Just wanted to shed something positive about Delta SM retro-credit effectiveness. Since moving over the the program after both FB and OK+ program dropped the various stinkbombs on their members, I have been rather impress with the retro-credit effectiveness of the team. In my last 4-5 request from last year and just recently, they have managed to add the miles within 1-3 days and never more than 1 week. If I compare this to the other major airlines, I am very impressed. Just wish that other airlines had such an effective team. In general, I am until today, quite happy with the response and time that the Customer Service team reacts even to a lowly Gold SM member. Cheers!