Originally Posted by
MSPeconomist
Can you use a GUC? Or upgrade with miles, although that requires a relatively high fare class for an empty flight.
Using 2 GUCS for my LAX-NRT-BKK trip in January and the other 2 on a trip (on the return) in May taking my mom to Paris. So I'm out for 2016. LoL
I try to fly KLM for international because they offer paid upgrades for a very generous price if there are empty seats. I couldn't pass up the $600RT Y fares to Europe/Asia DL has offered this year and bought 7 trips. (NRT, HKG, ATH, CDG, AMS, BKK, BUD).

So I can't upgrade with miles.