I'm not knowledgable about this subject but do you have any sources for that?

After some quick Googling the best numbers I could find state that air travel is responsible for somewhere between 2%-4% of all human induced CO2 emissions and somewhere around 12%-15% of the emissions from transport sources.

Those percentages have outsized impact because you are emitting them very high.

So while they contribute to 4% of emissions, they may as well contribute to 8% of global warming. We don't reduce emissions just because. We want to stop the climate change.

We should just optimize the planes. I do hope that in 10 years batteries will be good enough for electric fan engines.

The problem with electric aircraft is a bit like a mini Tsiolkovsky rocket equation. In a conventional aircraft fuel is burnt off as it flies causing it to lighten and become more fuel efficient as it travels. With battery aircraft this doesn’t happen so you need more batteries upfront to travel the distance.

Captain: "Scotty, we need more lift!"

Scotty: "We're giving it all she's got. If I eject the empty batteries we might just lose enough mass, but I cannae guarantee it"

Captain: "Do it, do it, do it!"

Scotty: "Aye, captain!"

Additionally, the energy density of batteries is nowhere near that of Jet A/A-1.

Batteries do get lighter as they discharge!

Just not by enough to matter.

OK, if we’re being pedantic ;) This SE answer puts the difference between a fully charged and fully discharged Chevy Volt at half a microgram: https://physics.stackexchange.com/a/34424/134467