It was only part of the story, I think.
Боб Уайтман, could you explain to me, the native, and tiudavidharris at the same time, how do the following sentences differ?

Когда я буду лететь в Москву на самолёте, я буду читать книгу. = I will be reading a book while flying to Moscow by plane.
Я буду летать в Москву на самолёте, когда у меня будет много денег. = ?

Both are imperfective, right? How could be two different imperfective forms in Russian?