Originally Posted by
star_world
Both airlines have identical co-pay structures now, I believe. Not sure I understand the point you're making in your post though - if it was difficult to upgrade on CO flights then why would there be empty seats in BF?
Given the reference to biz/first on UA, guessing he/she is referring to int'l flights only.
UA makes it easier/cheaper on pax to make sure C/F go out as full as possible, CO less so