By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's biggest market show in Las Vegas high-end jets are luring buyers with their streamlined shapes, plush cabins - and significantly, their usage of alternative fuels.

Fuel manufacturers and jetmakers are eager to display novel forms of air travel fuel considered less harmful to the environment, from used cooking oil to the clearly less attractive meat waste.

Business jet operators, like airline companies, have bowed to environmental pressure on air travel and devoted to halving carbon emissions by 2050 compared to 2005.

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

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

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

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

"All of our product is inedible."

A few of the other 79 airplane on screen are expected to be powered by 150,000 gallons of other eco-friendly fuel blends anticipated to be pumped at the show.

FLIGHT SHAMING

Private jets account for less than 0.1% of overall annual carbon emissions globally, however can release, usually, up to 20 times more carbon emissions per guest mile than jetliners, according to the London-based personal charter company Victor.

Prince Harry has defended his occasional usage of personal jets to ensure 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 travel plan have included fresh challenges for a market currently aiming 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 delivered fuel effectiveness enhancements of 40% over the previous 40 years," said Bombardier Aviation President David Coleal.

Bombardier thinks increased sustainable fuel use will help the market make inroads with corporations and wealthy purchasers. According to market information, billionaires only have a 19% organization jet ownership rate.

But even an image makeover - with jets sporting sticker labels like "this airplane flies on eco-friendly fuels" and organisers adding alternative fuel pumps for going to planes - is not likely to satisfy all critics at the Oct 22-24 luxury jet occasion.

Environmentalists and some experts stay hesitant that biojetfuels, usually blended 50-50 with kerosene, will make a significant effect on public perceptions about luxury travel.

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

Demand from business jet operators for eco-friendly fuels now far exceeds supply and their interest could drive future production, 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 companies and experts are also seeing more interest from consumers who desire to buy carbon credits to offset emissions from their flights.

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

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