The air section of “Dunkirk,” in particular, is a visual wonder—less because Nolan’s direction of the sequences is distinctive than because solo flight in combat is irresistibly, sensuously fascinating to watch, and has been so since William Wellman’s “Wings” (1927) and Howard Hawks’s “The Dawn Patrol” and Howard Hughes’s “Hell’s Angels” (both from 1930)—and the expanse of sky is all the more engulfing, thrilling, terrifying on a screen the size of an apartment building.