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By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's greatest market program in Las Vegas luxury jets are drawing purchasers with their smooth silhouettes, plush cabins - and increasingly, their use of alternative fuels.

Fuel producers and jetmakers are eager to showcase unique forms of air travel fuel considered less hazardous to the environment, from utilized cooking oil to the distinctly less attractive meat waste.

Business jet operators, like airline companies, have acquiesced environmental pressure on air travel and committed to cutting in half carbon emissions by 2050 compared to 2005.

Their hope is that embracing sustainable fuel to curb emissions might make service jets more appealing to environmentally mindful buyers - particularly corporations dealing with concerns over sustainability from investors or green campaign groups.

The accessibility of less contaminating personal jets could likewise spare the abundant and well-known the negative promotion experienced by Britain's Prince Harry and his better half Meghan over a current private jet trip to southern France.

Five Gulfstream jets on screen in Las Vegas are utilizing California-produced fuel from inedible beef tallow.

The most recent waste-based fuels consist of fats, grease and oils that are by-products of the food market, stated Bryan Sherbacow, primary business officer of Boston-based biofuel manufacturer World Energy, which produces fuel from meat waste used by Gulfstream.

All of our product is inedible.

Some of the other 79 airplane on screen are expected to be powered by 150,000 gallons of other sustainable fuel mixes anticipated to be pumped at the program.

FLIGHT SHAMING

Private jets represent less than 0.1% of total annual carbon emissions worldwide, but can release, on average, up to 20 times more carbon emissions per traveler mile than jetliners, according to the London-based private charter firm Victor.

Prince Harry has actually defended his occasional usage of private jets to ensure his household's security, and has actually said that on the uncommon events he does not fly commercially he offsets his emissions.

But planemakers state occurrences such as the furore over his schedule have actually included fresh challenges for an industry already striving to justify its contribution to cutting business costs.

Incidents of flight shaming involving using personal jets are unfortunate when you consider that our market has actually delivered fuel effectiveness improvements of 40% over the previous 40 years, stated Bombardier Aviation President David Coleal.

Bombardier thinks increased sustainable fuel usage will help the market make inroads with corporations and rich buyers. According to industry information, billionaires just have a 19% business jet ownership rate.

But even an image transformation - with jets sporting sticker labels like this aircraft flies on sustainable fuels and organisers adding alternative fuel pumps for visiting planes - is unlikely to please all critics at the Oct 22-24 high-end jet event.

Environmentalists and some analysts remain skeptical that biojetfuels, generally mixed 50-50 with kerosene, will make a significant effect on public perceptions about luxury travel.

No amount of Jatropha or Brazil-nut fuel can make service jets look eco-friendly, said air travel expert Richard Aboulafia.

Demand from business jet operators for eco-friendly fuels now far surpasses supply and their interest could drive future production, Sherbacow said.

World Energy, which produces 40 million gallons of biofuel at its California plant, might expand production up to 150 million gallons by 2022.

Corporate charter companies and consultants are also seeing more interest from who want to buy carbon credits to offset emissions from their flights.

Brian Proctor, CEO of Mente Group, a U.S. consultancy, stated emissions contributed in a business jet utilization research study his company recently finished for a Fortune 500 business.

At the end of the day, I believe that rate, expense per hour, variety, speed and efficiency, that's still the (sales) chauffeur. But I believe people are becoming more familiar with the sustainability of operations and how it impacts the world. (Reporting By Allison Lampert, Editing by Tim Hepher and Alexandra Hudson)