Not the carriers fault but similarly disorientating for the pax....
... an inexperienced travel agent booked a flight for a Couple to Sydney. Not a bad fare...approx £750 with Air Canada - which for most agents would surely ring an alarm bell.
Anyway the couple like the price, bought the ticket and after their connection in Canada arrived in Sydney.......Nova Scotia!
YQY = Sydney Canada
SYD - Sydney Australia