Originally Posted by
dmbolp
LAS-ATL in an hour shows sold out, I asked if they needed a volunteer
"Oh no, this flight isn't full"
The flight can be sold out, yet people don't check in or show up. In an ideal world even with overselling volunteers would never be needed if no-show rates were always true.
Also, OP...being a Thursday MDW-CUN flight (only one of the day) it could very likely be sold out.