First time actually using the auto upgrade function and I have a question that I hope someone will be able to answer. Currently stuck in Y on the BKK-DXB-CPT (13/07) sector. Not going to spend the miles ( open for upgrade using miles) on the BKK-DXB sector as I'm wanting the DXB-CPT ideally. Does the auto upgrade function only last until online check in or is it more when i actually show up at the airport/ boarding gate.

Got a feeling EK waiting until the last minute so they don't have to fork out a CD reservation for me, wish they would just open seats up for upgrade for J as there is plenty of seats and Y oversold as well it looks ....