Originally Posted by
ulyparis
In many instances this does not work, e.g. YUL-BKK BKK-YUL
Does not work if some segments are entirely outside Canada.
Has been like that since one of the early "enhancements" of aircanada.com. Back in the old days, aircanada.com worked like any on line TA. Then they downgraded it so as only to offer AC flights and codeshares.