I have 57,000 miles in Miles&More. The account statement says that they will expire this month. I could take a LH flight on Monday but am not sure if this will extend the 57k balance. The Miles&More terms and conditions say that the miles expire 36 months after they are accrued, so this seems to indicate that the the 57k will expire this month regardless of whether I fly on Monday.

Any thoughts?

Thanks!