By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's biggest industry program in Las Vegas luxury jets are luring buyers with their smooth silhouettes, luxurious cabins - and progressively, their use of alternative fuels.

Fuel manufacturers and jetmakers are keen to forms of air travel fuel considered less harmful to the climate, from used cooking oil to the noticeably less attractive meat waste.

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

Their hope is that embracing eco-friendly fuel to suppress emissions could make organization jets more attractive to ecologically conscious buyers - particularly corporations facing concerns over sustainability from shareholders or green campaign groups.

The availability of less polluting personal jets could also spare the abundant and famous the unfavorable publicity experienced by Britain's Prince Harry and his other half Meghan over a recent personal jet journey to southern France.

Five Gulfstream jets on display screen 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 business officer of Boston-based biofuel manufacturer World Energy, which produces fuel from meat waste utilized by Gulfstream.

"All of our product is inedible."

A few of the other 79 airplane on display screen are anticipated to be powered by 150,000 gallons of other renewable fuel mixes expected to be pumped at the show.

FLIGHT SHAMING

Private jets represent less than 0.1% of overall annual carbon emissions globally, but can produce, typically, up to 20 times more carbon emissions per passenger mile than jetliners, according to the London-based private charter firm Victor.

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

But planemakers state incidents such as the furore over his travel plan have actually added fresh obstacles for an industry already aiming to justify its contribution to cutting corporate expenses.

"Incidents of flight shaming including the usage of personal jets are regrettable when you think about that our industry has actually delivered fuel effectiveness enhancements of 40% over the past 40 years," stated Bombardier Aviation President David Coleal.

Bombardier thinks increased sustainable fuel use will assist the market make inroads with corporations and wealthy buyers. According to industry data, billionaires only have a 19% business jet ownership rate.

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

Environmentalists and some analysts remain hesitant that biojetfuels, usually combined 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 business jets look eco-friendly," said air travel expert Richard Aboulafia.

Demand from business jet operators for renewable fuels now far exceeds supply and their interest could drive future production, Sherbacow said.

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

Corporate charter companies and experts are likewise seeing more interest from clients who desire to purchase 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 utilization study his business just recently completed for a Fortune 500 business.

"At the end of the day, I think that cost, cost per hour, variety, 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)