Red Baron is one of those classic DOS games where the original owner has been kind enough as to release it as freeware - so that all of us classic gaming aficionados can appreciate it.  Red Baron is a great plane flight simulator set in the World War I era.  It plays well under Virtual PC using either the keyboard or the mouse.  Sound works perfectly as well too:

Red Baron under Virtual PC   Red Baron under Virtual PC   Red Baron under Virtual PC   Red Baron under Virtual PC

If you want to have a shot at this game - you can download a copy from here:  http://www.dosgames.com/g_sim.php

Cheers,
Ben