<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by TxLobo:
My company passed out Inspirions during the last computer upgrade. I have a New Targus adapter and it doesnt work on planes but I could not tell if it slowed down the rate of discharge, but it definitely was still discharging when plugged in.
I ended up going back to my Latitude which has a 75W power supply. With the length of trips that I take, I have to have the "Juice"........ 
</font>
Simple test.
Take the battery out, plug the adapter into the seat power outlet, and turn on the laptop. That will tell you right away whether you can draw enough power from the adapter to run the laptop.