Hi - I wonder what my options are. Due to insanely full airplanes, I had to buy a full fare refundable economy ticket that was extremely dear, ( business was even more) , I wondered what my options are to bump this up to business.

The route in question in SYD-SIN, over the first week of January.

QF is selling only full fare J and Y on the date in question. I purchased a full fare Y ticket.

Hold emerald status via BA if that matters. Does Qantas do cash upgrades at the airport?