By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's greatest market program in Las Vegas high-end jets are luring purchasers with their smooth shapes, plush cabins - and significantly, their use of alternative fuels.

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

Business jet operators, like airlines, have actually bowed to environmental pressure on air travel and devoted to cutting in half carbon emissions by 2050 compared with 2005.

Their hope is that embracing eco-friendly fuel to curb emissions could make business jets more appealing to ecologically conscious buyers - particularly corporations dealing with concerns over sustainability from investors or green campaign groups.

The availability of less contaminating personal jets might also spare the rich and popular the negative publicity experienced by Britain's Prince Harry and his partner Meghan over a recent private jet journey to southern France.

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

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

"All of our product is inedible."

Some of the other 79 airplane on screen are anticipated 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 total annual carbon emissions internationally, but can release, on average, as much as 20 times more carbon emissions per passenger mile than jetliners, according to the London-based personal charter firm Victor.

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

But planemakers say occurrences such as the furore over his itinerary have included fresh difficulties for a market already aiming to validate its contribution to cutting business costs.

"Incidents of flight shaming involving using private jets are unfortunate when you consider that our industry has actually delivered fuel efficiency 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 rich buyers. According to market data, billionaires only have a 19% service jet ownership rate.

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

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

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

Demand from organization jet operators for sustainable fuels now far goes beyond supply and their interest could drive future production, Sherbacow said.

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

Corporate charter business and experts are also seeing more interest from clients who wish to buy carbon credits to balance out emissions from their flights.

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

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