Laptop power options while flying

Question

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?

Answer 1

• 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.