I don't think I've ever had a Citi AA Visa or Amex, only a MC. Even if I did it was eons ago and I doubt I got the signup bonus.
I'm thinking of applying for all three 75K offers (I'm not going to go for the 100K offers, since they are contingent on 10K in spending, which I don't want to commit to ATM), but I want to maximize my likelihood of being approved for all three at one. Is my best bet to apply simultaneously using three browsers (IE, FF and Chrome)??