As far as I can tell SAF is basically used cooking oil and waste fats.

I would be amazed if there was enough SAF available to reliably supply 1% of the world’s AirBus A320 fleet.

No problem. We will make it by growing insane amount of rapeseed which will need its own fertilizer, which we will make from oil. Whole chain might produce more CO2 and might consume more oil than using normal aviation fuel, and is likely going to be quite more expensive, but we all must make sacrifices to avert climate change.

SAF is a green washing scam. Sure the next airplane engine can use it because already most modern airplanes can use it but there is no actual good reason to do so

The only sustainable option is less travel.

No, travelling by rail is sustainable. It’s a really good option for continental travel under 1000km.

Some countries are imposing extra fees on conventional aviation fuel. This is new - Air ticket prices to go up as Singapore mandates sustainable fuel for departing flights from 2026 [1].

[1] https://www.channelnewsasia.com/singapore/air-tickets-sustai...

Many countries have wanted to tax aviation fuel for a long time, but the economic downsides of having fewer planes visit your nation far outweighs any taxes collected.

I don't see how requiring SAF would be any different.