How high do you drop from and airplane then skydiving?

Without on board oxygen, the limit is about 15,000 feet. With on board oxygen, jumpers can go to about 20,000 feet. With bail out oxygen bottles, the altitude is limited by the type of aircraft used. The record for highest parachute jump is just shy of 103,000 feet. http://en.wikipedia.org/wiki/Joseph_Kittinger