There is a critical flaw with trying to find a cost of a contract. Airlines (even Delta) are not able to accurately predict the cost of each section of a contract.

It is like an owner of a grocery store trying to see what their 5 year profits will be if they increase the price of crackers. Once the price changes, the market changes. People may start to find cheaper alternatives such as chips.

Airline costs and profits are much harder to predict than most businesses. There are too many variables. Not only do they have to make wild guesses about future loads and route structures (that change weekly), they have to predict how the pilots will respond. Maybe improved deadhead language will make deadheads cost more to the company. They may respond by taking a 3 day trip that ended with a deadhead and adding another day in order to make the crew operate a flight rather than deadhead. That may then cause commuters who liked to deviate to bid off that aircraft. That will cause an increase in training costs that may be greater than the deadhead.

The cost of a contract is dynamic. Language that may start out expensive on day one might be cheap by the end of the first year. Other language that started out cheap might end up costing the most by the end of the contract.