Cigarman:
You are right on the money. JFK-LHR is relatively crummy compared to EWR-LGW. Being from Fort Worth, I WANT to like AA. But CO is a much more pleasant experience.
My only discontent with CO is the same one everyone else has - poor southwest presence and poor Asian routings from the southwest. NW - c'mon. EVA is nice, but as pointed out elsewhere, CO charges a HUGE codeshare premium for the LAX-TPE route.
But other than Asia, CO dominates AA in most catagories.