By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's biggest market program in Las Vegas luxury jets are enticing purchasers with their smooth shapes, plush cabins - and progressively, their usage of alternative fuels.

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

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

Their hope is that adopting eco-friendly fuel to suppress emissions could make company jets more appealing to ecologically mindful buyers - particularly corporations dealing with questions over sustainability from investors or green project groups.

The accessibility of less polluting personal jets could also spare the abundant and well-known the negative promotion experienced by Britain's Prince Harry and his partner Meghan over a recent private 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 consist of "fats, grease and oils that are byproducts of the food industry," said Bryan Sherbacow, chief business 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 aircraft on screen are anticipated to be powered by 150,000 gallons of other eco-friendly fuel mixes expected to be pumped at the program.

FLIGHT SHAMING

Private jets represent less than 0.1% of overall annual carbon emissions globally, but can give off, typically, approximately 20 times more carbon emissions per traveler mile than jetliners, according to the London-based personal charter company Victor.

Prince Harry has defended his periodic use of private jets to guarantee his household'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 included fresh difficulties for a market currently striving to validate its contribution to cutting corporate costs.

"Incidents of flight shaming involving making use of personal jets are regrettable when you think about that our market has provided fuel effectiveness improvements of 40% over the past 40 years," said Bombardier Aviation President David Coleal.

Bombardier believes increased sustainable fuel use will assist the industry make inroads with corporations and rich buyers. According to market information, billionaires just have a 19% business 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 checking out planes - is unlikely to please all critics at the Oct 22-24 high-end jet event.

Environmentalists and some analysts stay skeptical that biojetfuels, usually blended 50-50 with kerosene, will make a significant impact on public perceptions about high-end travel.

"No amount of Jatropha or Brazil-nut fuel can make organization jets look eco-friendly," said aviation analyst Aboulafia.

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

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 business and consultants are likewise seeing more interest from consumers 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 business just recently completed for a Fortune 500 company.

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