yes you may
No. Even if a laptop has internet, it does not work while flying on an airplane, because there is no Wi-Fi on an airplane, or in the sky.
Yes, you can bring your laptop charger on an airplane in your carry-on luggage.
Well, there are some airplanes these days that have plugs for use so people can power their electronics.
The only authorized means of using a laptop for airplane travel is to disable the wireless transmitter (done through your operating system or a button/toggle switch on the laptop itself).
sleep or get a laptop.
Well on AirFrance you can take a hp laptop. I don't know about others.
jet
Yes, you will need to take the laptop out of your carry on when you go through security.
Polaroid PDV-0700 Portable DVD Player is a cheap laptop you can purchase to watch DVDs on an airplane. You can read its review at shira.net/tech-portabledvd.htm.
I don't know if I would use it in a car, but on a boat, or an airplane, it seems as though it would be useful. I think a laptop is a bit much for a car ride, but I hear they are pretty accurate and keep good GPS locks for the whole trip.
Yes, you can use a Kindle on an airplane as long as it is in airplane mode and electronic devices are allowed during the flight.
There are some power adapters that are designed for use on airplanes, but they are expensive and only offer a short addition to battery life.