Earlier this year the country's Defense Advanced Research Projects Agency announced plans to pay Boeing to investigate formation flight, though the program has yet to begin.
今年早些时候，美国国防高级研究计划局宣布将计划出资，请波音公司研究编队飞行，不过该计划尚未启动。
2
Earlier this year the country's Defence Advanced Research Projects Agency announced plans to pay Boeing to investigate for mation flight, though the programme has yet to begin.
今年早些时候，美国国防部高级研究计划局宣布出资让波音公司研究编队飞行的计划，但项目到现在还没启动。
3
An airline passenger might volunteer to pay $5 to $40 to offset his flight, with the price linked to distance.