Like said take a panel off your plane and take it to a auto paint store, not a hardware store. They will have a"camera" that they use to match the paint to your sample.
You want acrylic enamel, imo.
I am not a fan of spray cans. You can't get the additives you need in the paint in a spray can. Like hardener and flex agent.
I did try the Preval sprayer like showed above and didn't like it all. Don't shake it up like a spray can, it just didn't work worth a hoot for me. I probably was doing something wrong like shaking it.
A 5.99 HF spray gun is a good affordable tool for touch ups, works better than a Preval sprayer and cheaper.
Depending on what you're painting you may need flex agent like if your painting fairings.
I got a qt of paint for my plane and they matched a inspection panel a few years ago. I have used it 3 times now for my plane. Still have some left, I add reducer which makes more paint.
A 6 dollar spray gun that works well, I used it for contact cement and tossed in the garbage when I was done with it. The stand for the gun cost more than the gun.
Not pictured is the hardener/activator that helps the paint level out(makes for a nice shine) and chemically hardens the paint fast. The flex agent is for flexible stuff like bumpers and aircraft fairings.
I recently painted this fairing.