Basically "bar rules" are in effect, in which if a given bar is full of pretty gals, Southern tends to go for them, but if that is not the case, then they go for pilots with "great personalities"...
Meaning that if pilots with experience in heavies, cargo, and international flying are looking for jobs, then Southern jumps at them first... But if that kind of pilot is far and few between, then they go for pilots they think can adapt and grow into the position.