When exporting to pdf (pdflatex) I get a few inputenc errors and a natbib error:
! LaTeX Error: Option clash for package inputenc. ! Package inputenc Error: Keyboard character used is undefined ! Package inputenc Error: Keyboard character used is undefined ! Package natbib Error: Bibliography not compatible with author-year citations. Changing the language encoding to UTF8 or using LuaTeX leaves only the natbib error. The files can be downloaded here: http://ftp.edpsciences.org/pub/aa/aa-package.tar.gz Note that the newest version of aa.cls is from 2012. Scott