Info to a FEDEX/UPS newhire wannabe...

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I am currently working for a regional airline and have been thinking about the cargo airlines. Anyone currently at FEDEX or UPS knows what happens when you first get hired? Does everyone flys sideways for a while? How long does that usualy last? Which domiciles are junior/senior? I live in SOCAL, and like to be based in ONT(UPS) or LAX(FEDEX). Also, what are typical schedules? 4on/3off, 7on/7off, or something else? Any help would be greatly appreciated.
Thanks,

Fabio.