There has been a strange lack of hype around Masters of the Air. It is a huge, epic second world war drama, more than a decade in the making, filled with matinee-idol movie stars. It follows Band of Brothers and The Pacific, but moves the story from land and water to the sky. Steven Spielberg and Tom Hanks are executive producers and Dee Rees and Cary Fukunaga are among its directors. Yet it is has arrived quietly and politely. Why? It’s on Apple TV+, for one. Perhaps, too, it’s a casualty of an oversaturated age, in which too much television...