If you hoard frequent-flyer miles, the next year or two could change where you can spend them. Several shifts across the big three alliances — oneworld, Star Alliance and SkyTeam — are reshaping which airlines work together, and a couple of them have deadlines attached.

The good news for beach lovers: Hawaiian Airlines officially joined oneworld on April 23, becoming the alliance's third U.S. member alongside Alaska and American, with Honolulu now a oneworld hub. oneworld is also pushing deeper into Asia-Pacific. Philippine Airlines signed an agreement in June to join, with full integration expected in 2027. That adds 31 destinations, including island spots like Boracay, Palawan and Tawi-Tawi, plus a new non-stop Manila to Chicago O'Hare route launching in November 2026. Not everyone is welcome, though: Taiwan's STARLUX has been blocked from joining, reportedly by Cathay Pacific, worried about premium long-haul competition in the Taiwan market.

Over in Star Alliance, the churn is heavier. ITA Airways, Alitalia's successor, joined in April after Lufthansa Group took control, jumping from SkyTeam. But Asiana Airlines leaves at the end of the year as its merger with Korean Air (a SkyTeam carrier) completes. Star Alliance has confirmed award bookings on Asiana flights for travel after December 17, 2026 won't be honored — so if you're sitting on Asiana miles, act. The Korean merger moves roughly 80 aircraft, 14 million frequent flyers and 90 international routes from Star to SkyTeam, giving the latter a monopoly in the Korean market and leaving ANA as Star's only Northeast Asian member. Scandinavian Airlines already made the same jump to SkyTeam in September 2024 after Air France-KLM investment.

The biggest domino still standing is TAP Air Portugal. Lufthansa Group and Air France-KLM both bid for a 44.9 percent stake, with a decision expected around late August or early September. If Lufthansa wins, TAP stays in Star Alliance; if Air France-KLM prevails, TAP is expected to move to SkyTeam and join Delta's trans-Atlantic joint venture. That would be a serious blow to Star Alliance, since Lisbon's hub anchors trans-Atlantic and Africa routes that complement Lufthansa, Swiss, Austrian and Brussels. A switch could hand SkyTeam the edge in Europe.

Meanwhile in the U.S., JetBlue and United keep deepening their Blue Sky Partnership, launched in May 2025. It works like a soft alliance: reciprocal loyalty perks, more ways to earn and redeem miles across both networks, and United gaining JFK slots from 2027. Both deny any merger plans, but for frequent flyers it's a genuine win either way.

Why should a traveller care? Because alliance membership decides whether your miles can book that dream trip — and whether they're suddenly worth less. Watch the TAP decision, use Asiana miles before the December 2026 cutoff, and note that Philippine islands and Honolulu just got easier to reach on oneworld points.