Hi just got my iPad Air 16gb wifi and bought a belkin case which thought was compatible. Much too big. Clueless as to the series 3, 4 speak,! Help and advice very welcome!
Congrats on your Air, I just got one about two weeks ago, on T-Mobile, and I absolutely love it.
I bought a case on Amazon from Bear Motion, it bulks up the Air but gives me some slots for business cards, a few bills or a debit card and doubles as a stand (works for me but may not be everyone's taste)
Return the case and get one that is made for the Air. The iPad 1, 2, 3, and 4 have completely different designs than the Air, so return it and get one that specifically says it is for the iPad Air