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WikiPedia: United_Airlines http://www.airbus.com/company/market/orders-delive... http://airwaysnews.com/blog/2015/12/15/united-airl... http://www.bbc.com/vietnamese/world-39562543 http://www.boeing.com/boeing/history/chronology/ch... http://www.boeing.com/commercial/ http://business.financialpost.com/news/transportat... http://ir.united.com/phoenix.zhtml?c=83680&p=irol-... http://ir.united.com/phoenix.zhtml?c=83680&p=irol-... http://ir.united.com/~/media/Files/U/United-Contin... http://newsroom.united.com/2016-08-18-United-Appoi...