Lockheed Martin said today it is lowering its sales guidance for the year, primarily because of expected challenges to F-35 production related to the coronavirus crisis. In a call with analysts today, Ken Possenriede, Lockheed's chief financial officer, said the aeronautics business is seeing a number of obstacles, from supply chain disruption to strict distancing requirements to shipping constraints. The company's analysis "has given us concern so we reduced our guidance at aeronautics and specifically it's F-35 production," he said,...