The abbreviation AA really shouldn't be used for acetic acid because AA is the most common name for acetic anhydride
AA isn't a name. It's an abbreviation, and I clearly noted it's association with the material under discussion (acetic acid).
If you want to go that route, abbreviations should not be used at all, as more often than not they have multiple associations. Saying one tentative association is more legitimate than another that is nearly as nebulous serves no purpose here.