Readers write about the Electra.aero Goldfinch, F-35 engine upgrade, Material Review Board related to the Boeing 787 program and new-start U.S. airlines.
A new U.S. effort to prove technology for reusable hypersonic flight is inching forward as government scientists seek information on industry-funded projects.
Rather than proceeding with a new F-35 engine, the service is using remaining Adaptive Engine Transition Program funds for sixth-generation development.