Surprisingly was able to redeem a bxp3 from lhr to ord for next May today. Although it took an hour through chat, the agent was able to update the original reservation on hold to a fare class that I could apply the bxp3..with only a 60 fare change ticket and then apply the upgrade properly. The only thing they could not do was apply the luxury tax for leaving lhr and indicated I would need to pay at the airport. First experience with chat and was pleasantly surprised at the experience.