By Allison Lampert

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

Fuel producers and jetmakers are keen to display unique types of air travel fuel deemed less damaging to the environment, from used cooking oil to the clearly less glamorous meat waste.

Business jet operators, like airline companies, have bowed to ecological pressure on air travel and dedicated to halving carbon emissions by 2050 compared to 2005.

Their hope is that embracing sustainable fuel to curb emissions might make company jets more appealing to environmentally mindful buyers - specifically corporations facing concerns over sustainability from investors or green project groups.

The availability of less contaminating personal jets might also spare the rich and famous the unfavorable publicity experienced by Britain's Prince Harry and his better half Meghan over a current personal jet journey to southern France.

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

The current waste-based fuels consist of "fats, grease and oils that are byproducts of the food market," stated Bryan Sherbacow, primary commercial officer of Boston-based biofuel manufacturer World Energy, which produces fuel from meat waste used by Gulfstream.

"All of our item is inedible."

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

FLIGHT SHAMING

Private jets represent less than 0.1% of total yearly carbon emissions worldwide, however can emit, usually, approximately 20 times more carbon emissions per passenger mile than jetliners, according to the London-based private charter company Victor.

Prince Harry has actually safeguarded his occasional usage of private jets to ensure his household's safety, and has stated that on the unusual celebrations he does not fly commercially he offsets his emissions.

But planemakers state events such as the furore over his itinerary have added fresh difficulties for an industry already aiming to validate its contribution to cutting corporate expenses.

"Incidents of flight shaming including making use of personal jets are unfortunate when you consider that our market has actually delivered fuel effectiveness improvements of 40% over the past 40 years," said Bombardier Aviation President David Coleal.

Bombardier thinks increased sustainable fuel use will help the industry make inroads with corporations and wealthy purchasers. According to market data, billionaires just have a 19% service jet ownership rate.

But even an image makeover - with jets sporting sticker labels like "this aircraft flies on eco-friendly fuels" and organisers adding alternative fuel pumps for checking out airplanes - is not likely to please all critics at the Oct 22-24 high-end jet event.

Environmentalists and some experts remain doubtful that biojetfuels, generally combined 50-50 with kerosene, will make a significant impact on public understandings about luxury travel.

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

Demand from service jet operators for renewable fuels now far surpasses 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 up to 150 million gallons by 2022.

Corporate charter companies and consultants are also seeing more interest from customers who wish 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 research study his recently completed for a Fortune 500 business.

"At the end of the day, I believe that rate, expense per hour, variety, speed and efficiency, that's still the (sales) motorist. But I believe 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)