I was on Aircanada.ca pricing out a trip to South America and had something weird come up. It certainly is a strange system compared to most of the others

YYZ-GRU or EZE: priced at an H fare, refundable CAD $1800 or so

ORD-YYZ-GRU the transborder priced at a Q fare, the overseas at an H, around CAD $2000, NONREFUNDABLE

ORD-YYZ-EZE--apparently not available

any idea how to get this to work?
does AC publish an ATL-YYZ-South America fare?

jl