Vivid Seats offers tickets for all kinds of events, including concerts and sporting events. Right now, when you book tickets through Vivid Seats, you can earn 3 x AA miles/USD. Access it here: https://american.vividseats.com/. This link cannot be stacked with other cashback portals such as Ebates and TopCashback, though 3 x AA currently appears to be the best available rate. When making a purchase, you need to enter your own AA account number; you can also, preferably, enter your LD's account.
There are often cross-program promotions between loyalty programs. For more details, see: Summary of cross-program partnerships among frequent traveler programs
