I'm basing my question on Delta's practice of handling all complaints for their codeshare partners (KLM/AF/Virgin in particular), especially when the ticket is purchased thru Delta. I don't know how such matters are handled on AA, therefore the inquiry. I have found (with the Delta codeshares anyway) that European carriers are comparatively poor in responding and following up to issues.

That said, this trip was so disappointing that I've certainly regretted the decision to "stray".