Originally Posted by
cbn42
Per the Citi website:
First checked bag free
For benefit to apply, at the time of booking, CitiŽ / AAdvantageŽ account must have been open at least 7 days and reservation must include the primary cardmember's American Airlines AAdvantageŽ number.
Since you signed up for the card while buying the flight, your account hadn't been open for 7 days.
This looks like the winner. A bit of a silly rule though, as it seems to take away a eason to sign up for the card while booking a flight.