Any good suggestions for a portable laptop power adapter?

[foycur]

I have been looking for a decent adapter to use with my HP Pavillion ZV5340 that I just got for Christmas. We are heading to california next week and I'm looking for an adapter to use on the airplane (I'm not sure what type of plane it is, a jet is about it). I had read reviews for the N-Charge power supply, and that looks like it's a total fraud. So, I'm wondering what companies make decent, reliable power adapters for planes.....suggestions anyone?