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According to Gilliland, the general trend for decades has been that enplanements rise at 1.5 times GDP growth.
据Gilliland所说，几十年来的整体趋势是航空客流量按照GDP增长速度的1.5倍在上升。
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The net result is that scheduled airlines do not provide service to locations where enplanements are likely to be low.
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