It sure seems like American isn’t terribly interested in actually taking delivery of the A350s they have on order.
American is in the process of refreshing their longhaul fleet, which includes taking delivery of Boeing 787-8, 787-9, and 777-300ER aircraft.
American was originally supposed to start taking delivery of A350s in early 2017 — they have a total of 22 A350-900 aircraft on order. Last July American announced that they’d defer delivery of these new planes an average of 26 months, and only start taking delivery of them in late 2018. This was done to decrease capital spending, and also as a response to economic slowdowns abroad.