I am US Airways (not a oneworld carrier) saff and I was traveling on company business- non reving between ORD
and was upgraded to the First class cabin- without asking. However, I travelled on AA
for pleasure "again non-reving" between DFW
and was put in coach, but in the forward 777 cabin and in two very good seats. I am under the impression on long haul only AA
staff can get upgraded, however, from my edperience AA
ground staff has always been very acommodating and helpful to me while traveling speace available. The same can not be said regarding UAL which is a STAR alliance carrier.
Hopes this helps!