28 February 2018
Stratolaunch

More photos here. Ars Technica:
When it flies, the Stratolaunch aircraft will be the largest aircraft ever to take to the skies.
The current record for wingspan is the Hughes H-4 Spruce Goose, which had a wingspan of 97.5 meters.
The Stratolaunch has an astonishing wingspan of 117 meters.
It has a maximum takeoff weight of 590 tons. A Boeing 747 aircraft has a maximum takeoff weight of about 300 tons.