$40 back on $80 at Booking.com – works for existing users (go through aa.com)

Credit: Frequent Miler
Deal:
American Airlines is offering a link for $40 back on a booking of $80 or more at Booking.com. This offer has no listed expiration date that I can see, so I’m not sure how long it will be around, but it could be a good way to save a few bucks.
The Deal
$40 back on $80 or more at Booking.com
No exclusion for existing accounts
This promotion is very simple — just go to aa.com and click on the link under "news and offers". That’s it — at some point after you make your stay, you should get $40 refunded back to your credit card (note that the terms state that you can not pay via American Express — I assume Booking.com does not accept Amex). Once you click through AA.com, you should see the green banner shown in the screenshot below confirming that you’ll get $40 back with a minimum booking cost of $80.
Key Terms
To obtain the reward as a credit to their credit card, the Participant has, within a reasonable time after the stay, either created a user account and saved a valid credit card in the account settings or provided a valid credit card on the provided digital form. American Express is not currently an accepted credit card.
Booking.com will only recognize one Eligible Reservation per Participant, per campaign to count for an Incentive Bonus. Participants may only receive Incentive Bonuses from a maximum of 3 different campaigns per year, including Refer-a-Friend campaigns.
Valid one time only per user.