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. 2018 Aug 21;20(9):625. doi: 10.3390/e20090625

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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MLSEB drawings of the U.S. airlines using different compact support values: (a) $1 %$ compact support; (b) $3 %$ compact support; (c) $5 %$ compact support; and (d) $10 %$ compact support.