Originally Posted by
guv1976
Same-day standby is free on domestic flights for all oneworld elites, and those traveling on the same PNR.
https://www.aa.com/i18n/plan-travel/...day-travel.jsp
If there's an available seat in your ticketed cabin -- after all higher-priority standbys have been accommodated -- you will be placed on an earlier flight.
Same-day means same-day.
Great on an International trip that gets in a little early, or even jumping the next flight if open..