I booked a cheap return flight NRT-ICN and signed up to Skypass. I did not realise online seat selection closes 48 hours before departure, so I showed up at the airport and requested an aisle seat. Turns out when I got to the aircraft that it was business class! So I got a nice upgrade by not selecting online in advance lol
Also during check in, I requested my miles get posted to Delta, who I signed up with just specifically for this flight, as it seems easier to keep miles alive with Delta instead of KE, which is important as I am on a Oneworld explorer and post to AA mainly.