By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's most significant market program in Las Vegas luxury jets are enticing purchasers with their smooth silhouettes, plush cabins - and increasingly, their usage of alternative fuels.

Fuel producers and jetmakers are keen to display unique forms of air travel fuel deemed less damaging to the environment, from utilized cooking oil to the distinctly less glamorous meat waste.

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

Their hope is that embracing eco-friendly fuel to curb emissions might make company jets more appealing to environmentally mindful buyers - particularly corporations dealing with concerns over sustainability from investors or green project groups.

The schedule of less contaminating private jets might also spare the rich and popular the unfavorable publicity experienced by Britain's Prince Harry and his wife Meghan over a current private 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 fuels include "fats, grease and oils that are by-products of the food industry," said Bryan Sherbacow, primary commercial officer of Boston-based biofuel producer World Energy, which produces fuel from meat waste utilized by Gulfstream.

"All of our product is inedible."

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

FLIGHT SHAMING

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

Prince Harry has protected his occasional usage of personal jets to ensure his family's safety, and has said that on the rare occasions he does not fly commercially he offsets his emissions.

But planemakers state events such as the furore over his travel plan have actually added fresh difficulties for a market currently making every effort to justify its contribution to cutting business expenses.

"Incidents of flight shaming involving the usage of private jets are regrettable when you consider that our market has actually provided fuel efficiency improvements of 40% over the previous 40 years," stated Bombardier Aviation President David Coleal.

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

But even an image transformation - with jets sporting sticker labels like "this aircraft flies on sustainable fuels" and organisers including alternative fuel pumps for visiting planes - is unlikely to please all critics at the Oct 22-24 luxury jet event.

Environmentalists and some experts stay hesitant that biojetfuels, normally mixed 50-50 with kerosene, will make a substantial effect on public perceptions about luxury travel.

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

Demand from business jet operators for eco-friendly fuels now far surpasses supply and their interest could drive future production, Sherbacow said.

World Energy, which produces 40 million gallons of biofuel at its California plant, could broaden production up to 150 million gallons by 2022.

Corporate charter business and consultants are also seeing more interest from clients who desire to purchase carbon credits to balance out emissions from their flights.

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

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