It remains to be seen how weather conditions affect the air flows that make formationflight more efficient.
天气状况是如何通过影响气流来提高编队飞行的效率的，这点仍有待观察。
2
It might also be hard for airlines to co-ordinate the departure times and destinations of passenger aircraft in a way that would allow them to gain from formationflight.
航空公司可能也很难协调客机的起飞时间和目的地，使它们能够从编队飞行中获益。
3
Earlier this year the country's Defense Advanced Research Projects Agency announced plans to pay Boeing to investigate formationflight, though the program has yet to begin.