You can't use your AA miles for an upgrade on AS metal, just like I can't use my AS miles for an upgrade on AA. IF (and that's a BIG if), there is upgrade space available when you check in online or at the airport, you may be offered an upgrade for purchase. It's not likely on that route since AS elites get free upgrades. You could check on Coupon Connection and see if there are any AS MVP Gold Upgrade Coupons for trade, they can get you an immediate upgrade if U space is available.