By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's biggest market program in Las Vegas high-end jets are enticing purchasers with their streamlined shapes, luxurious cabins - and increasingly, their use of alternative fuels.

Fuel producers and jetmakers are eager to showcase novel types of air travel fuel deemed less damaging to the environment, from used cooking oil to the distinctly less glamorous meat waste.

Business jet operators, like airline companies, have bowed to ecological pressure on air travel and devoted to halving carbon emissions by 2050 compared with 2005.

Their hope is that adopting sustainable fuel to suppress emissions could make company jets more attractive to ecologically conscious buyers - particularly corporations facing questions over sustainability from investors or green campaign groups.

The availability of less contaminating private jets could likewise spare the rich and famous the unfavorable promotion experienced by Britain's Prince Harry and his better half Meghan over a current personal jet journey to southern France.

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

The most recent waste-based fuels include "fats, grease and oils that are by-products of the food industry," stated Bryan Sherbacow, primary industrial officer of Boston-based biofuel manufacturer World Energy, which produces fuel from meat waste used by Gulfstream.

"All of our product is inedible."

A few of the other 79 aircraft on display are expected to be powered by 150,000 gallons of other renewable fuel mixes expected to be pumped at the show.

FLIGHT SHAMING

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

Prince Harry has defended his periodic usage of personal jets to guarantee his household's security, and has actually stated that on the rare celebrations he does not fly commercially he offsets his emissions.

But planemakers state incidents such as the furore over his itinerary have added fresh obstacles for an industry already making every effort to justify its contribution to cutting corporate costs.

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

Bombardier believes increased sustainable fuel use will assist the industry make inroads with corporations and rich 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 airplane flies on eco-friendly fuels" and organisers including alternative fuel pumps for visiting aircrafts - is not likely to satisfy all critics at the Oct 22-24 high-end jet occasion.

Environmentalists and some analysts stay hesitant that biojetfuels, usually mixed 50-50 with kerosene, will make a considerable effect on about high-end travel.

"No quantity of jatropha curcas or Brazil-nut fuel can make company jets look eco-friendly," stated air travel analyst Richard Aboulafia.

Demand from business jet operators for sustainable fuels now far exceeds supply and their interest could drive future production, Sherbacow stated.

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

Corporate charter companies and consultants are also seeing more interest from clients who want to buy carbon credits to offset emissions from their flights.

Brian Proctor, CEO of Mente Group, a U.S. consultancy, stated emissions contributed in a business jet usage study his business 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) motorist. But I believe individuals are ending up being more mindful of the sustainability of operations and how it impacts the world." (Reporting By Allison Lampert, Editing by Tim Hepher and Alexandra Hudson)