3500 miles for aircraft swap putting me in a middle seat from a window.

Didn't mind this, my frustration was that it was a domestic flight with intl EC and after the GA processed 8 gate upgrades for 3 DMs + 5 PMs, she gave the newly available EC aisle and window seats to non-status pax without seat assignments. I mentioned to her that those should be given to elites in the back who didn't clear upgrades and wrote in to DL to ask what the protocol is, especially given that domestic EC is coming soon.