Originally Posted by
mahasamatman
The term "domestic" is really misused in this forum. The actual term United uses is "Region One". That applies to various things like awards and Regional Upgrade applicability.
Series 0 used to be what they actually were for awards covering the Lower 48, Alaska and Canada. That's a sCO term but since it is still their systems for the awards I figure it still makes sense. Region One is much broader.