Giant balloons that can carry loads over long distances could one day even transport entire buildings.
Australian firm Skylifter is developing a piloted airship that will carry up to 150 tonnes more than 1,200 miles.
They hope that the vehicles could one day carry rural hospitals and disaster-relief centres to remote areas.

The airship has been designed as a disc rather than a conventional cigar shape, which the developers say makes it easier to steer and carry heavy loads under different wind conditions.

Measuring 500ft across - the size of a football stadium - it will move using propellers which can be adjusted to change direction while the heavy weight of the load hanging underneath keeps the airship steady.

And the payload it carries will be 700 times that of a heavy cargo helicopter.

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