Air Strike calculation - why doubled?

[Sir John Cope]

I don't know the why. But the same rule applies to ship fire. I believe one of the optional artillery/Indirect Fire rules also doubles the artillery fire value but then reduces the number of fires from 2 to 1. So I believe it is to keep the 3 types of units firing in sync for impact - ships and air only get one shot but are doubled, while artillery may be doubled and only get one shot depending on rules.

Rick

Thanks - good points, and probably the closest to an explanation I can reasonably hope for.