Starkly out of place in a town of square-faced stores and steep-roofed houses, the Maycomb jail was a miniature Gothic joke one cell wide and two cells high, complete with tiny battlements and flying buttresses.
There are no more uses of "flying buttress" in the book.
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At that time, the English used the flying buttress more elegantly.
After the food arrived—Asian fusion, with lots of crispy flying buttresses of wonton and frizzled scallion, from his expression not much to his liking—I waited for him to work ’around to whatever he wanted to tell me.