A point on the Amex Platinum Charge card -- the annual fee is going up to $550 (from $450). They are also adding a $15/month Uber credit ($30 in December). If you use Uber it can be worthwhile. If you don't then it makes the card that much more expensive (especially as you need to keep the DL Plax Amex for the MQD waiver). The Delta Reserve may be a better deal -- though you get the MQD waiver at $25K spend you don't get the MQM boost until $30K spend (but I think you get 15K MQM instead of 10K)