American and Starlux have been dancing around each other for over a year. First came the interline agreement — basically a handshake letting you check bags through on a single ticket. Nice, but hardly a game-changer. Now they've moved to a full codeshare, and Starlux flights are on sale under American flight numbers for travel starting September 30, 2026.
Here's the part that actually matters for your wallet: you'll earn AAdvantage miles on those Starlux segments, but only when booked under an AA code. Book the same flight under a JX (Starlux) number and you're earning nothing in AAdvantage. This is standard codeshare behavior, but it's an easy trap to fall into if you're not paying attention to the operating carrier versus the marketing carrier.
The airlines have confirmed a broader frequent flier partnership is coming. That's the phrase that should make you pause. "In the works" in airline speak can mean anything from "next quarter" to "never." But Starlux isn't in an alliance, and American needs Pacific partners. The incentive structure aligns.
Practical takeaway: if you have travel to Taiwan or onward connections in Asia starting late September 2026, price the AA-coded Starlux options. You'll earn miles and elite qualifying dollars. Just verify the flight number starts with AA before you hit purchase. And don't redeem miles for this yet — wait for the reciprocity announcement to see if award space opens up.