So I booked a backup flight I hope I don't have to use. I booked it on Southwest.com. The first leg is an AirTran flight and the second is a Southwest flight. This is what the confirmation says: What you need to know to travel: • Don't forget to check in for your flight(s) 24 hours before your trip on southwest.com or your mobile device. This will secure your boarding position on the Southwest portion of your trip. • Southwest Airlines does not have assigned seats, so you can choose your seat when you board the plane. You will be assigned a boarding position based on your checkin time. The earlier you check in, within 24 hours of your flight, the earlier you get to board. • AirTran has assigned seating. Advanced seat assignments are not available. Customers who purchase an AirTran segment on Southwest channels will be assigned a seat at the time of check in. • Once you check in, you will not be able to change your seat until arrival at the airport. • If you are scheduled to change airlines when you change planes, don't worry - we'll transfer your bags for you. So that sounds like you do get a boarding pass for the AirTran leg when you check in online, but instead of a boarding position, you get an assigned seat? Anybody run into this? The first leg is only BOS -> BWI; it's only an hour, so not a big deal.