Keep Calm and Throttle Up
It accelerates butt!
Why fly a plane? cannot answer this question in a simple way as you can see in this article from @microsiervos but has to do with the bearing capacity of generating the wings of the aircraft... so far vale may be clear, but with that generate bearing capacity? as with speed, if the aircraft does not have speed not fly more that a stone so this same can apply to almost everything, if there is no speed there is no movement so Throttle Up