Its a Macbook Air...
I know I know the silly magnetic power cord so I can't use an iGO adaptor.
I already have iGo for my other laptops and the Apple AC/DC plane adaptor, but my issue is that I am in whY for this flight and won't have on-board seat power.
Is there any alternative to
APC Universal Notebook Battery, min. 80Wh capacity
and any suggestions for ones that big box retailers (Best Buy, Radio Shack) would have in case I want to return?