See Page 10 - The Pointy Stick Rule. I suspect a high degree of fromage here...
P29 Artillery Support, 2nd paragraph:
"Place the artillery template on the table centred on the hit point. This is the artillery fire-zone. The attacking player must test for all units within the zone, including any friendly units and command units."
I would suggest that this rule overrides the issue of gunships being targeted by aa and smart missiles.
Dont forget if a gunship is used as on-table support it is treated as if a ground unit (P32) and therefore subject to "getting some" by every available unit within LOS and range.
This rule also suggests that in between orders the gunship has landed (P32 On table support, 2nd paragraph). This only strengthens my point above that the gunship is a valid target.
Furthermore the FAO cannot issue orders to ground units other than artillery so your opponent cant claim that the gunship is also receiving orders from the same source.
Hope this helps
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