The Southwest Airlines Companion Pass is widely considered the most valuable perk in the domestic airline industry. It allows a designated companion to fly with you for free (plus taxes and fees from $5.60) every time you purchase a flight or book one using points. To earn it, a traveler must either fly 100 qualifying one-way flights or earn 135,000 qualifying points in a single calendar year. Once earned, the pass is valid for the remainder of the year in which you qualified, plus the entire following calendar year. You can change your designated companion up to three times per year, providing significant flexibility. There are no "blackout dates" or seat restrictions for the companion; if there is a seat available for sale on the flight, the companion can take it. This effectively doubles the value of your travel budget, making it an ideal goal for couples, business travelers with families, or frequent adventurers. It is a unique loyalty benefit that has helped Southwest maintain an incredibly dedicated customer base over several decades.