Let's get one thing straight. Management will attempt to get away with paying the least they can get away with, and grab the largest bonus for themselves.
If we assume that a captain earns £100,000 a year and flies 500 hours it works out at £200 per flying hour. Assuming an average of 300 passengers on a wide body that works out to 67p per passenger per hour.
When you consider that Ryanair charge at least £4 per passenger for the privilege of using a debt card it puts it into perspective.
The reality is that FD costs are a marginal cost to airlines with modern aircraft and productivity. A decent pilot saves his company more time and fuel than his salary, it's just not recognised because we don't shout about it. Next time you fly look at the fuel and time used against planned and highlight the difference in your voyage report.