By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's biggest market show in Las Vegas luxury jets are tempting purchasers with their smooth silhouettes, luxurious cabins - and significantly, their usage of alternative fuels.

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

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

Their hope is that adopting eco-friendly fuel to suppress emissions could make organization jets more appealing to environmentally mindful buyers - especially corporations facing questions over sustainability from shareholders or green campaign groups.

The schedule of less polluting private jets might also spare the rich and popular the unfavorable promotion experienced by Britain's Prince Harry and his spouse Meghan over a current private jet trip to southern France.

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

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

"All of our item is inedible."

Some of the other 79 airplane on screen are anticipated to be powered by 150,000 gallons of other eco-friendly fuel blends expected to be pumped at the show.

FLIGHT SHAMING

Private jets account for less than 0.1% of overall yearly carbon emissions internationally, but can discharge, typically, approximately 20 times more carbon emissions per traveler mile than jetliners, according to the London-based private charter company Victor.

Prince Harry has defended his occasional use of private 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 events such as the furore over his itinerary have actually added fresh obstacles for an industry already aiming to validate its contribution to cutting business expenses.

"Incidents of flight shaming including the usage of private jets are unfortunate when you think about that our industry has provided fuel efficiency improvements of 40% over the previous 40 years," said Bombardier Aviation President David Coleal.

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

But even an image makeover - with jets sporting stickers like "this aircraft flies on sustainable fuels" and organisers adding alternative fuel pumps for checking out planes - is not likely to satisfy all critics at the Oct 22-24 luxury jet occasion.

Environmentalists and some experts remain hesitant that biojetfuels, typically combined 50-50 with kerosene, will make a considerable effect on public perceptions about high-end travel.

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

Demand from service jet operators for sustainable 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 as much as 150 million gallons by 2022.

Corporate charter business and consultants are also seeing more interest from consumers who wish 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 usage research study his company just recently finished for a Fortune 500 company.

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