By Allison Lampert

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

Fuel manufacturers and jetmakers are eager to showcase unique types of air travel fuel deemed less harmful to the environment, from used cooking oil to the noticeably less attractive meat waste.

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

Their hope is that embracing sustainable fuel to suppress emissions might make business jets more attractive to ecologically mindful buyers - especially corporations facing concerns over sustainability from shareholders or green project groups.

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

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

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

"All of our product is inedible."

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

FLIGHT SHAMING

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

Prince Harry has safeguarded his periodic usage of private jets to ensure his household's security, and has actually said that on the uncommon occasions he does not fly commercially he offsets his emissions.

But planemakers say events such as the furore over his travel plan have actually included fresh obstacles for an industry currently striving to justify its contribution to cutting corporate expenses.

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

Bombardier believes increased sustainable fuel use will assist the industry make inroads with corporations and rich buyers. According to market information, billionaires just have a 19% business jet ownership rate.

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

Environmentalists and some analysts remain doubtful that biojetfuels, typically combined 50-50 with kerosene, will make a significant impact on public understandings about high-end travel.

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

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

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 companies and experts are likewise seeing more interest from customers who want to buy carbon credits to balance out emissions from their flights.

Brian Proctor, CEO of Mente Group, a U.S. consultancy, said emissions played a function in a corporate jet utilization research study his company just recently completed for a Fortune 500 business.

"At the end of the day, I believe that price, expense per hour, range, speed and efficiency, that's still the (sales) driver. But I think 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)