Originally Posted by acoustic

Hi, I'm new to the whole frequent flying game and am wanting to get started but am weary about card churning due to my position in life. I have no debt but have a short credit history. I am trying to build my credit so that I can take out a mortgage within the next year or two. I don't want to churn cards so that my credit won't take any kind of hit but I do want to open up a new card (I currently have one with my bank) to decrease the percentage of my credit limit used. To do this I want to open a new card that waves the first annual fee and take advantage of rewards but downgrade the card (not cancel it) when the annual fee is due next year.

What credit card companies have people been most successful with when trying to downgrade to a no fee card?