Best Credit Card for Airline Miles

[socalmofo]

What are the deal on these?
Who has the best card with the least restrictions?
How much do you have to spend to get a flight?
I want to buy everything on the card and rack up a bunch of flights?
Any recommendations?

[Sleek-Jet]

Since I fly American most of the time, I have one of their cards... it's through Citi.
One mile for every purchase, and double miles for travel on American.