Way I figure it is, no matter what fanfic says it's not certain within the show that she'll never be able to fly on her own. In which case, attaching something to her like Tank's copter thingy would deprive her of needed practice.
Well, in the show, it did say that when pegasi and unicorns are babies, their abilities come in random bursts, so maybe that's why Pumpkin and Pound learned to use them so quickly? And it could also be that Scootaloo is just not a good flyer. XD
it's not that,the wings of a little baby would be just right to hold the weight,it seems that even tough Scootaloo is a filly,her wings are big and strong enough to hold her wieght in flying,i'm guessing wings grow very slow.
Has anyone considered that Scoots might just have some sort of muscle deficiency? People are always making fun of her, but can you imagine not being capable of walking and being mocked by huge amounts of people?
I actually have a little comic dedicated to the fact that Scoots can't quite fly yet, and who her mystery parents are. It's kinda dorky, but it makes me happy. This is cute! Scootaloo is best crusader.
Okay. Here's me WAAAAY over-thinking ponies, but this is my theory:
Ponies are born with a pool of magic. The amount of magic for a pegasus foal is more than enough to assist them to fly. However, as they grow, their bodies (at least initially) grow faster than their pool of magic. Eventually, it isn't enough to give them the lift they need to fly. As Scootaloo grows, her magic growth will catch up to her physical growth, thus enabling her to fly again. In other words, Scootaloo could fly as a foal, got bigger than her magic could handle, and now has to wait until her magic catches up so she can fly again.
Rainbow Dash, though, could fly at that age and even perform a Sonic Rainboom because she's Rainbow freakin' Dash.