To Flybulldog, I am not sure exactly why they call it "the pig" but after my experience on an AA 727 in March I can tell you why I would call it the pig. I have told this story a couple of times under different topics. We were flying from MIA to DFW and we were experiencing some pretty rough turbulence over the gulf while flying at 31000 feet. The pilot mentioned that aircraft ahead of us had said the air was clear at 35000 but because of our weight at the time we could not climb that high, only to 33,000. So, we went to 33,000 but it was still bumpy so he came back down to 31,000 and we rode the bumps for about 25 minutes. It was pretty bad and alot of the people on board were scared. But that is my story of "The Pig". I like 727's, this was just a performance related story.