Turn your cigarette lighter in charging station for mobile devices, two USB and an extension of the cigarette lighter, which thus remains fully available for other devices, such as a GPS.
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The cigarette lighter adapter that does not lose its cigarette lighter function.
In fact you'll find two USB adapters or two gigarette lighter but finding one that offers both opportunities and provides two USB ports to power and charge your portable devices such as iPod, iPhone, PDA or MP3 player and a cigarette lighter socket for GPS, it is harder to find.
Aerodiscount found it for you.
After test, 2 x 500mA or 1A max, on a plane 2 USB and cigarette lighter, it will pull a little bit on the alternator. On older aircraft with blade regulators, it will be at the expense of battery, on new aircraft and engines, there will be no problem.
No fear of overheating, there is a system that will limit output.
Plug the adapter into a cigarette lighter socket and your relate your equipment by proper cables it will charge (single device or multiple devices low power), it will keep the load (With 2 iPad) and just maintain the charge with 2 devices plugged in.
A simple limiting discharge if you have 3 devices connected. Il will just slower down the process.