Would the car charger B&N sells do it? Or my car charger for iPhone that has a USB port?
Yes there is. No, the car charger won't do it....airplanes don't use "normal" 12v plugin ports. You need an inverter that can plug into the aircraft power port. An inverter converts the 12v aircraft voltage to 120v AC voltage. A 75 watt inverter is fine, they cost in the $30 price range. Lots of places sell them, including places like luggage stores, Amazon, Best Buy, and so forth.
This is just one example of one that's available:
You plug your normal AC charger into the inverter and all is good. That also means you can use your normal AC charger in the airport terminal if needed.
I use the iGo power supplies, just get one with a USB port and wall, auto, and plane plane power plugs. Since I also have notebook and netbook, I can charge off of the USB port on those devices, but use the iGo power supply for the notebook and netbook. You can even get a solar charger, just sit next to a window.