For several years, I have been DM mostly from credit card spend (about $250,000/yr). I have both Delta Reserves (Business and Personal) and a Delta Platinum Amex. I also have a nonDelta Platinum Business Amex. I am DM now and have over 400,000 rollover MQM so I plan to extend DM for four additional years. Since I don't need spend for status, it looks like it is better to spend on nonDelta Amex as the points can be converted to Delta or other airlines. I'm in Atlanta so I always fly Delta. I plan to drop the Delta Platinum Amex and the Delta Reserve Business. I will put my business spend on the Amex Platinum Business and get a new Amex Gold for personal spend Does this sound like a good strategy to get the most benefit from credit card spend?