Originally Posted by
mgcsinc
The first is standby for the first flight, but that can only (in theory) be done on the same calendar day. The second is to wait until you're at the connection point and then SDC to a later flight. However, SDCing to a later flight is considerably more difficult than SDCing to an earlier one.
The second option is what I was referring to. At that point you can SDC to a flight up to 24 hours later, if available. I've never tried though, and generally next day options are more likely to show up prior to your first leg, if my memory isn't completely failing me.