I cannot believe that anyone seriously contemplating an airline career would even need to ask such a question.
Turn up at interview with a tatoo? F*ck off, get rid of that thing, then we might talk to you.
Same goes for anyone turning up with a faceful of scrap iron.
Don't like being told that? Tough - for every tattoed, pierced yoof trying for a job in the airlines, there'll be dozens more who haven't felt the need for such tribal self-inflicted injuries who will get the job ahead of them.