Unsure if Star still have RTW mileage based tickets
Typical?
https://www.airnewzealand.co.nz/round-the-world-fares
https://www.airtravelgenius.com/roun...-tickets/#star
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5. Star Alliance Round The World Tickets
Star Alliance offers 3 mileage based Round-The-World tickets – with a maximum of 29,000 miles (RWSTAR1), 34,000 miles (RWSTAR2) and 39,000 miles (RWSTAR3). These are available in economy, premium economy, business class and first class.
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Cost will vary by route, due to real government/regulatory/airport fees
With 1.3M UA ff miles I would be looking to spend some. They will not increase in value.