I have 3 airline cards-AA, JetBlue and US airway. I recently had a job transfer and I am now living on the west coast and I find that the airlines with the best price and time schedules for my travel needs are Delta and United. I have the freedom and Sapphire with Chase and the blue, green and JetBlue with AMEX-just throwing that info in -I'm not sure if there are limitations on the num of cards you can get with each co. So any good reason to apply for any of the above cards? I have great credit and last may I was approved for the Citi ex, Sapphire and US Airway cards.