Anyway possible to do this for a spell with a casting time of Standard action?
Funny you should ask that. I looked it up the other day for a certain boss fight I was preparing. I found no Pathfinder feat that lets you do it. That doesn't say there isn't one, just that I didn't find it.
Flyby attack would work, since it lets you use a standard action during your move, but then you need to be flying (and, technically, you need to have a fly speed for it to work. I think that the rules as written won't allow you to take that feat just to use with the fly spell. I could be wrong, though.
Flyby attack doesn't remove the AoO as I read it.
