Big Sky is owned by MAIR Holdings which is Mesaba's parent company. Big Sky was used by MAIR to try and leverage against Mesaba pilots during their '03/'04 contract neg. It ended up backfiring in MAIRs face as the Mesaba pilots signed a scope clause that says Big Sky can't fly planes bigger than 19 seats. Thats a condensed version.
With that said, I don't know much about pilot group but I image it would be a tight group being Big Sky is small. Seems like they do EAS stuff out west and if you're from that area or want to live out there...this might be your cup of tea.
Good luck with your interviews.