https://www.cnbc.com/2019/04/13/stratolaunch-first-flight-worlds-biggest-airplane-built-for-rockets.html

Aviation has a new number one in size, as a one-of-a-kind airplane completed its first test flight on Saturday morning above California's Mojave desert, people familiar with the flight told CNBC.

The test makes the immense Stratolaunch the largest airplane in the world to fly, with a wingspan measuring 385 feet -- wider than a football field is long. With two fuselages and six Boeing 747 engines. Stratolaunch is built to launch rockets from the air.