By Allison Lampert

LAS VEGAS, Oct 22 (Reuters) - At the world's greatest market show in Las jets are drawing buyers with their streamlined shapes, luxurious cabins - and increasingly, their use of alternative fuels.

Fuel manufacturers and jetmakers are keen to showcase novel forms of air travel fuel deemed less damaging to the climate, from utilized cooking oil to the distinctly less glamorous meat waste.

Business jet operators, like airlines, have actually acquiesced ecological pressure on air travel and dedicated to halving carbon emissions by 2050 compared with 2005.

Their hope is that adopting sustainable fuel to curb emissions could make business jets more attractive to ecologically mindful purchasers - specifically corporations facing questions over sustainability from investors or green campaign groups.

The availability of less polluting personal jets might also spare the rich and well-known the negative promotion experienced by Britain's Prince Harry and his wife 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 byproducts of the food industry," stated Bryan Sherbacow, chief business officer of Boston-based biofuel manufacturer World Energy, which produces fuel from meat waste used by Gulfstream.

"All of our item is inedible."

A few of the other 79 aircraft on screen are expected to be powered by 150,000 gallons of other eco-friendly fuel blends expected to be pumped at the show.

FLIGHT SHAMING

Private jets represent less than 0.1% of total yearly carbon emissions internationally, however 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 occasional use of private jets to ensure his household's security, and has stated that on the rare celebrations he does not fly commercially he offsets his emissions.

But planemakers state events such as the furore over his itinerary have actually included fresh challenges for an industry currently aiming to validate its contribution to cutting corporate costs.

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

Bombardier believes increased sustainable fuel use will help the industry make inroads with corporations and wealthy purchasers. According to market information, billionaires just have a 19% service 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 not likely to please all critics at the Oct 22-24 luxury jet event.

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

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

Demand from organization jet operators for renewable 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 specialists are likewise seeing more interest from clients who wish to buy carbon credits to offset emissions from their flights.

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

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