I just want to make sure I uderstand this. If I purchase SW early bird check in for my family ($10 per ticket) I do not have to check in on my computer to make sure I get an "A". Is this right or do I still check in, just 36 hours early instead of 24 hours early? If I don't have to check in at all, I may purchase it for the trip home. I want to be sure I understand it hough.