Originally Posted by
bennyblanco
Thanks for the clarification. I used AwardNexus last night using Star Alliance UA search. The trip I was looking for came up and there were multiple options with different point values, etc. I assume this is the United Mileage program. So do I assume that AC just doesn't have reward space on these flights?
Pretty much every reward program has access to greater availability on its home airline than other airlines do. United MileagePlus has more access to seats on UA than Aeroplan does, and Aeroplan has access to more seats on AC than UA MP does.
It used to be that if the United website (or, presumably, something that was pulling from it) showed space at the Saver level, it should be bookable from another *A program, but I don't know whether that's still true.