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Originally Posted by Marathon Man
Above logic seems good to me.
And since your company is less inclined to like anyone flying UA but may not mind CO, you could still burn the miles you've earned on later flights with its partners such as the one I consider to be one of the world's best: Singapore Airlines?
And since Singapore Airlines IS aligned with UA and CO, this actually makes me suggest that the OP lean toward UA as well. AA might be good and all, but their other partners are no where as good in my opinion.
What I don't like is when companies try to tell ya how or whom to fly.

MM
Actually i would put BA, Cathay and Qantas up against anyone. One HUGE benefit of Oneworld vs Star is that as an EXP I can use first class rather than business class lounges. Having spent a few hours in the QF first lounge in MEL and have people come around with breakfast menus and deliver a very nice omelet and then another person come around and ask me if I wanted a spa or message treatment while I waited I really like first class lounges. The BA ones at LHR and Cathay at HKG are great also. Then there is the thread on the whisky selection in the JAL first lounge at NRT

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But flying more on either AA or UA wont change my lounge access.