deltayankee - thanks, I take your point. But in the large airlines such as BA, I am sure that not every 777 or 747 pilot knows the cabin crew on an A321 - they operate entirely different routes with different aircraft on different schedules. They may never have crossed paths.
What about if you work for a different company but fly the same type? Would an easyJet A319 captain introduce himself to the cabin crew on a BA A319 as a matter of politeness/safety etc.?