US has the same access to the *A flights as other partners.
Technically US has an access to LH F, but USDM does not want to issue it. US also does not issue RJ award for reasons we don't know.
As long as US pays, why do you think it should have a limited access to *A awards?
The inconsistency in searching *A awards using USDM results from incompetent USDM agents who don't know how to navigate the tools and who have little knowledge of *A award rules.