My Rewards Certificates are transferrable, so yes, you may redeem a certificate that was originally issued to someone else if they give it to you. However, this only works for the 5% discount or free/specially priced product options. If you try to redeem it for HawaiianMiles, the miles will not go into your HawaiianMiles account. This is due to a system limitation. You can only link one Maika‘i Card to one HawaiianMiles account. You cannot connect a second Maika‘i Card to your HawaiianMiles account. If you try to redeem someone else’s My Rewards Certificate for 200 HawaiianMiles, the miles will be deposited into that other person’s account, not yours.