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Why did multi-wing aircraft (two or three stacked wings) eventually fade off to single-wing aircraft?

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  • $\begingroup$ How does this affects fuel consumption $\endgroup$ – Ali Erdem Nov 23 '18 at 1:39
  • $\begingroup$ I don't think this should be marked as a duplicate. The other question asks why biplanes used to be more prevalent; this one asks why monoplanes are more prevalent now. (As of right now, this question also asks why biplanes used to be more prevalent, but I submitted an edit suggestion to remove that paragraph.) $\endgroup$ – Terran Swett Nov 24 '18 at 5:34