Has Air ever been used.

We have a number of Windows 7 computers that have Air installed. The versions of Air vary from 1.1 up to 18.0. I need to determine if Air has ever been activated on these systems. By that I mean has an Air app ever been run. I suspect that most of these computers have never run an Air app since auto update (the default) has not run. If I can determine if Air has never been used then it will be uninstalled. I have looked in the Windows registry and in the file system but haven't found anything that might indicate if Air has been used.

Thanks.