Ford employees and retirees can give out X-plan discounts to all their friends and extended family members (close family members get to share in their A/Z plan). Matter of fact, Ford encourages them to do this. A sale is a sale.
Various other groups, like employees of Ford suppliers, can get the X-plan directly for themselves (no employee involved), but can't pass the discount onto others.
When you qualify for an X-plan, you provide Ford with your SS number as ID, and get an unique PIN to use at the dealer. With these plans, you agreed to a set of rules, and if you violate any of those rules, you have also agreed to things like having to fully reimburse Ford full price and all costs, and are permanently bared from ever participating again. So, be careful.