Space Adventures lets you have a wide variety of zero gravity experiences from weightlessness training to heading into orbit. Space Adventures is the only company in the world currently operating commercial orbital spaceflight. They have sent two clients into space thus far and are seeking candidates interested in training to fly to the International Space Station on "taxi" missions. If you aren't ready for full astronaut training suborbital programs let you view the Earth from space and experience weightlessness. Worried about safety? 80 year-old Dorothy Simpson recently became the world's oldest woman to experience weightlessness on a Zero-Gravity flight with the company. The zero gravity trips take place in Russia since the FAA won't allow commercial parabolic flights in the United States yet.