Sensitive F-35 fighter jet technology was unexpectedly diverted to Hong Kong this summer, sparking an inquiry on Capitol Hill and raising the possibility that China could have access to key components of the highly classified weapon system. A shipment of F-35 parts bound for the United States for repairs was rerouted as it transited the Pacific Ocean from Australia, according to three people familiar with the matter who were granted anonymity to discuss private conversations. The Pentagon confirmed the disappearance of some components. The parts, which an intermediary was transporting on behalf of F-35 manufacturer Lockheed Martin, instead wound up...