You have the in house cards and the cobranded cards. Normally, or at least IME the cobranded are easier to obtain. The issuer has a contract to push the cobranded cards. So their goal is to get those cards in as many qualified customer hands as they can.
My personal AA Plat officially closed on Christmas per my request. I opened another AA business Plat today. That should give you an idea of how important it is for Citi to keep American airlines as a client.