UA allows booking of exit-row seats to 1P and 1K members in it's FF program (ie: UA*G), however I do not know if that translates to other carriers' *G members or not - it may well do as *G's are allowed to sit in UA's Y+ section, so it is likely the same kind of computer logic at work there.
I've been able to get exit row seats out of AN, but no idea if that wa dumb luck, or *G status.
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RichardMEL, UA 1K
A Star Alliance Member.