Dec 3 (Reuters) - Most of the world's airlines are not

doing enough to switch to sustainable jet fuel, according to a

study by Brussels-based advocacy group Transport and

Environment, which also found too little investment by oil

producers in the transition.

The comments come as the airline sector calls for more

production of the fuel, which can be made from materials such as

wood chips and used cooking oil.

"Unfortunately, airlines at the moment are not on the

trajectory to have meaningful emissions reduction because

they're not buying enough sustainable aviation fuel," Transport

and Environment aviation policy manager Francesco Catte said.

As it stands, SAF makes up about 1% of aviation fuel use on

the global market, which needs to increase for airlines to meet

carbon emission reduction targets. The fuel can cost between two

to five times more than regular jet fuel.

A lack of investment by major oil players, who have the

capital to build SAF processing facilities, is hampering the

market's growth, the study says.

In its ranking, Transport and Environment pointed to Air

France-KLM, United Airlines and Norwegian

as some of the airlines that have taken tangible steps

to buy sustainable jet fuel, particularly its synthetic, cleaner

burning version.

But 87% are failing to make meaningful efforts, the ranking

shows, and even those who are trying could miss their own

targets without more investment.

Airlines such as Italy's ITA Airways and Portugal's TAP have

done very little to secure SAF in the coming years, the ranking

shows.

A TAP spokesperson said the airline was the first to fly in

Portugal with SAF in July 2022, "and is committed to flying with

10% SAF in 2030".

ITA Airways did not respond to a Reuters request for

comment.

(Additional reporting by Sergio Goncalves; Editing by Jan

Harvey)