Why doesn't my Macbook stay charged on an airplane using the Apple Magsafe power adapter? I have a 13" aluminum Macbook (not Pro) and an Apple Magsafe power adapter. When I use it on a plane, the light on the magnet end of the plug turns on, indicating that I am getting power, but my Macbook battery seems to discharge and eventually die as fast as normal.

I understand that airplane power isn't enough to charge the laptop, but my battery is depleted while plugged in... and it eventually dies.

I've tried removing the battery and plugging it in - the computer won't work at all.

Any idea what's going on?