In my view the way dragoon jumps works is that they create a surface of aether to push against when they are close to the apex of their jump (not actually AT the apex because that would take way too long) and then do a 'reverse jump' off of that platform to skewer their target with great speed and precision.
Of course there is also the argument that gameplay and story separation means that the in-game dragoon jump abilities are heavily time compressed and that they actually take much longer to complete from an in-universe perspective... but then the question of how they hit dragons in the air with any sort of precision remains a complete mystery, so I'm sticking with the platform idea.
There's also the alternate idea of dragoons being able to fly using aetheric currents but that would just be cheating, now, wouldn't it?
Of course there is also the argument that gameplay and story separation means that the in-game dragoon jump abilities are heavily time compressed and that they actually take much longer to complete from an in-universe perspective... but then the question of how they hit dragons in the air with any sort of precision remains a complete mystery, so I'm sticking with the platform idea.
There's also the alternate idea of dragoons being able to fly using aetheric currents but that would just be cheating, now, wouldn't it?