These days many of the airlines have power at the seats, so it may not matter whether your laptops battery is charged or even works. You can check on-line at SeatGury to see if the airplane you are flying has this capability.
If you are flying First class and Business class most airlines offer power ports for your laptop.
If you are in Coach class it depends upon the airline and the age of the aircraft.
You can check to find out what type of aircraft you will be flying in, and which seat has a power port, by going to www.SeatGuru.com.
If you don't want to have to worry about whether there is a port, or if your battery will work for the entire flight, you might get an extra long lasting battery. www.pwrplant.com has coast-to-coast 60 watts of battery power that will work with IBM, Dell and other laptop vendors for around $100.
Lufthansa Airlines and Boeing's Connexion introduced a Wi-Fi-based, high-speed Internet Service Provider at 30,000 feet. The service costs $30 for the entire flight.
