a. + airline >>共 754
major 8.79%
national 4.93%
commercial 3.79%
the 3.48%
foreign 3.33%
european 2.93%
domestic 2.81%
international 2.68%
new 2.68%
regional 2.44%
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%
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