I got my Southwest boarding passes printed at Guest Services at the International gateway. The CM didn't know how to do it, but since she wasn't busy at all, she was willing to try. I just asked if she had a computer with Internet connection which she did and I just stepped her through it (so check out the airlines website before you go so that you can walk them through it if they haven't done it before). I wasn't worried about actually printing the boarding pass, since as someone else mentioned, it is easy to do while checking your bags. But I did want to get the 'A' pass, so wanted to check in. However, she had a printer and she printed them for me. Turns out the flight was so empty it really didn't matter, but you never know.