SK3 has it correct. D-Plan is for qualifying Ford Motor Company Dealership Employees.
Again, here are the Plans from lowest (best) price up:
A/Z-Plan is for Ford Employees/Retirees and immediate family members only. Essentially it is the lowest price anyone will get unless their father owns the Dealership. It is much lower than Factory Invoice Price and you are also eligible for any publicly available Incentives.
D-Plan Pricing is for qualifying Ford/Lincoln Mercury Dealership Employees only. It is $100 more than A/Z-Plan and you are also eligible for any publicly available Incentives.
X-Plan Pricing is approximately Factory Invoice Price, then you are also eligible for any publicly available Incentives. X-Plan Pricing is for:
1 - "Friends and Neighbors" of Ford Employees (essentially anyone who does not qualify for A/Z/D-Plan).
2 - Qualified employees of "Ford Partner Companies" and "Ford Suppliers" as determined by Ford Motor Company (and those living at the same address as the Employee). Eligibility is limited to 2 PINS per year
3 - Ford Shareholders (Stockholders) are also eligible for two X-Plan PINS per year. No minimum number of share ownership required.
Hope this information helps.