By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's most significant industry program in Las Vegas high-end jets are drawing buyers with their smooth silhouettes, plush cabins - and progressively, their use of alternative fuels.

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

Business jet operators, like airlines, have acquiesced ecological pressure on aviation and devoted to halving carbon emissions by 2050 compared with 2005.

Their hope is that embracing eco-friendly fuel to curb emissions might make organization jets more attractive to ecologically conscious buyers - particularly corporations facing concerns over sustainability from investors or green project groups.

The availability of less polluting personal jets might also spare the rich and famous the negative promotion experienced by Britain's Prince Harry and his wife Meghan over a recent personal jet journey to southern France.

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

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

"All of our item is inedible."

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

FLIGHT SHAMING

Private jets account for less than 0.1% of total yearly carbon emissions worldwide, but can produce, usually, up to 20 times more carbon emissions per guest mile than jetliners, according to the London-based personal charter firm Victor.

Prince Harry has safeguarded his occasional usage of private jets to ensure his family's security, and has stated that on the unusual events he does not fly commercially he offsets his emissions.

But planemakers state occurrences such as the furore over his travel plan have actually added fresh challenges for a market currently striving to validate its contribution to cutting business costs.

"Incidents of flight shaming including the usage of personal jets are unfortunate when you consider that our market has provided fuel effectiveness enhancements of 40% over the past 40 years," said Bombardier Aviation President David Coleal.

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

But even an image transformation - with jets sporting stickers like "this airplane flies on renewable fuels" and organisers adding alternative fuel pumps for visiting airplanes - is unlikely to satisfy all critics at the Oct 22-24 luxury jet occasion.

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

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

Demand from service jet operators for renewable fuels now far goes beyond supply and their interest could drive future production, Sherbacow stated.

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

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

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

"At the end of the day, I think that rate, cost per hour, variety, speed and efficiency, that's still the (sales) driver. But I think individuals are becoming more familiar with the sustainability of operations and how it affects the world." (Reporting By Allison Lampert, Editing by Tim Hepher and Alexandra Hudson)