i have a modded A10 that is build-able at US Airfield that starts with stealth i was wondering if it's possible to have it lose it's Stealth permanently until it lands at airfield?

Do you want it to change after take off or after it fires it's weapons?

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after it fires it's weapons

Check the aroura bomber. After it fires it changes speed. I can't remember exactly but I think there's a module which changes things after firing. But it could be just the locomotor

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that is the locomotor

use stealth conditions to forbid stealth when firing + stealth delay if you wish plane to be visible for some time.