By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's biggest industry program in Las Vegas luxury jets are enticing purchasers with their sleek shapes, plush cabins - and increasingly, their usage of alternative fuels.

Fuel manufacturers and jetmakers are eager to showcase unique kinds of aviation fuel deemed less harmful to the climate, from used cooking oil to the noticeably less glamorous meat waste.

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

Their hope is that adopting sustainable fuel to curb emissions might make service jets more appealing to environmentally conscious buyers - especially corporations facing concerns over sustainability from investors or green project groups.

The accessibility of less contaminating private jets could also spare the abundant and well-known the negative promotion experienced by Britain's Prince Harry and his partner Meghan over a recent personal jet trip to southern France.

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

The most recent waste-based fuels consist of "fats, grease and oils that are by-products of the food market," stated Bryan Sherbacow, chief commercial officer of Boston-based biofuel producer World Energy, which produces fuel from meat waste utilized by Gulfstream.

"All of our item is inedible."

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

FLIGHT SHAMING

Private jets represent less than 0.1% of overall yearly carbon emissions globally, however can emit, usually, 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 defended his periodic usage of personal jets to ensure his family's security, and has actually stated that on the unusual events he does not fly commercially he offsets his emissions.

But planemakers say occurrences such as the furore over his itinerary have actually added fresh challenges for an industry already striving to justify its contribution to cutting business costs.

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

Bombardier thinks increased sustainable fuel usage will help the industry make inroads with and wealthy purchasers. According to market information, billionaires only have a 19% company jet ownership rate.

But even an image transformation - with jets sporting stickers like "this aircraft flies on sustainable fuels" and organisers adding alternative fuel pumps for going to aircrafts - is not likely to satisfy all critics at the Oct 22-24 high-end jet occasion.

Environmentalists and some experts stay hesitant that biojetfuels, usually blended 50-50 with kerosene, will make a substantial influence on public understandings about luxury travel.

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

Demand from company jet operators for sustainable fuels now far exceeds supply and their interest might drive future production, Sherbacow said.

World Energy, which produces 40 million gallons of biofuel at its California plant, might broaden production as much as 150 million gallons by 2022.

Corporate charter companies and specialists are likewise seeing more interest from consumers who want to purchase carbon credits to offset emissions from their flights.

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

"At the end of the day, I think that rate, cost per hour, variety, speed and performance, that's still the (sales) driver. But I believe individuals are ending up being more conscious of the sustainability of operations and how it impacts the world." (Reporting By Allison Lampert, Editing by Tim Hepher and Alexandra Hudson)