Alliant Credit Union has a credit card that earns 3% cashback the first year and 2.5% after that. The Alliant Cashback Visa Signature Credit also comes with a $59 annual fee that is waived for the first year. You can read more about the card here.
It was previously possible to get the card only through upgrades or if you were targeted. Now Miles to Memories has received information from Alliant CU that the card is available to all members.