Originally Posted by
tashi
Coming back, was flying MKE-ORD-SAN and had 1K desk drop my MKE-ORD segment. Upon OLCI found option ORD-EWR-SAN and took it.
I think you got very lucky, because I don't think they are supposed to let you do this in order to protect fare integrity. Perhaps the IRROPS the day before enabled it. Otherwise, I don't think you can usually get this, just like you usually cannot get a co-terminal changed at origination (much easier as destination since you are at the airport, and airpor agents have more flexibility than phone agents)