NASA did not specify future commercial airtransportation needs as domestic or global.
NASA并没有指定商用航空运输需求是国内的还是全球的。
2
Tasked with improving the nation's airtransportation, NASA wants airplanes to burn 40 percent less fuel than a 777 by 2020 and 70 percent less by 2030.
And surprisingly enough, airtransportation gained an increase of 83.8 % compared with that of the same month of 2004, much more than the other three means of transportation.