With (C-c C-e) AUCTeX allows to insert arbitrary environments. In my case I want to change the default aling-environment from
\begin{align}
\label{eq:145}
\end{align}
to insert comments in order to obtain blank lines like
%
\begin{align}
\label{eq:145}
%
%
\end{align}
%
Any suggestions?
Greetings,
R.