I bought a ticket SEA-IAD-JFK-IAD-SEA on April 1. The outbound booked in K and the return in T. The next day, Ms. SeattleFed bought her ticket--same outbound flights but her return is the next week from BOS. Her outbound booked in T and her return in L. My ticket was $331; hers was $371.
I am a 1K MM; she is 1K courtesy of my status.
Today, at the opening of the 96-hour 1K window, she received an upgrade on SEA-IAD. I did not.
I assume that this is because her outbound was in T while mine was in K. If this is correct, it is ridiculous.