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Airlines created miles or points programs to encourage loyalty. The programs would be irrelevant if they permitted transfers to their competitors.

British Airways Avios points cannot be transferred to any other program.

Many airlines allow transfers, with restrictions, through points.com. This does not mean that miles or points can be transferred between every combination of programs mentioned on their website. When transfers are permitted it is typical to lose 80% of the value.

https://www.points.com/