just reviving this old threat, I cannot seem to find clarification of the following questions before I possibly book a BD codeshare flight on UA for the first time, again because it is around 400USD cheaper to SFO!

1. If it is in W class, will it earn 100% normal miles on UA, plus my elite bonus?
2. if I enter my mileage plus number in the booking, will I be able to see it under my itineraries on UA's website, and select my preferred economy plus seating?
3. Anything else I should know that may disadvantage me by booking it via bmi?

Thanks very much