Aero can also be gotten from the Moldwynds, or whatever they're called, in the Wind Shrine. Also, when you get to the Ronka Ruins, be sure to look out for Enchanted Fans. They know both Aera and White Wind, but you'll need to confuse them to get the latter. The dragons near the library know Transfusion, but that's not a very useful spell, so go out of your way to get it only if you're out for completion.

[EDIT] Note, too...ALL the "pages" in the Library know Blue Magic, as well.