What is the difference between stealth aircraft and commercial aircraft?

Stealth aircraft are made so they don't show up on radar very well, or at all. This is important if you're going out to blow something up and don't want to be seen.

Commercial aircraft could not be stealth aircraft because you really need to be able to see one on radar. Air Traffic Control uses radar to detect aircraft in its area, other planes use radar to detect you in the sky...having a commercial plane that couldn't be seen on radar would be very bad.

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the difference is like police and thief.