By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's most significant market program in Las Vegas high-end jets are enticing purchasers with their sleek silhouettes, luxurious cabins - and significantly, their usage of alternative fuels.

Fuel producers and jetmakers are eager to showcase unique forms of air travel fuel deemed less hazardous to the environment, from utilized cooking oil to the definitely 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 adopting eco-friendly fuel to suppress emissions might make organization jets more attractive to environmentally mindful purchasers - specifically corporations facing questions over sustainability from investors or green campaign groups.

The availability of less polluting personal jets could likewise spare the rich and popular the unfavorable promotion experienced by Britain's Prince Harry and his wife Meghan over a current personal jet journey to southern France.

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

The most recent waste-based fuels consist of "fats, grease and oils that are by-products 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 item is inedible."

Some of the other 79 aircraft on screen are expected to be powered by 150,000 gallons of other eco-friendly fuel mixes expected to be pumped at the program.

FLIGHT SHAMING

Private jets account for less than 0.1% of overall annual carbon emissions globally, but can emit, on average, approximately 20 times more carbon emissions per guest mile than jetliners, according to the London-based private charter firm Victor.

Prince Harry has defended his occasional usage of private jets to guarantee his family's safety, and has said that on the unusual occasions he does not fly commercially he offsets his emissions.

But planemakers state incidents such as the furore over his travel plan have actually included fresh challenges for an industry currently striving to justify its contribution to cutting corporate expenses.

"Incidents of flight shaming including using 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 usage will help the industry make inroads with corporations and wealthy purchasers. According to market data, billionaires only have a 19% company jet ownership rate.

But even an image makeover - with jets sporting sticker labels like "this aircraft flies on sustainable 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 remain doubtful that biojetfuels, generally mixed 50-50 with kerosene, will make a substantial effect on public understandings about high-end travel.

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

Demand from service jet operators for eco-friendly 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, might broaden production as much as 150 million gallons by 2022.

Corporate charter business and consultants are also seeing more interest from customers who want to purchase 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 recently completed for a Fortune 500 company.

"At the end of the day, I believe that cost, cost per hour, variety, speed and performance, that's still the (sales) driver. 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)