By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's greatest market show in Las Vegas luxury jets are drawing purchasers with their sleek silhouettes, plush cabins - and increasingly, their use of alternative fuels.

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

Business jet operators, like airline companies, have acquiesced environmental pressure on aviation and dedicated to halving carbon emissions by 2050 compared to 2005.

Their hope is that adopting renewable fuel to curb emissions might make company jets more attractive to ecologically conscious purchasers - especially corporations dealing with concerns over sustainability from shareholders or green project groups.

The schedule of less contaminating private jets might also spare the rich and famous the negative publicity experienced by Britain's Prince Harry and his spouse Meghan over a recent private jet journey to southern France.

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

The most recent waste-based fuels include "fats, grease and oils that are byproducts of the food market," stated Bryan Sherbacow, chief commercial 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 airplane on display are anticipated to be powered by 150,000 gallons of other renewable fuel blends anticipated to be pumped at the show.

FLIGHT SHAMING

Private jets account for less than 0.1% of total annual carbon emissions internationally, but can produce, usually, approximately 20 times more carbon emissions per traveler mile than jetliners, according to the London-based personal charter company Victor.

Prince Harry has actually defended his occasional use of personal jets to ensure his family's security, and has actually stated that on the unusual occasions he does not fly commercially he offsets his emissions.

But planemakers state events such as the furore over his schedule have actually added fresh challenges for an industry already striving to justify its contribution to cutting business expenses.

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

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

But even an image makeover - with jets sporting sticker labels like "this aircraft flies on renewable fuels" and organisers adding alternative fuel pumps for going to aircrafts - is not likely to satisfy all critics at the Oct 22-24 luxury jet event.

Environmentalists and some analysts stay hesitant that biojetfuels, generally combined 50-50 with kerosene, will make a substantial effect on public perceptions about high-end travel.

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

Demand from business jet operators for eco-friendly 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 clients who wish to buy carbon credits to balance out emissions from their flights.

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

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