I'm frustrated. I found China Eastern award flights from LAX-PVG and onward. I moved a substantial amount of AMEX points to Delta. I then attempted to book - and attempted - and on and on. The award seats show until I get to the final step when it says that the seats have already been claimed. But of course they show up again and again when I attempt to book again. Is it common for Delta to show phantom availability for China Eastern?