Originally Posted by
ajnz
Indeed. I once had a full Y fare WLG-MEL* that cost me NZD40 to upgrade to business class at the airport ticketing counter. The ticketing agents were rather surprised to see someone with an actual full Y fare, and even waived the $100 ticket re-issue fee.
Interesting. Have normally found the Corp discounts only apply to Y fares and not, I/J, and the difference is way more than you can discern from the website.