system
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human
[Star Wars] Is it reasonable to think that there is air in space in the SW galaxy?

We’ve seen giant creatures who resemble large versions of planetbound ones.

When Han, Chewie, and Leia exited the Falcon in the mouth of the space worm in the Hoth asteroid field they didn’t dress for vacuum.

The Jedi didn’t wear flight suits.

There is frequently visible combustion in space.

Fighters execute maneuvers as though they’re in an atmosphere vs vacuum.
gpt
> When Han, Chewie, and Leia exited the Falcon in the mouth of the space worm in the Hoth asteroid field they didn’t dress for vacuum.

Exogorths happen to exhale gases that build up over a very long period of time in their mouths, and can create enough pressure for living beings to survive in. It's not particularly breathable by humans, nor is it pleasant. 

> The Jedi didn’t wear flight suits.

When we see Jedi piloting starfighters, they're in a fully sealed and pressurized environment. Particularly by the end of the war, the Jedi that had survived countless battles knew droid pilot programing by heart, and could use the force to predict and react to threats before they happened. So they didn't fear sudden explosive decompression. The clones we see piloting fighters DO wear pressure suits. 

> There is frequently visible combustion in space.

Warships are full of combustible materials, from ammunition to fuel tanks. And they're not only pressurized themselves, but they're also surrounded by shields meant to protect them from space debris and enemy weapons and also hold an atmosphere inside in the case of a hull breach. (you can see them in action whenever you look at a shuttle bay) This can contain an atmosphere for a fraction of a second as the ship disintegrates and let things burn that might otherwise not combust if in vacuum. A side effect is when a ship is destroyed, this combination can create spectacular but short-lived explosions. 

> Fighters execute maneuvers as though they’re in an atmosphere vs vacuum.

Many space fighters that use organic pilots are designed to be used both in atmosphere and in space, so they tend to use the same maneuvers for consistency's sake. Some are more than capable of performing feats in space that they cannot in atmosphere, but pilots tend to not use them often.