“Masters of the Air,” Apple TV+’s World War II miniseries, has been a labor of love in every conceivable way. Even backed by Hollywood heavyweights Tom Hanks, Steven Spielberg and Gary Goetzman, who previously worked on HBO’s World War II miniseries “Band of Brothers” and “The Pacific,” the scale of the project proved to be the biggest challenge — particularly how to bring the air war to life in a convincing way. And it took more than a decade and a change in network backing to get this project onto TV screens. “Ten years ago, the technology wasn’t there,” Goetzman...