The Air Force is asking for proofs of concept from industry in response to its plan to lease advanced training aircraft to support a proposed new fighter pilot training program. The yearlong initial tactical training program would give young pilots more experience flying advanced jets before transitioning to fourth- or fifth-generation aircraft. The service contracted with Boeing in 2018 to build a clean-sheet trainer, the T-7A, to replace the existing T-38, but the jet is not expected to achieve initial...