Designing a physical product for a small beachhead market is a distraction when every new model has to be certified separately.

design How things should be made and judged: what makes a design good, who should do the designing, and what an interface is for.

permitting The review a project must pass before it can be built, and the argument that it now blocks more than it protects.

aviation Flying and the machines that do it: propulsion, airlines, runways, and what happened to Boeing.