[Chaos2Frozen]

Such a sobering moment... Guys, it's not like he's leaving us for good

Originally Posted by Okashira

It can be inferred that in Index the ability to fly is somewhat special, for example birds or plane's all need to "follow the rules" in order to fly, that is; they need to take into account weight, wind resistance, gravity and all other things, like flapping their wings or burn their engines, "it's part of a logical procedure" to say something.

In Index all of the "beings" that actually have the "ability" to fly seem to be special, and this is hinted by the narrative in the novels, one can check it out simply, whenever something "big" hierarchy wise is flying the description is always something like "and he/she/it left the ground like suspended by a mysterious force, even though he has wings he hasn't moved them at all (or doesn't have wings in the first place), he leaves the ground for no apparent reason, it's like if an invisible force is making them fly". It's not a "logical" procedure at all, it's like they are flying because they want to; or better yet, because they can.

Bottom line is that, when Mikoto flies, she uses the "logical means" to achieve it, and not the actual true "supernatural ones" that big things do, so she hasn't stepped on that realm at all.

I believe the term is 'unknown method of propulsion'.

Actually the book said that Magicians could easily attain flight, but the reason why they don't is because the countermeasures against flight is so simple that it overweights any benefits they could gain from flying.

Just by praying to the lord, Peter, one of the twelve apostles, had brought down a magician named Simon Magus who was said to have used demonic power to fly. Because the anti-flight spell used in that legend was developed within the Christian Church, the heretical and pagan flight spells that could be explained using Christian doctrines had fallen into a problematic dilemma where flying was easy but being made to fall to the earth was easy as well.