"haloes are a quite common phenomenon in PNe, having been found in 60 per cent of elliptical PNe "
https://ui.adsabs.harvard.edu/abs/20....417C/abstract

How common are FLIERS with PNe?
Can they be seen in 16" scope and dark sites.

I have looked at both Uwe Glahn and Reiner Vogel sites looking for information as well as web searches.

Some PNe are NGC 6826 NGC 7662 IC 4593 and a list of approximately 50 others.
Thank you
Mark