If you have an overnight connection, it's not possible to stand by for a connection the previous day, correct?
e.g. Current flight as ticketed:
Day 1: MIA -> DFW, arriving at 5PM
Day 2: DFW -> ORD, departing at 8:00AM
Could I stand by for any DFW -> ORD flights that are on Day 1 and skip having to get a hotel for the night?