“And then you would do the study whether twice as many aircraft
both because they were less vulnerable to attack and because you
had twice as many aircraft and twice as much payload might do
more than most sophisticated aircraft which required more most
sophisticated pilots.”

何だか全体的に意味が、分からず、特に
“and twice as much payload might do more than most sophisticated aircraft which required more most sophisticated pilots.”
の部分が良く分からないのですが、どなたか分かりますか？

https://www.youtube.com/watch?v=MppscefbgOQ

54秒くらいからです。