Saw an email recently between a staff member and manager at ANZ that described seniority as and I quote 'rapidly becoming illegal' with reference to allocating fleet and holiday leave. It went on to mention that this was with respect to age legislation that came into force last few years in the UK. I'm guessing that it's safe until challenged in the courts which might throw the whole system into question. I also heard the DFO at BA say he thought seniority would be gone within 5 years! Not my beliefs folks, just what I've seen and heard recently.