Originally Posted by
flightline87
"Upgrades from Main Cabin to Premium Economy won't be available right away, but we'll add this functionality later. Until then, you'll be able to upgrade to Business Class from both Main Cabin and Premium Economy."
Is this a hint that SWUs from Y will only get you into W?
This seems to be more than a hint... The first specific suggestion from AA that upgrades will change, at least that I have seen.