Is this new terms? They forgot to update it to 50k..
Interestingly, the T&Cs mention the 40,000 bonus.
"First Purchase AAdvantageŽ Bonus Miles The primary cardmember will earn forty thousand (40,000) AAdvantageŽ bonus miles after a first purchase is made on the Account within ninety (90) days of Account opening and the annual fee has been paid. This one-time AAdvantageŽ bonus mileage offer is valid for first-time cardmembers with new accounts only. Existing cardmembers, existing accounts, and previous cardmember with accounts closed in the past 24 months may not be eligible for this offer. This is a limited-time offer and may be canceled at any time without notice. Please allow 4-6 weeks for AAdvantageŽ bonus miles to be deposited into your AAdvantageŽ account after the qualifying transaction has posted and your annual fee has been paid."