[quote name='Apossum']Stupid question-- are there outlets for laptops on planes? I'm taking a 12 hour flight to Buenos Aires in a few weeks.[/quote]
International flights normally have them, due to the length of the flight.
If you can find out what type of plane you're on, you might able to figure it out on your other. Calling the airline might be an idea as well.
I know the last time I flew, which was from STL to LA, I think one leg of my flight, either the direct flight back or the 2nd leg out, the plane had outlets, and I think it was a 757.