paper airplane
 n.— «Aviation has a long history of what people call “paper airplanes”—some guy comes along who’s going to build a new plane that goes 1,000 miles an hour and only costs $200 to fly, and he raises money and is never heard from again.» —“Founder of firm creating ‘cheap’ jet to speak at DWC” by Dave Brooks Nashua Telegraph (N.H.) Apr. 6, 2005. (source: Double-Tongued Dictionary)

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