Originally Posted by
YVR72
...
Would be nice if they told you that when you booked the fare online - even a clickable "Special Internet Fare" flag that tells you what the restrictions are.
Pretty clear (section 3 "Review the rules and conditions and check box to continue") on ac.com when booking:
"Lower Latitude fares may be available only at aircanada.com for selected flights and dates. Any changes not completed on aircanada.com may result in a higher Latitude fare than would otherwise be available"