a. + airliner >>共 150
commercial 16.89%
hijacked 11.10%
civilian 4.69%
russian 4.56%
domestic 3.82%
iranian 3.58%
sudanese 2.71%
american 2.59%
chinese 2.34%
egyptian 2.22%
commercial + n. >>共 937
flight 3.37%
aircraft 2.01%
service 1.69%
use 1.69%
airline 1.51%
success 1.29%
interest 1.28%
development 1.19%
activity 1.19%
satellite 1.15%
airliner 0.92%
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