By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's greatest industry program in Las Vegas luxury jets are tempting purchasers with their sleek silhouettes, luxurious cabins - and increasingly, their usage of alternative fuels.

Fuel producers and jetmakers are keen to showcase novel kinds of air travel fuel considered less hazardous to the environment, from used cooking oil to the noticeably less attractive meat waste.

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

Their hope is that embracing renewable fuel to curb emissions might make organization jets more appealing to ecologically mindful purchasers - specifically corporations facing concerns over sustainability from investors or green project groups.

The availability of less contaminating private jets might also spare the rich and well-known the unfavorable publicity experienced by Britain's Prince Harry and his better half 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 most recent waste-based fuels consist of "fats, grease and oils that are by-products of the food market," said Bryan Sherbacow, primary business officer of Boston-based biofuel producer World Energy, which produces fuel from meat waste utilized by Gulfstream.

"All of our product is inedible."

A few of the other 79 aircraft 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 yearly carbon emissions globally, but can give off, on average, approximately 20 times more carbon emissions per passenger mile than jetliners, according to the London-based private charter firm Victor.

Prince Harry has protected his occasional usage of personal jets to ensure his family's security, and has actually said that on the unusual occasions he does not fly commercially he offsets his emissions.

But planemakers say incidents such as the furore over his travel plan have actually included fresh obstacles for a market already making every effort to justify its contribution to cutting corporate expenses.

"Incidents of flight shaming involving using personal jets are regrettable when you consider that our industry has delivered fuel efficiency improvements of 40% over the previous 40 years," said Bombardier Aviation President David Coleal.

Bombardier believes increased sustainable fuel usage will assist the industry make inroads with corporations and rich buyers. According to industry data, billionaires only have a 19% service jet ownership rate.

But even an image makeover - with jets sporting stickers like "this airplane flies on renewable fuels" and organisers adding alternative fuel pumps for visiting aircrafts - is unlikely to please all critics at the Oct 22-24 high-end jet event.

Environmentalists and some experts remain doubtful that biojetfuels, typically mixed 50-50 with kerosene, will make a substantial influence on public perceptions about luxury travel.

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

Demand from organization jet operators for eco-friendly fuels now far goes beyond supply and their interest might drive future production, Sherbacow stated.

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 consultants are also seeing more interest from consumers who desire 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 corporate jet usage study his company recently completed for a Fortune 500 business.

"At the end of the day, I think that cost, cost per hour, variety, speed and performance, that's still the (sales) motorist. But I think people are ending up being more knowledgeable about the sustainability of operations and how it affects the world." (Reporting By Allison Lampert, Editing by Tim Hepher and Alexandra Hudson)