If you sign up for an American Express Platinum card and designate AA as your airline, $200 worth of "incidentals" (such as bag or seat fees) are reimbursed. In addition you will gain lounge access from a variety of partners (Centurion, Priority Pass, Escape).
The annual fee is $550, but you'll get the $200 back for the fees, plus a sign up bonus (according to my app referral page) of at least 60000 points, plus the additional credits of $200/yr in Uber credits (monthly installments), and $100 for Saks (two installments).