AA definitely uses the A321T (3-class) on the JFK/LAX route, too. I fly it monthly. I had tried JetBlue Mint, which was great, but unless you are lucky enough to snag the "solo" lie-flat seat, you're in a 2-configuration per row. Which is not terrible, of course, but AA Flagship First, guarantees you a solo seat, which has spoiled me. I'll look into Delta to see the ease of grabbing said solo seat if they do offer a comparable configuration. Still, though, per the topic of this thread, I'd surprised if AA were to pull back the transcontinental route for the Hollywood type who enjoy that setup.