Received an email today and it appears there are some changes for people using the Business Credit Card.
"You will continue to earn AAdvantage® miles for your business on eligible purchases with your CitiBusiness® / AAdvantage® card. Beginning in April, these miles will be accrued in your new AAdvantage Business™ account.

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The Loyalty Points earned through purchases made on the business card will go to the individual cardmember(s). Remember, purchases made by your cardmembers also count toward earning your company more AAdvantage® miles for rewards.

Your AAdvantage Business™ profile has already been set up for you. Your new account information will be provided to you in a separate email later today. Once you receive the email, please log in to complete your profile and begin adding your travelers to start earning additional miles for business travel.

In the meantime, you can visit aa.com/aadvantagebusiness to learn more about the benefits of the program.