I think they should still cost 5. The Wizards.com FAQ for revised (2004 edition) says AA guns can target fighters or bombers separately. So the AA guns are no stronger in AA50. They are actually weaker because they no longer fire on planes passing over-head like they did in revised.
AA Boardgame Survey
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Found this on the AH/WOTC site. Very important to fill out if you want to voice your opinion and help Larry make some more AAgames and more strategic games for that matter.
Here’s the link:
http://forums.gleemax.com/announcement.php?f=747:-)
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good. i didnt see this, i posted it in the AA42 section as well.