This is broadly available, BUT it is limited to one free SPRINT PERKS offer at a time.
The fine print says: “Registration for AAA benefits will replace any other Sprint Perks discount or benefit you may be receiving on your account.”
You can’t simultaneously have this, the AAdvantage Perk, or any “Sprint Perks” discounts (e.g., I get Premium for the price of Plus, and would lose that if I signed up for this instead).