It's kind of sad that I still can't parse out which route would be best for me.

Use case: I use a tool like Concur to book J on AA and use my AS number to credit the flight,

Mileage Route: Does that mean that I will only get credit for miles flown instead of the additional COS bonus that I get right now?

Revenue Route: Does that mean I get 5 SP per $1 that I spend on the full fare J ticket via AA?

I feel like these fringe cases are a perfect use case for an AI chatbot but knowing AS IT, I am not hopeful. I'm also not even hopeful that they've thought through every instance themselves.