A very good .air file manager I use is Aircraft Airfile Manager, v2.2.
It may be downloaded here:
AAM v2.2 here
It contains much better explanations of each entry in the .airfile, better graphical displays of the graph type entries, and the ability to make changes to them, and see those changes immediately, rather than having to shut down and reload the .air file, like you do in AirEd.
It's just more sophisticated, and useful, IMO, than AirEd is. It doesn't have a Save As feature, though, so there's no changing the .air file name during editing. I've also yet to figure out if it can cut-n-paste an entry from one .air file to another, which is easy and simple in AirEd.
Like anything, it has it's pluses and minuses, but over-all, I find it much preferable to AirEd for use on .air files.
all just my opinion, though...
Pat☺