AO
Any standard capability policy would do that. One thing I have learnt through being a rep, is that fellow employees are far more critical than any management team. It doesn't take to much effort so work out who would be a safe target for a capable management team.
The biggest single issue is that crews work as teams, but very rarely are they a team that knows the strength and weaknesses of each other in a big airline. That is the team of 15 or 10 or 4, will in all probability never fly together more than a handful of times through their entire careers. BA may have 2000 engineers, but the team breakdown is governed by shifts, who work together every day. Peer pressure about letting your mates down happens and you have competition between shifts, some good some bad.
I am not saying the flying community is unique, but there are not too many places where you have a workforce of 10000+ at one base, that don't know the in's and out's of at least 40 fellow colleagues.
I have to be really sick not to go in, because I personally know who will be working extra to cover for me. Do crew? That is not to say that anything more than a small minority of crew actually go sick because they don't care however.
With the invention of the Bradford Factor, sickness is a prime measure in redundancy situations in big workforces today, which has lead to people going in, when they should not. I will not let a cold lead to my redundancy in the future.