SWU Upgrade cleared on over-water part. Can I apply it to other part of the itin?
I'm flying SFO-SEA//SEA-IAD-LHR.
IAD-LHR cleared. Can I apply the same SWU to SEA-IAD without losing IAD-LHR?
I'm already within my UDU window. What effect will applying the SWU (if it's possible) have, compared to UDU?