Looking for some advice regarding what FF program to credit upcoming miles from RT DEN-MUC flights (on US) for my wife. DEN-PHL is in A and PHL-MUC is in Z class both ways. I am crediting my miles to A3 as this will put me right at *A Gold based on booking class bonuses for A3. For my wife any advice on what FF program to credit to? She is not concerned about status on any airline as she does not fly enough. So current thinking would be to credit miles to her AC account as we have redeemed miles on AC for overseas trips after transferring in miles from AMEX MR, Starwood, etc. Any thoughts and/or other ideas on other *A programs to credit to?