Adobe has detailed instructions on setting up AIR on 64-bit Linux systems. However they are missing the final step on actual installation of AIR applications. They put a rather unwieldy program under /usr/bin called "Adobe AIR Application Installer". Running this from the command line against any .air file produces this error message: unexpected error: ArgumentError: Error #2004 with no other explanation. Turns out that just running the installer ("Adobe AIR Application Installer") opens a GUI where one can select the .air file and then the installation goes through without problems. Perhaps the command line interface expects arguments in some undocumented syntax.
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Adobe AIR App Installer requires the absolute path of the .air application to be installed.