The article.

"The Odysseus is actually a combination of three planes made up of
164-foot-long, wing-shaped structures. The planes would be launched separately
and then combine once in the stratosphere, where air is calmer. Once the craft
is fully assembled, it measures 492 feet in width and is capable of zipping
along at 140 miles per hour at an altitude of 60,000 to 90,000 feet. Solar
panels lining the top of the plane provide power, and the craft itself is
capable of autonomously changing its shape in order to maximize sunlight
exposure."

Thanks to Brad Gryder.