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By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's most significant industry 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 keen to display unique types of air travel fuel deemed less damaging to the climate, from used cooking oil to the noticeably less attractive meat waste.

Business jet operators, like airlines, have acquiesced environmental pressure on aviation and committed to cutting in half carbon emissions by 2050 compared to 2005.

Their hope is that adopting eco-friendly fuel to suppress emissions might make business jets more attractive to ecologically mindful buyers - specifically corporations facing questions over from shareholders or green campaign groups.

The availability of less polluting personal jets might also spare the rich and well-known the negative publicity experienced by Britain's Prince Harry and his other half Meghan over a current private jet journey to southern France.

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

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

"All of our item is inedible."

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

FLIGHT SHAMING

Private jets account for less than 0.1% of overall yearly carbon emissions internationally, however can give off, typically, up to 20 times more carbon emissions per traveler mile than jetliners, according to the London-based private charter firm Victor.

Prince Harry has defended his periodic usage of private jets to ensure his household's safety, and has stated that on the rare celebrations he does not fly commercially he offsets his emissions.

But planemakers say occurrences such as the furore over his itinerary have added fresh challenges for a market already making every effort to validate its contribution to cutting business costs.

"Incidents of flight shaming including using private jets are regrettable when you think about that our industry has actually delivered fuel effectiveness enhancements of 40% over the previous 40 years," stated Bombardier Aviation President David Coleal.

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

But even an image transformation - with jets sporting stickers like "this aircraft flies on eco-friendly fuels" and organisers including alternative fuel pumps for visiting airplanes - is unlikely to satisfy all critics at the Oct 22-24 high-end jet occasion.

Environmentalists and some analysts stay hesitant that biojetfuels, typically mixed 50-50 with kerosene, will make a considerable effect on public perceptions about luxury travel.

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

Demand from company jet operators for sustainable fuels now far surpasses supply and their interest might drive future production, Sherbacow stated.

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

Corporate charter companies and experts are likewise seeing more interest from clients who wish to purchase carbon credits to offset emissions from their flights.

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

"At the end of the day, I think that price, cost per hour, variety, speed and efficiency, that's still the (sales) chauffeur. But I think people are ending up being more knowledgeable about the sustainability of operations and how it affects the planet." (Reporting By Allison Lampert, Editing by Tim Hepher and Alexandra Hudson)