Determine Adobe AIR version on Mac OSX

Open the terminal and type (on one line):

grep -A 1 CFBundleVersion /Library/Frameworks/Adobe\ AIR.framework/Versions/Current/Resources/Info.plist

It will return something like:

<key>CFBundleVersion</key>
<string>3.5.0.600</string>

Where the string entry is the current installed version of Adobe AIR.