Originally Posted by UA_Flyer

I don't think you can use unused UA ticket (travel credit) on BR. I had an itinerary with UA-NH flights, and was unable to use the travel credit due to NH was part of the itinerary, and the NH flight was a UA code-share flight.

I would suggest taking caution on purchasing BR flights from UA. UA is not a travel agent and may not have visibility into all the BR flights and inventory. On those ones UA have visibility, full fares are the only available option.

Others may have experience to share.