By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's most significant industry program in Las Vegas luxury jets are luring purchasers with their smooth shapes, luxurious cabins - and progressively, their usage of alternative fuels.

Fuel producers and jetmakers are keen to display novel kinds of air travel fuel considered less hazardous to the environment, from used cooking oil to the definitely less glamorous meat waste.

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

Their hope is that embracing renewable fuel to curb emissions might make business jets more attractive to ecologically mindful buyers - particularly corporations facing questions over sustainability from investors or green campaign groups.

The schedule of less contaminating personal jets could also spare the abundant and famous the unfavorable publicity experienced by Britain's Prince Harry and his better half Meghan over a recent private jet journey 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 include "fats, grease and oils that are byproducts of the food industry," said Bryan Sherbacow, chief 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 aircraft on display are anticipated to be powered by 150,000 gallons of other sustainable fuel blends expected to be pumped at the program.

FLIGHT SHAMING

Private jets represent less than 0.1% of overall annual carbon emissions internationally, but can give off, on average, up to 20 times more carbon emissions per passenger mile than jetliners, according to the London-based private charter company Victor.

Prince Harry has safeguarded his occasional usage of personal jets to guarantee his household's security, and has said that on the unusual events he does not fly commercially he offsets his emissions.

But planemakers say events such as the furore over his travel plan have actually added fresh challenges for a market already making every effort to justify its contribution to cutting corporate costs.

"Incidents of flight shaming involving the usage of personal jets are regrettable when you think about that our market has actually delivered fuel performance improvements of 40% over the past 40 years," stated Bombardier Aviation President David Coleal.

Bombardier thinks increased sustainable fuel usage will help the industry make inroads with corporations and rich buyers. 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 including alternative fuel pumps for visiting aircrafts - is not likely to please all critics at the Oct 22-24 luxury jet occasion.

Environmentalists and some analysts stay skeptical that biojetfuels, usually blended 50-50 with kerosene, will make a substantial effect on public perceptions about luxury travel.

"No quantity of Jatropha or Brazil-nut fuel can make organization jets look eco-friendly," said air travel expert Richard Aboulafia.

Demand from business jet operators for renewable fuels now far surpasses 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 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 played a role in a corporate jet usage study his business recently finished for a Fortune 500 company.

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