Business to F/R Upgrades
I am scheduled to fly LAX-NRT, stopover, NRT-SIN on the A380 and 77W in J. I am not very familiar with SQ policies...are cash upgrades generally available at the airport? I am taking the SIN-LAX nonstop on the way back and for some reason was unable to combine F/R LAX-NRT-SIN with J SIN-LAX on the way back in, otherwise I would have booked it as I had preferred to fly it.