Sorry if the title is a little vague, I'll try to elaborate. I'm flying American to Guatemala next month and will be taking my 15" UMBP along. The 737 has in seat 110V AC power but they only accept two blade plugs. I realize that I can use the two blade adapter that came with my Magsafe but I have a bad feeling that the large brick will either get in the way or render the plug inaccessible. Is it safe to use a grounded to two blade plug adapter if the above is the case?