A new world’s largest airplane has now made a test flight in California. It's called a Stratolaunch and has two fuselages and six Boeing 747 engines. It's purpose is to be able to drop a rocket into space that could in deploy satellites in a cheaper way than an upright rocket ship.
It was built by an engineering company called Scaled Composites.
The aircraft is so big its wing span is longer than a football field and can travel almost 190 MPH.
