By Allison Lampert

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

Fuel manufacturers and jetmakers are eager to showcase unique kinds of aviation fuel deemed less damaging to the climate, from used cooking oil to the distinctly less attractive meat waste.

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

Their hope is that adopting eco-friendly fuel to suppress emissions could make business jets more attractive to ecologically conscious buyers - specifically corporations facing questions over sustainability from shareholders or green project groups.

The accessibility of less contaminating private jets might likewise spare the abundant and well-known the unfavorable publicity experienced by Britain's Prince Harry and his wife Meghan over a current personal jet trip to southern France.

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

The current waste-based fuels include "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 utilized 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 eco-friendly fuel blends anticipated to be pumped at the show.

FLIGHT SHAMING

Private jets represent less than 0.1% of overall annual carbon emissions worldwide, but can discharge, usually, as much as 20 times more carbon emissions per traveler mile than jetliners, according to the London-based personal charter firm Victor.

Prince Harry has actually defended his periodic use of private jets to guarantee his household's safety, and has said that on the rare occasions he does not fly commercially he offsets his emissions.

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

"Incidents of flight shaming including the usage of private jets are regrettable when you think about that our industry has provided fuel effectiveness improvements of 40% over the past 40 years," said Bombardier Aviation President David Coleal.

Bombardier thinks increased sustainable fuel usage 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 makeover - with jets sporting sticker labels like "this aircraft flies on eco-friendly fuels" and organisers including alternative fuel pumps for checking out airplanes - is unlikely to satisfy all critics at the Oct 22-24 high-end jet event.

Environmentalists and some experts remain doubtful that biojetfuels, normally mixed 50-50 with kerosene, will make a substantial influence on public understandings about high-end travel.

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

Demand from service 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 as much as 150 million gallons by 2022.

Corporate charter business and experts are likewise seeing more interest from consumers who want to buy carbon credits to balance out emissions from their flights.

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

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