Laptop power options while flying [closed]

I have noticed some laptop power supplies include a plug that allows you to connect it to a power source while flying. If I was going to go out and buy a laptop power supply for this purpose, which one should I consider?


  • The Ultimate Guide to In-Seat Laptop Power Ports
  • Another interesting read at Google Answers Laptop power on an airplane
  • Some brand wise references at this commercial site.