True, it was a good advertisement at Boosters’ Club lunches, and all the varieties of Annual Banquets to which Good Fellows were invited, to speak sonorously of Unselfish Public Service, the Broker’s Obligation to Keep Inviolate the Trust of His Clients, and a thing called Ethics, whose nature was confusing but if you had it you were a High-class Realtor and if you hadn’t you were a shyster, a piker, and a fly-by-night.
There are no more uses of "fly-by-night" in the book.
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Their bid was a little more expensive, but I know they aren’t a fly-by-night company.
Those jars were something you might expect to find in the basement of a fly-by-night medical school, not a house full of children.
Ransom Riggs -- Miss Peregrine’s Home for Peculiar Children