From what I remember as a SkyWest employee with US Airways benefits, I believe that parents were $25/segment, upgrades were $20 domestic or $100 overseas. 16 one-way buddy passes per year, which can include connections (PHL-ORD and PHL-CLT-ORD use the same number of passes, just different charges). Spouse could be substituted for an enrolled friend.

That's all I remember, anyone else have anything to add?