Purchased via AA: Deep-discount economy (O fare on AA), AUS-ORD-CDG, then return CDG-LHR-DFW-AUS. Everything is on AA metal except CDG-LHR, which is an AA codeshare operated by BA. SWU's cleared on all AA segments, but of course that doesn't touch the BA segment. I am an AA EXP / OW Emerald but have no status on BA. I do have BA miles and am an EC "Blue" member. Is there any way for me to use my BA miles to upgrade the BA segment to ClubEurope? I'll call BA this afternoon, but that's always a hassle as wait times are 10+ min in the US. Thought I'd reach out here, first. If not, it's a short flight... but why miss an upgrade?