<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by JohnG:
Actually, if you are hoping for an op upgrade, you will want the flight to be as full/oversold as possible. If the flight is empty the chances of an op up are slim to none and slim just left town.. 
</font>
And if I cannot board within 24h I call my insurance to pay me some additional hotel nights at the hilton.