Cobra wrote:
If the planes you fly have a cigarette lighter socket, just buy a good-quality adapter and plug it in there. Anker and Aukey both make good adapters, including ones with mulltiple USB ports if you have multiple devices to power.
FWIW when I go to nascar races I have a big anker battery my buddy gave me, and it will recharge my iphone and ipad a few times over. + 1 for anker