% a few useful, frequently used, or otherwise handy commands
% very few actually as this is as far as I got!
\newcommand{\bc}{\begin{center}}
\newcommand{\ec}{\end{center}}
%

%
\newenvironment{airos}[2]%
{\textbf{#1}\newline
{#2}\newline}{}
% to get a description-like environment, but with a 
% new line after the item.
% used for the ``if operating systems ran airlines''
%