3823024 - Why is Oakland (OAK) not included as a "Sister Location" for San Francisco (SFO)?

Why is Oakland (OAK) airport not appearing as a sister location for San Francisco (SFO) in flight searches, while other nearby airports like Norman Y. Mineta San Jose International Airport (SJC) are included?

This article explains why Oakland (OAK) is not treated as a sister location for San Francisco (SFO) in flight searches conducted through SAP Concur. It highlights that SAP Concur reflects the configurations provided by the Sabre GDS system, where Oakland is not listed as a sister location for San Francisco. , KBA , CON-CA , Cross Applications , CON-SRV-TRV-ADM-LAN , View Airlines , Problem