The InFlight Power USB allows you to charge your cell phone, game system, or any other mobile device with a USB port, using the standard headphone jack found in “most airline seats”. Product page here.
The Inflight Power cable uses an internal trickle charger that takes 3-5 min to fully charge, then outputs power to the attached device (phone, music player etc). It does this repeatedly, thus the cable charges the attached device every 3-5 minutes for 1 minute or less
[via DailyTech]