By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's most significant industry program in Las Vegas luxury jets are tempting buyers with their smooth shapes, plush cabins - and increasingly, their use of alternative fuels.

Fuel manufacturers and jetmakers are keen to display novel kinds of air travel fuel deemed less hazardous to the climate, from utilized cooking oil to the noticeably less glamorous meat waste.

Business jet operators, like airline companies, have bowed to environmental pressure on air travel and committed to cutting in half carbon emissions by 2050 compared to 2005.

Their hope is that adopting renewable fuel to curb emissions might make business jets more appealing to environmentally conscious buyers - specifically corporations dealing with concerns over sustainability from investors or green project groups.

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

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

"All of our product is inedible."

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

FLIGHT SHAMING

Private jets account for less than 0.1% of total yearly carbon emissions globally, but can discharge, on average, approximately 20 times more carbon emissions per guest mile than jetliners, according to the London-based private charter company Victor.

Prince Harry has actually defended his periodic use of personal jets to guarantee his family's safety, and has actually said that on the rare events he does not fly commercially he offsets his emissions.

But planemakers state events such as the furore over his schedule have included fresh challenges for an industry already making every effort to validate its contribution to cutting business costs.

"Incidents of flight shaming involving making use of personal jets are regrettable when you think about that our industry has actually provided fuel effectiveness improvements of 40% over the past 40 years," stated Bombardier Aviation President David Coleal.

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

But even an image remodeling - with jets sporting stickers like "this airplane flies on sustainable fuels" and organisers adding alternative fuel pumps for checking out airplanes - is not likely to satisfy all at the Oct 22-24 high-end jet event.

Environmentalists and some experts remain skeptical that biojetfuels, usually combined 50-50 with kerosene, will make a substantial effect on public understandings about luxury travel.

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

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

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 desire to buy carbon credits to offset emissions from their flights.

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

"At the end of the day, I believe that rate, expense per hour, range, speed and performance, that's still the (sales) motorist. But I think people are becoming more familiar with the sustainability of operations and how it impacts the world." (Reporting By Allison Lampert, Editing by Tim Hepher and Alexandra Hudson)