I'm trying to book a business class award seat from Japan to Toronto, and although I secured a business class from NRT to BOS, AA is saying there's no business class to BOS to YYZ. I would need to pay the business class equivalent miles since NRT to BOS is business.
I then tried looking up available business class from BOS to YYZ, and I'm seeing a number of flights where the business award is available. Is there any reason why they would not offer BOS to YYZ in business class if they're part of NRT to YYZ, despite BOS to YYZ business is available if they're booked separately?