So dansdeals is only about planes OR credit cards? I dont think it's right to limit the branding to a specific object.
How about a happy wallet surrounded by the words DansDeals.com?
Or better yet, have Dan try to synthesize into very short description what his site is all about, then try to brainstorm around that for a logo.
With all due respect, if you look at
http://www.unifiedmediallc.com/blog/2011/02/top-fortune-500-logos-deconstructed/ you will see that most logos actually have the full company name, and design actually goes beyond it. Very few companies will use initials for the logo (GM - but they are known by that name - if I'm not mistaken, the only one that has initials which is not commonly known by the initials, except to stock investors, is ADM).