At Mesa, of course we had 3 airline partners, (USAir, America West, and United), and you got benefits on whichever mainline system you were assigned. We all got AWA benefits....just for working for Mesa. Standby, non-rev for free, space available for Mom, Dad, and Wife & Kids. If you were in the AWA system, though, (PHX based), you had no United or USAir bennies.
If you were in the United System, you got the same thing for United, Standby non-rev for free, for Mom, Dad, Wife & Brats. You also got the AWA bennies. No USAir bennies.
It was a bit different in the USAir system. You get the AWA bennies, no United bennies. But for your USAir bennies, you had to be a USAir Employee Travel card (good for 1 year) to get your bennies. I think it cost somewhere around $100 bucks. That made you, you Wife & Rugrats, and Mom and Pop good to nonrev on USAir.
By the way, bennies are not just good on mainline and Mesa, they were good on ANY flight operating under the United or USAirways name (Skywest, CHQ, MA, PSA, whatever)
Oh yeah, SWA standby was $25 bucks a leg. ID90's on anybody.
Later!