United waives the fee the first year and you can cancel after 6 months without losing the free miles you get for getting the card. The Delta Amex can be good if you fly them a lot and spend a lot on your card in general. They have double point periods from time to time and that can really blast the point levels up, but they do have a pretty steep yearly fee so you need to be putting a lot of payments onto that card to make it worth it. Overall the airline specific credit cards are not that great a deal unless you are flying a lot and paying for the flights with the card (at NetJets the company direct bills your airlines unless you use the company card so you don't get the double point benefits of most of the airline cards).