Originally Posted by KennyBSAT

From the wiki:

8. Do I have to use my own AAdvantage number on applications?
Yes. The name on the card application must match the name on the AAdvantage account. You cannot apply for multiple cards for different people and use the same AAdvantage account number. AA does not care how many Citi accounts you have so there is no harm in having your AAdvantage account number associated with multiple cards in your name.


4. When should I close existing Citi accounts?
This is a matter of personal preference....Reasons to keep accounts open: Having large credit lines improves your utilization percentage. Maintaining old cards improves average age of cards. Credit lines can be moved from old cards to new cards. Reasons to close accounts: Having a large amount of available credit with Citi will eventually reduce your chances of instant approval.