Which type of apple is most commonly used to make apple juice?

Go here for lots of good information:

http://www.pickyourown.org/applejuice.htm

"If you can, choose apples that are naturally sweet, like Red Delicious, Gala, Fuji, Rome and always use a mixture - never just one type. This year I used 4 bushels of red delicious and one each of Fuji, Yellow Delicious, Gala and Rome. This meant it was so sweet I did not need to add any sugar at all. And the flavor is great! The Fuji's and Gala's give it an aromatic flavor! Honeycrisp and Pink Lady are also excellent, sweet, flavorful apples."

Actually the apple isn't used to make juice. Its the core and the skins. And usually its the Red delicious, I think.