One eye-catching system is how to make flying much safer in bad weather.

Low cloud and rain - hardly perfect weather for flying. But one of the new technologies on display at the Paris Air Show may just change that.

Honeywell Aerospace hopes its new enhanced and synthetic vision systems will help make flying safer in less favourable conditions.

Their EVS/SVS display combines digital images of the surrounding terrain taken from a database, with infrared images, captured by a camera in the plane's nose cone.

This screen shows the same images that the pilots are watching in the cockpit. This area is the synthetic vision, which gives a kind of map of the terrain that we're flying over. While this box is the enhanced vision, which gives the pilots a better view of the weather that we're flying through.

The information should make it easier to land safely even when it's cloudy or dark.

Test pilot Rob Odgers.

He said, "It's easier to pick up the centre line of the runway and you can see the runway quite a bit sooner than we would. You won't see it at all on the old type."

The technology is still being tested - and it won't come cheap.

But Honeywell says it would prevent delays due to bad weather and poor visibility, and would save airlines extra fuel costs when planes have to circle before landing.

And this Gulfstream G450 jet is also demonstrating another way airlines could save on fuel costs - it's flying on biofuel.

It arrived in Paris having completed the first transatlantic journey using a 50/50 blend of biofuel and standard jet fuel, says Jim Andersen from Honeywell UOP.

Jim Andersen, business director for Honeywell UOP, said, "Overall it results in between a 60 to 85 percent reduction in greenhouse gas emissions compared to flying with traditional fossil fuel. One of the things that's been key for us is to make sure that it was a sustainable resource, so we're using feedstocks that don't compete with our food supply chain. In particular the fuel that we're flying on today was derived from camelina oil."

The engines don't need to be modified to use the biofuel - and pilots say they don't notice a difference when flying the plane.

Biofuel isn't currently produced in large quantities - but the aviation sector is backing bio.

The European Commission, Airbus, airlines and biofuel producers have just signed an agreement to speed up the commercialisation of aviation biofuels in Europe.

They hope to produce two million tonnes of sustainably-produced fuel a year by 2020.

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