The card's rewards structure isn't the easiest to remember. But its useful bonus categories, flexible rewards and outstanding welcome offer make it a top contender among cash-back cards.

For some, that won't be possible. If you fly Alaska Airlines with another person at least once a year, this card is a must-have. Be aware, however, that Alaska doesn't fly everywhere.

The JetBlue Premier Card offers more perks and more ways to earn and redeem points, but it’s also the airline’s most ...