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Multiple Iberia Express and Iberia Airlines aircraft lined up in Barajas Airport (LEMD) Terminal 4. Busy travel period in airline hub in Spain Stock Photo - Alamy
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Airline hub-and-spoke network design based on airport capacity envelope curve: A practical view - ScienceDirect
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File:Swiss International Airlines hub Zurich Kloten airport, June 15, 2012 (7189952715).jpg - Wikimedia Commons
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