Originally Posted by
mahasamatman
Are you trying to book a stopover in Toronto? If so, UA would not be allowed to sell the YYZ-YYT segment (even if operated by AC) due to cabotage laws.
That… isn’t true. It is
possible that it couldn’t be purchased with YYZ-YYT UA codes, but even then I doubt it. Alaska cruises that depart Vancouver are allowed to transport people from a stopover in Juneau to a stop in Anchorage.
It definitely isn’t true with AC codes; anyone can go in and buy a domestic AC flight with MileagePlus miles with no cabotage issues at all.
UA is acting as an agent for AC, and AC can operate the flight legally.