The lack of Starnet blocking is extremely attractive! Makes me question my UA 1K status and is a big explanation for me moving business over to AA this year (plus, I liked the fact that AA EXPs get First Class lounge access on international flights). The one thing that keeps me linked to UA and AA is their great systemwide upgrades -- for someone like me who travels internationally quite a bit, those are a prerequisite for any program. If CO adds those ... where do I sign up?