From what I've read and IME you can have way more than 4 AUs... That is what I am wondering... The most efficient order of operations to ensure success. Like how long after closing a 4th card is it "safe" to app another, etc?Couldn't you then call recon and asked to close one card and get the new one instead?
Edit: Do AU cards count against your max of 4 personal Amex cards? I'm guessing no but want to confirm.