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2-for-1 flights: The best credit cards to earn companion passes and certificates

If you regularly travel with a partner, friend or family member, an airline credit card that offers a companion ticket or pass can unlock serious savings. From annual companion certificates and discounted fares to full-fledged two-for-one flight perks, several major airlines reward cardholders with the ability to bring a plus-one for little more than taxes and fees. Whether you fly Alaska Airlines, Delta Air Lines, Southwest Airlines or another carrier, here's a closer look at the top airline credit cards that offer companion benefits — and how each perk works.