宇航局及承包商更喜欢地比较的是邮政服务与商业航空。
The comparison NASA and its contractors prefer is that of the postal service and commercial airlines.
为了给观光者更好的视角，村民们开办了直升机业务——计划首先开拓商业航空和高端旅游观光。
To give visitors a better view, villagers have started a helicopter business - a first step in a planned expansion into commercial aviation and high-end tourism.
为什么商业航空旅行一点也没有比过去快呐？
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