Even though GTS stuff doesn't show up nearly as often in American animation as it do in Japanese animation, GTS occurences in American animation are still worth noting. Unfortunately, the lack of GTS material probably stems from the fact that most Americans considered the animated medium as being merely for children and nothing more. Thankfully, this misguided era is drawing to a close thanks to the success of cartoons that are not aimed at children, such as The Simpsons, Family Guy, Futurama, and so forth.
Animation that initially aired in movie theatres that also contain those huge women we seem to love so much is archived in here. Occurences of this nature are somewhat rare due to the costs of making a movie, but when they occur it's almost always worth noting.
Obviously it's a wee bit cheaper to produce a few TV episodes than a movie, therefore there are tons more instances of giantesses popping up on television. The animation budget, and therefore quality, usually pales in comparison to what you will find in the movie theatres, but oh well, sometimes quantity over quality isn't a bad thing.