E. Walter Le Roy wrote:

I'm sure it's been discussed here before but I missed it. What is the
advantage of using a face mill rather than a fly cutter?
Thanks

Normally a face mill has multiple cutters, so if it e.g. has 8 cutters it can be
fed into the workpiece 8 times as fast as a single-point flycutter. The point is
time which is money ..

GWE