paper airplane n. in aeronautics and aerospace, a flying machine that is strictly theoretical. Editorial Note: The adjectival form paper, referring to something that exists only in print or writing but not as a physical object, is fairly common. Here it connotes an actual toy-sized folded paper plane, carrying with it derogatory and jocular undertones. (source: Double-Tongued Dictionary)
Further reading
National Book Award winner Barry Lopez had wise advice for young writers. First, read widely and follow your curiosity. Second, travel or learn a foreign language. And third, find out what you truly believe, because if you’re not writing from...
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