academics, engineers and medical experts who will examine new measures to prevent disease transmission on airplanes, according to the companies and people involved in their discussions. The…