A. Depends on aircraft and base
All CRJ pilots (and their families) get United and Delta
CRJ pilots in ORD, PHX, LAX and Aspen dedicated pilots get AA
All E175 pilots get United.
E175 Pilots in SEA, SFO, LAX, BOI also get Delta
E175 Pilots in SAN, PDX, SEA also get Alaska
All employees get flight benefits on SkyWest operated Alaska flights
Additionally, all pilots can jumpseat on a very long list of companies (some 85+ different companies)
SkyWest employees and their family members can get ZED fares (standby travel at a lower priority for a small fee) on some 70+ companies around the world

B. Depends where you are trying to commute to. Denver or Minneapolis, not so bad. Houston... usually a lot of competition on those flights