Instead of AA Visa and AA Business Visa, I'd go for the AA Visa with the AA Amex for this round. Since both are personal cards, once you get one (without concurrently getting the other) you can't get the bonus until (people are reporting) 18 months after application on another personal card. Therefore getting 2 at the same time circumvents that and allows both personal bonuses to be received. Then, in your next round of churning you can include the AA Visa business.

Any particular reason why you include the USAir? The bonus doesn't seem that lucrative and they can sometimes give you a lesser card with a lower bonus.