I recently applied online for and received another Platinum AAdvantage Citicard to get the 25K miles. It came with a $5K credit line. I have another one with a 50K credit line. I called and asked that they increase the credit line on the new card since I normally put over $5K a month of business expenses on it and always pay on time. They turned me down, said I had to wait 6 months. I asked if they could take half of the $50k credit line on the first card and put it on the new one. They also said no to this. My credit is perfect, credit score 754. High income, no loans or mortgages, just credit cards that are always current paid in full on time. What gives?