Ok, does the Sig Kadet LT-40 come wiht trim?? And does it have Ailrons??? Like do I need to by Ailrons or do they come with the kit? Also the same for the Trim do you need to buy a kit or does it come with the Sig Kadet?

The kadet does come w/ ailerons. By trim I will assume you mean covering. I'm not aware of any kits that come with covering other than precovered ARFs

By trim i mean if you are at full throutle and you are not pulling on the stick to go up and down. So you can trim the plane just like real ones. If you are going up you can trim down vise versa.

Ahh, sorry, I misunderstood you.

Yes you can trim the plane. It is done with your radio, you don't need anything extra