Originally Posted by
PlatinumScum
I don't believe that it's legal for AA to sell you a ticket between US destinations that connects in Canada, so I don't believe this will ever be ticketed. Even if it is, it's almost certainly queued for manual review.
This is perfectly legal, even on a single ticket and there is no reason that this would cause a manual review.
You may be referring to US and Canadian laws and rules --- commonly referred to as "cabotage" --- which prohibit a foreign carrier from transporting passengers between two points in another country.
But, OP is booking AA to fly US-CANADA-US (even if on one ticket). AA is a US carrier and thus there is no violation. It would be illegal for AC to issue the same ticket. Or, it would be illegal for AA to issue a ticket for travel CANADA-US-CANADA/