I never used him but my local airport, DAY, for many years had a barber, airside. He seemed to have steady work from what I saw. I can't recall when he closed up shop - maybe 5 or 6 years ago. I think it was an older guy who ran it by himself and I assume when he retired that was just the end of it. Someone mentioned that back before it was "ticketed pax only past security" he had some regular customers from the surrounding community who came to his shop. I would guess that he probably had a regular clientele from among some of the airport employees as well.