Messiah and neville.
The cost of labour is the only cost in aviation GD etc can have any real chance of influencing...aeroplanes, fuel, enroute and terminal nav charges, spares etc are all out of their sphere of influence.
Not so aircrew and ground staff.
It is not about how little they cost as a % of overall costs it is about a raw number that can be saved...until such time as they back enough people into the same corner.