Startups are building balloons to hoist tourists 100,000 feet into the stratosphere

Commercial space flight is becoming more and more common, with companies including SpaceX, Blue Origin and Virgin Galactic all transporting paid customers into space over the last several years. People interested in seeing the earth from an unusual vantage point may soon have another option. CNBC spoke to three startups — France-based Zephalto, Florida-based Space Perspective and Arizona-based World View — that aim to hoist tourists to the stratosphere using pressurized capsules and massive gas-filled ballo ...