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ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	www.emeraldinsight.com	http://www.emeraldinsight.com/author/krystallis%2c+athanasios
ertr-164	www.emeraldinsight.com	http://www.emeraldinsight.com/author/chryssohoidis%2c+george
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s0969699708001762
ertr-164	econpapers.repec.org	http://econpapers.repec.org/paper/esswpaper/id_3a1294.htm
ertr-164	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s1366554507000518
ertr-164	www.icao.int	http://www.icao.int/annual-report-2014/pages/the-world-of-airtransport-in-2014.aspx
ertr-164	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s0261517709002386
ertr-164	doi.org	https://doi.org/10.1108/00070700510596901
ertr-164	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s0969699704000365
ertr-164	www.tandfonline.com	http://www.tandfonline.com/doi/abs/10.1080/01441640701577007
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	econpapers.repec.org	http://econpapers.repec.org/paper/esswpaper/id_3a1294.htm
ertr-164	www.icao.int	http://www.icao.int/annual-report-2014/pages/the-world-of-air-transport-in-2014.aspx
ertr-164	www.icao.int	http://www.icao.int/annual-report-2014/pages/the-world-of-air-transport-in-2014.aspx
ertr-164	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s0261517709002386
ertr-164	www.emeraldinsight.com	http://www.emeraldinsight.com/author/krystallis%2c+athanasios
ertr-164	www.emeraldinsight.com	http://www.emeraldinsight.com/author/chryssohoidis%2c+george
ertr-164	doi.org	https://doi.org/10.1108/00070700510596901
ertr-164	www.tandfonline.com	http://www.tandfonline.com/doi/abs/10.1080/01441640701577007
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu
ertr-164	www.sciencedirect.com	http://www.sciencedirect.com/science/article/pii/s0969699707000385
ertr-164	www.jstor.org	http://www.jstor.org/stable/20713564?seq=1#page_scan_tab_contents
ertr-164	ertr.tamu.edu	http://ertr.tamu.edu