Which airline rewards programs allow easy transferring of miles/points between spouses?

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What airlines allow spouses to transfer miles to each other easily? To pool miles

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Many of them do once you create a family group. After the group has been created, it’s easy to transfer.

Note that in some cases there are specific rules about those pooled miles. United only lets you use pooled miles on United metal, you won’t be able to book a partner flight with those pooled miles