By Allison Lampert

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

Fuel producers and jetmakers are eager to showcase unique forms of air travel fuel deemed less hazardous to the climate, from used cooking oil to the clearly less glamorous meat waste.

Business jet operators, like airline companies, have acquiesced ecological pressure on air travel and committed to halving carbon emissions by 2050 compared with 2005.

Their hope is that adopting sustainable fuel to curb emissions could make company jets more attractive to environmentally conscious purchasers - particularly corporations facing concerns over sustainability from shareholders or green campaign groups.

The accessibility of less contaminating private jets could likewise spare the rich and popular the negative promotion experienced by Britain's Prince Harry and his wife Meghan over a recent personal jet trip to southern France.

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

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

"All of our product is inedible."

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

FLIGHT SHAMING

Private jets account for less than 0.1% of total yearly carbon emissions internationally, however can emit, typically, up to 20 times more carbon emissions per guest mile than jetliners, according to the London-based personal charter company Victor.

Prince Harry has safeguarded his occasional usage of personal jets to guarantee his household's safety, and has said that on the unusual occasions 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 an industry currently making every effort to validate its contribution to cutting corporate expenses.

"Incidents of flight shaming including the usage of private jets are regrettable when you consider that our market has delivered fuel effectiveness improvements of 40% over the previous 40 years," said Bombardier Aviation President David Coleal.

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

But even an image remodeling - with jets sporting sticker labels like "this aircraft flies on renewable fuels" and organisers including alternative fuel pumps for going to planes - is not likely to please all critics at the Oct 22-24 high-end jet event.

Environmentalists and some analysts remain doubtful that biojetfuels, typically mixed 50-50 with kerosene, will make a considerable impact on public perceptions about high-end travel.

"No amount of jatropha curcas or Brazil-nut fuel can make business jets look eco-friendly," stated aviation analyst Richard Aboulafia.

Demand from company jet operators for renewable fuels now far exceeds supply and their interest might drive future production, Sherbacow said.

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

Corporate charter companies and specialists are also seeing more interest from consumers who wish to purchase carbon credits to balance out emissions from their flights.

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

"At the end of the day, I think that price, cost per hour, range, speed and performance, that's still the (sales) motorist. But I believe people are ending up being more familiar with the sustainability of operations and how it affects the world." (Reporting By Allison Lampert, Editing by Tim Hepher and Alexandra Hudson)