Do not confuse the concierges at the SE desk with the airport onsite concierges.
My understanding is that the concierges on the SE desk are a completely outsourced group providing general travel support services to SE members.
The at airport concierges are uniformed AC employees.
While the mandate of the two groups overlap to a certain extent I think their field of expertise is vastly different.
This is my understanding - please correct me if I'm wrong.