Hmmm I called AA (whose miles I'd be using) and they see only 1 economy avail. Maybe partners don't see all inventory. Anyway, I put one on hold, hoping for the second to open up. Also, thank you for the DEL-BRU info.

Thanks, and I am embarrassed, I wrote DEL-LHR by mistake/habit. I corrected the post to say DEL-BRU but you had already posted by then.