Originally Posted by D582

A long, long time ago when AC first launched its website, this was possible. Then they stopped it. In the more recent past this was possible by sending certain URLs to AC's old website, but they also stopped that.

The new Aeroplan programme will bring booking Aeroplan tickets to the main AC website, so the engine would certainly be capable of booking these itineraries, but that doesn't mean they will allow it for revenue tickets.

There is little to no incentive to AC for allowing you to book a revenue ticket that doesn't contain any flights marketed or operated by AC. It is a money losing transaction for AC as they are paying the credit card processing, they are the ones that have to handle customer service, they are the ones that have to pay the other airline when you fly and they are the ones that have to collect and remit the taxes. But they get no direct revenue out of it.