By Allison Lampert

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

Fuel producers and jetmakers are keen to showcase novel kinds of aviation fuel considered less harmful to the environment, from utilized cooking oil to the definitely less attractive meat waste.

Business jet operators, like airlines, have bowed to environmental pressure on aviation and dedicated to halving carbon emissions by 2050 compared to 2005.

Their hope is that embracing eco-friendly fuel to suppress emissions could make company jets more appealing to ecologically mindful purchasers - especially corporations dealing with questions over sustainability from shareholders or green campaign groups.

The accessibility of less polluting private jets could also spare the abundant and well-known the unfavorable promotion experienced by Britain's Prince Harry and his other half Meghan over a recent private jet journey to southern France.

Five Gulfstream jets on 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 market," said Bryan Sherbacow, chief commercial officer of Boston-based biofuel producer World Energy, which produces fuel from meat waste used by Gulfstream.

"All of our item is inedible."

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

FLIGHT SHAMING

Private jets account for less than 0.1% of total annual carbon emissions globally, however can produce, on average, as much as 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 use of personal jets to ensure his household's security, and has said that on the uncommon events he does not fly commercially he offsets his emissions.

But planemakers say incidents such as the furore over his travel plan have added fresh challenges for an industry already striving to justify its contribution to cutting corporate costs.

"Incidents of flight shaming including using personal jets are unfortunate when you think about that our industry has actually provided fuel efficiency improvements of 40% over the past 40 years," stated Bombardier Aviation President David Coleal.

Bombardier believes fuel usage will help the market make inroads with corporations and wealthy purchasers. According to market information, billionaires just have a 19% service jet ownership rate.

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

Environmentalists and some experts stay skeptical that biojetfuels, generally combined 50-50 with kerosene, will make a substantial effect on public perceptions about high-end travel.

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

Demand from company jet operators for eco-friendly fuels now far surpasses 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 specialists are likewise seeing more interest from customers 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 played a role in a corporate jet utilization research study his company recently finished for a Fortune 500 company.

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