That is, when you create D, you can link D to A, B, or C, but not A and B. This grants bonus AP to A,B, or C. Likewise, if you rebirth A, you can link A to another character (I have not rebirthed with a Hero talent since, so this is an assumption).
Flagship was one of the first of the traditional merchant account providers to offer free account setup, with no application or account setup fees being charged. The company was also among the first to offer true month-to-month contracts, with no early termination fees for closing your account.
The two largest operating companies are FedEx Express (the flagship operating company and the one with the most global recognition) and FedEx Ground. FedEx Express is best know for delivering packages quickly (overnight service being the its flagship service) which often employs airplanes to carry out part of the route. While overnight services are the flagship services in the US, FedEx also offers two day and three day service. The 3 day service is generally the least expensive service and is called Express Saver service.