Miles&Smiles is one of the best-kept secrets in travel hacking. Turkish Airlines has the largest route network in the world by country count, and the Miles&Smiles award chart has some of the lowest Star Alliance partner redemption rates anywhere — often 40–50% cheaper than booking the same seat through United or Lufthansa's programs. All five major U.S. flexible currency programs transfer 1:1. The standout sweet spot: booking United Polaris Business Class from the U.S. to Japan for just 45,000 miles.
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Transfers 1:1 to Miles&Smiles. 60,000-point bonus gives you 60,000 Turkish miles — enough for a one-way United Polaris to Japan with 15K left over.