Cathay Pacific’s Asia Miles is a transfer partner of American Express, Citibank, and Capital One. Up until now it hasn’t been a great store of value, a place to transfer points and hold them, because Asia Miles expired after 36 months – this didn’t get extended with more activity in your account.
The good news is that this is changing – effective January 1, 2020 you can extend the life of your miles with any activity in your account every 18 months. Earning any miles, or redeeming any miles will extend validity.