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。
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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