The Southwest Airlines Companion Pass has been one of the most valuable and easy-to-earn perks in the airline industry for years. This benefit, which can be earned either by flying a certain number of segments on Southwest Airlines or by accumulating a certain number of Southwest Rapid Rewards points, allows you to take a companion with you on nearly any Southwest flight free of charge (excluding taxes and fees).

Obviously, this perk is extremely valuable, especially for travelers who often take Southwest flights with a companion.