Delta is cannibalizing their co-brand credit cards with this offer, particularly the AmEx Gold Card. I have an AmEx Delta Gold card. I don't spend on it, but keep it for, well, the subtle perks like Main1 boarding. I received an email this morning for SkyMiles Select. I might just very well cancel my AmEx Delta Gold card at renewal, and buy Delta's SkyMiles Select at a fraction of the price.