From VG247: “The latest Final Fantasy 14 expansion, Shadowbringers, is now out in the wild, and its time to go on the hunt for new Aether Currents.
Aether Currents can be found all over the map. Once youve found all of the Aether Currents in certain map areas, youll be able to use a flying mount in that particular zone.”
Source: N4G PC Final Fantasy 14: Shadowbringers – all Aether Current locations