There is a flying surveillance drone the weight of a wedding ring, and one that carries 2.7 tonnes of bombs.

ECONOMIST: Robot ethics

Over and above that difference in style of flying, the two companies face exactly the same problem: weight.

FORBES: Boeing's Dreamliner and Airbus' Response

The logistics of flying could be as important as the shape, size and weight of the planes in the sky, they believe.

BBC: Sowing the seeds of tomorrow's aircraft

Safaris sometimes involve flying to remote locations in small planes that usually have a weight limit for bags, so packing light is key.

CNN: Tanzania: Make the most of your photo safari

The little man was giving away height, weight and reach to Kompany but he soared magnificently above the defender to send a flying header over Hart.

BBC: Everton 2-1 Manchester City