By Allison Lampert

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

Fuel producers and jetmakers are eager to showcase novel forms of aviation fuel considered less hazardous to the environment, from used cooking oil to the definitely less glamorous meat waste.

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

Their hope is that adopting sustainable fuel to curb emissions could make service jets more attractive to ecologically mindful purchasers - specifically corporations dealing with concerns over sustainability from shareholders or green project groups.

The accessibility of less contaminating private jets might also spare the abundant and well-known the unfavorable publicity experienced by Britain's Prince Harry and his other 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 latest waste-based fuels include "fats, grease and oils that are byproducts of the food industry," 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 expected to be pumped at the show.

FLIGHT SHAMING

Private jets represent less than 0.1% of total annual carbon emissions worldwide, but can give off, usually, as much as 20 times more carbon emissions per passenger mile than jetliners, according to the London-based private charter firm Victor.

Prince Harry has safeguarded his occasional use of personal jets to ensure his family's safety, and has actually said that on the rare events he does not fly commercially he offsets his emissions.

But say events such as the furore over his schedule have actually included fresh difficulties for an industry already striving to justify its contribution to cutting business costs.

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

Bombardier believes 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 transformation - with jets sporting stickers like "this aircraft 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 hesitant that biojetfuels, generally mixed 50-50 with kerosene, will make a significant impact on public perceptions about luxury travel.

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

Demand from organization jet operators for eco-friendly fuels now far exceeds 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 as much as 150 million gallons by 2022.

Corporate charter companies and experts are likewise seeing more interest from consumers who want 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 usage study his company just recently finished for a Fortune 500 business.

"At the end of the day, I believe that rate, cost per hour, range, speed and performance, that's still the (sales) chauffeur. But I believe people are ending up being more familiar with the sustainability of operations and how it affects the planet." (Reporting By Allison Lampert, Editing by Tim Hepher and Alexandra Hudson)