MacBook power while flying

On my last flight (Tennessee to Californa) I noticed a passenger with a iBook that was powered off the weird little outlet in the arm rest.I would like to use my new MacBook for the duration of my next flight and need help finding a suitable power option for this. Anyone with a suggestion??
Thanks,
Tom
[email protected]

Heard of this on some other forum. I havn't tried it, but the guy that mentioned it said it worked great.
<http://www.crutchfield.com/S-EhP6nFWbFat/cgi-bin/ProdView.asp?g=850&id=detailed _info&i=539PI100>
Out of the two places I saw that sell this, this one is ten dollars cheaper.
BlackBook   Mac OS X (10.4.6)  

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