In less than two hours, Desire had managed to teach everyone from the former universe how to fly.
Flying is more like a...
a unique trait of the soul. Any soul resculpted and moulded into it's durable state would conceive an impossible method of flight... something that not even the concept of humanity would find easy to understand.
Blake did not have to simply fly normally.
After he learnt the normal flight process, he then... integrated the burdens of the sky ability into it, making it possible for him to fly faster and higher than normal.
Blake's mastery of space also made it possible for him to affect space and reality while flying... without him using the first layer, Space and Time.
Plus his knowledge of the universe had deepened even more, giving him clear visage of both the governing laws and sequence particles of any space around him.