Okay my sister left out of BWI airport I think it's called. She got on at 12:01 printed her boarding pass got A boarding. there were 6 of them, smallest children were 8 yr old and they were all able to sit together no problems.
Thanks for the update ....we will flying SW out of BWI in November and I was starting to worry about this. I plan on printing ours at 12:01 even though we have a DS 2 (other DS 7 and DS 10) that hopefully will allow us to preboard.