Originally Posted by
Mwenenzi
However, with low balances the miles will almost never be able to used and you have the real risk of miles expiry. Except for DL whose miles do not expire.
AA and UA have ways to work around that without actually flying, such as donations to one of their charities or a purchase from their shopping mall. I had a friend whose 200,000 United miles were due to expire end of March and she was able to extend them 18 months in this manner.