no
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Yes.No. Any two planes will be contained in infinitely many planes, not "exactly one".
Stealth-if you mean invisible to radar.I didn't know that planes could be invisible.I've never heard of any invisible planes.
It need not have any.
No. Two planes may be parallel and so may not intersect. Also, any line is the intersection of infinitely many planes, not just two.
No, they may also be parallel.