The world’s largest aircraft, which can stay airborne for up to three weeks and will be vital in delivering several tonnes of humanitarian aid as well as transporting heavy freight across the world, has been unveiled. The 300-ft (91-m) ship is part plane, airship and helicopter, and there are plans to eventually use it to transport hundreds of tonnes of freight across difficult terrain throughout the world as well as deliver aid to risky areas. It is environmentally friendly, being part airship filled with inert helium, and will also be used for surveillance and communications. Developers hope to make more...