Sometimes, an airline's rewards card isn't necessary if you fly enough with the carrier. But if you fly just a couple of times a year and like the perks that come with the card, then it could be worth ...

This card is lucrative and ideal for optimizers who don't mind putting in some work to keep track of its rewards structure. If you want a no-fuss cash-back card that requires no maintenance ...

This card offers excellent rewards — not to mention transfer partners — for an unbeatable price. It doesn't offer the perks of an airline- or hotel-branded card, though.