Boeing's new 787 Dreamliner took to the skies on Tuesday for the first time, becoming the largest passenger jet to fly made mostly of composite materials.
The plane is on a four-hour test flight in Washington state.
The first test flight is more than two years behind the original schedule because of labour and supply problems.
The plane has attracted some 840 orders, although some have been cancelled because of the delays.
Its popularity is partly due to a lightweight design. Made of carbon and titanium, it should reduce fuel consumption as well as save on maintenance costs.