What is the best credit card to use for obtaining free airline tickets?

I dont want annual fees, or anything like that.

Free airline tickets for credit card usuage?

Can anyone give me some information for a good credit card to apply for that you can earn free airline tickets for each purchase you make using the card.

How can I convert credit card credit to cash?

I have an airline miles credit card. What can I buy (on credit) that I can quickly get cash for? This way I can pay off the credit with the cash and earn miles for free airline tickets.