Originally Posted by
global_happy_traveller
Most UA/US 2 class domestic are First/Economy redemption for other *A carrier. This is because UA/US pegs the business class into O Class (first) instead of I Class (business).
well not quite - Aeroplan CHOOSES to charge First class mileage. They can easily charge business for domestic O tickets. They have in the past, and CO/UA charge those as business even though they may be O bucket.