00:01 LOCAL time. Says so right on the page: If you have an existing Southwest Airlines Ticketless flight reservation, you may check in for your flight and print your Boarding Pass beginning 12:01 AM local time the day of departure. Boarding Passes may not be printed for flights that have already departed or for the following types of reservations: multi-passenger, group, senior, infant, youth, and military. David R > > What's a good midnight to use? EST, EDT. CST, CDT, MST, MDT, PST, PDT? > > > I believe that would be Herb Time, or CST for now. > > -Holly Hegeman